CN120801888B - A method for monitoring the operating status of a laser emitter - Google Patents
A method for monitoring the operating status of a laser emitterInfo
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- CN120801888B CN120801888B CN202511317204.2A CN202511317204A CN120801888B CN 120801888 B CN120801888 B CN 120801888B CN 202511317204 A CN202511317204 A CN 202511317204A CN 120801888 B CN120801888 B CN 120801888B
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Abstract
本发明涉及数据处理技术领域，具体涉及一种激光发射器运行状态的监测方法，该方法包括：获取激光发射器的多维参数，根据激光发射器在当前时刻的电压和电流各自的变化量和变化速率，确定激光发射器在当前时刻的瞬时异常指标，将激光发射器在当前时刻的电光转换效率的相对下降程度和废热的相对增加程度之和确定为激光发射器在当前时刻的性能衰退指标；将激光发射器的性能衰退指标和激光发射器在当前时刻的瞬时异常指标的乘积确定为激光发射器在当前时刻的健康度指标，根据健康度指标和预设的健康度指标阈值的比较结果实时监测激光发射器的运行状态。该方法提高了激光发射器的运行状态监测的准确性。
This invention relates to the field of data processing technology, specifically to a method for monitoring the operating status of a laser transmitter. The method includes: acquiring multi-dimensional parameters of the laser transmitter; determining instantaneous anomaly indicators of the laser transmitter at the current moment based on the changes and rates of change of the voltage and current of the laser transmitter; determining the sum of the relative decrease in the electro-optical conversion efficiency and the relative increase in waste heat of the laser transmitter at the current moment as a performance degradation indicator of the laser transmitter at the current moment; determining the product of the performance degradation indicator and the instantaneous anomaly indicator of the laser transmitter at the current moment as a health indicator of the laser transmitter at the current moment; and monitoring the operating status of the laser transmitter in real time based on the comparison result of the health indicator and a preset health indicator threshold. This method improves the accuracy of monitoring the operating status of the laser transmitter.
Description
Technical Field
The invention relates to the technical field of data processing. In particular to a method for monitoring the operation state of a laser transmitter.
Background
The laser transmitter has general application in the fields of industrial processing, medical equipment, scientific research experiments and the like, and monitors the running state of the laser transmitter so as to ensure stable running of the laser transmitter. At present, the monitoring of the operation state of the laser transmitter mainly depends on the monitoring of the output power of the laser transmitter, namely, the output power of the laser transmitter is acquired in real time, and the output power is compared with a preset power threshold value, so that whether the operation state of the laser transmitter is normal or not is judged, and the operation state monitoring of the laser transmitter is realized.
However, there are limitations to this way of monitoring based on output power. Because the core performance of the laser transmitter is determined by the electro-optic conversion efficiency, in the long-term operation process of the laser transmitter, factors such as aging of internal components, light path pollution, temperature drift and the like can cause small reduction of the electro-optic conversion efficiency, and waste heat is increased. Meanwhile, as the laser transmitter is commonly provided with a closed-loop power control system, the closed-loop power control system can compensate the influence caused by the reduction of the electro-optic conversion efficiency by dynamically adjusting parameters such as driving current, voltage and the like, thereby maintaining the stability of output power. Therefore, in the early failure stage, the output power tends to be kept in a normal range, and the existing monitoring method which only depends on the output power cannot find potential failure hidden danger, so that hysteresis exists in monitoring.
More critical, the concealment of early failures can lead to a constant accumulation of risk. When the electro-optic conversion efficiency continues to drop, the driving system needs to continuously increase current and voltage to maintain the output power, which further aggravates the aging speed of components and the waste heat generation amount, and forms a vicious circle from the drop of the efficiency to the increase of the energy consumption and then to the aggravation of overheat, so that the efficiency further drops, and when the output power finally obviously abnormal, the laser emitter often approaches to a serious fault state.
Therefore, a method capable of identifying early physical changes such as small decrease of the electro-optical conversion efficiency and increase of waste heat is needed, so that the monitoring result of the operation state of the laser transmitter is more accurate and reliable.
Disclosure of Invention
The invention provides a method for monitoring the operation state of a laser transmitter, which aims to solve the problems that the prior monitoring method depends on early failure early warning lag caused by the output power of the laser transmitter and cannot identify early physical changes such as tiny decrease of the electro-optic conversion efficiency, increase of waste heat and the like. Comprising the following steps:
The method comprises the steps of obtaining voltage, current, reference driving power, actual driving power and reference heat dissipation power of a laser transmitter at each moment in the operation process, and setting any moment as the current moment;
Determining an instantaneous abnormality index of the laser transmitter at the current moment according to the respective variation and variation rate of the voltage and the current of the laser transmitter at the current moment, wherein the respective variation and variation rate of the voltage and the current are set as a forward quantization index of the instantaneous abnormality index;
Determining the sum of the relative reduction degree of the electro-optic conversion efficiency of the laser transmitter at the current moment and the relative increase degree of the waste heat as a performance degradation index of the laser transmitter at the current moment, wherein the relative reduction degree of the electro-optic conversion efficiency is determined based on the ratio of the reduction degree of the electro-optic conversion efficiency to the reference electro-optic conversion efficiency;
And determining the product of the performance degradation index of the laser transmitter and the instantaneous abnormality index of the laser transmitter at the current moment as the health index of the laser transmitter at the current moment, and determining the running state of the laser transmitter according to the comparison result of the health index and the preset health index threshold value so as to realize real-time monitoring of the laser transmitter.
According to the technical scheme, real-time electric parameters such as voltage, current and the like and reference power parameters are collected, and the parameters are directly related to the electro-optical conversion process of the laser transmitter, so that the method is a basis for capturing performance change of the laser transmitter. And the instantaneous abnormal index is determined based on the variation quantity and the variation rate of the voltage and the current, so that the static difference of the parameter deviating from the health reference is reflected, the dynamic risk of the variation trend is reflected, and the two are taken as the forward quantification index, so that the abnormal condition that the larger the deviation from the health state is and the faster the variation is can be accurately amplified, and the physical characteristics of the initial stage of the circuit system fault are met. And the relative reduction degree of the electro-optic conversion efficiency and the relative increase degree of the waste heat are accumulated to obtain a performance degradation index, the performance degradation index quantifies the degradation proportion of the electro-optic conversion core capacity, the relative increase of the energy loss is reflected by the electro-optic conversion core capacity, and the product of the electro-optic conversion core capacity and the waste heat is divided into two dimensions of effective conversion capacity degradation and ineffective loss aggravation, so that the nature of performance degradation of the laser transmitter is cooperatively depicted. Finally, the health state of the laser transmitter is comprehensively estimated by integrating the long-term performance degradation trend of the laser transmitter and the current instantaneous abnormal risk, so that the transition from normal operation to abnormal state of the laser transmitter can be accurately identified, the traditional hysteresis of monitoring only depending on output power is avoided, the real-time early warning of early faults is realized, and the monitoring accuracy is improved.
Preferably, the reference driving power is determined based on the following manner:
The method comprises the steps of collecting voltage, current, ambient temperature, internal temperature and set power of a laser transmitter at each moment in the running process of a healthy state in advance, taking the voltage/current as a dependent variable, taking the ambient temperature, the internal temperature and the set power as independent variables, determining a functional relation between the voltage/current, the ambient temperature, the internal temperature and the set power through data fitting operation to obtain a prediction model of reference voltage/reference current, wherein the prediction model of the reference voltage/reference current is used for predicting the reference voltage/reference current at each moment according to the ambient temperature, the internal temperature and the set power at each moment, and taking the product of the reference voltage and the reference current at each moment as the reference driving power at the moment.
Preferably, the reference heat dissipation power is determined based on the following manner:
the reference driving power of the laser emitter at each moment is subtracted by the set power of the laser emitter at the moment to obtain a value which is taken as the reference heat dissipation power of the laser emitter at the moment.
Preferably, the instantaneous abnormality index at the present time is determined based on the following manner:
the method comprises the steps of respectively carrying out standardization processing on the change quantity of voltage/current and the change rate of voltage/current of a laser transmitter at the current moment, multiplying the standardized change quantity of voltage/current and the standardized change rate of voltage/current to form a voltage/current dynamic risk item, and taking the sum of the voltage dynamic risk item and the current dynamic risk item as an instantaneous abnormality index at the current moment.
According to the technical scheme, through standardized processing of the variation quantity and the variation rate of the voltage/current, interference of different parameter magnitude differences is eliminated, the variation quantity and the variation rate have comparability and additivity, abnormal risks can be reflected on the same dimension by the variation quantity and the variation rate, a dynamic risk item is constructed by multiplying the standardized variation quantity and the variation rate, physical logic with higher risks when deviation is larger and variation is quicker is reserved, and the difference of abnormal signals relative to normal fluctuation is amplified through standardization, so that potential risks of small deviation but rapid variation or obvious deviation but slow variation can be reasonably quantized, and instantaneous abnormality generated in the operation process of the laser transmitter can be reflected more comprehensively.
Preferably, the magnitude of the decrease in the electro-optical conversion efficiency and the reference electro-optical conversion efficiency are determined based on the following manner:
The method comprises the steps of taking the ratio of the set power of a laser transmitter at the current moment to the reference driving power at the current moment as the reference electro-optic conversion efficiency at the current moment, taking the ratio of the set power of the laser transmitter at the current moment to the actual driving power at the current moment as the actual electro-optic conversion efficiency at the current moment, and taking the difference between the reference electro-optic conversion efficiency at the current moment and the actual electro-optic conversion efficiency as the descending amplitude of the electro-optic conversion rate.
According to the technical scheme, the characteristic of performance degradation of the laser transmitter is accurately quantified from the angle of energy conversion, the attenuation degree of the electro-optic conversion capability of the laser transmitter at the current moment relative to the electro-optic conversion capability of the laser transmitter in the healthy state is accurately quantified by analyzing the difference between the ideal electro-optic conversion efficiency in the healthy state and the actual electro-optic conversion efficiency at the current moment, and the sensitivity to the early-stage efficiency tiny drop faults of the laser transmitter is enhanced.
Preferably, the waste heat increment is determined based on the following:
The method comprises the steps of taking the difference value between actual driving power of a laser transmitter at the current moment and reference driving power at the current moment as a driving power increment, taking the product of the set power of the laser transmitter at the current moment and the relative reduction degree of the electro-optic conversion efficiency of the laser transmitter at the current moment as compensation driving power, wherein the compensation driving power is used for reflecting the driving power which is required to be additionally input by a power control system of the laser transmitter for compensating the light energy loss caused by the reduction of the electro-optic conversion efficiency, and subtracting the compensation driving power from the driving power increment to obtain a waste heat increment.
According to the technical scheme, from the angle of energy conservation, the waste heat increment and the reduction of the electro-optic conversion efficiency form strict quantitative correspondence, so that the physical rule of 'waste heat increment caused by the reduction of the electro-optic conversion efficiency' is met, accurate basic data is provided for the subsequent calculation of a relative waste heat increment term, and the identification capability of early tiny waste heat change is enhanced.
Preferably, the amount and rate of change of the voltage and current, respectively, of the laser transmitter at the present time is determined based on:
The method comprises the steps of taking the difference between the voltage/current of a laser transmitter at the current moment and the reference voltage/reference current at the current moment as the variation of the voltage/current at the current moment, taking the difference between the voltage/current of the laser transmitter at the previous moment and the reference voltage/reference current at the previous moment as the variation of the voltage/current at the previous moment, subtracting the variation of the voltage/current at the previous moment from the variation of the voltage/current of the laser transmitter at the current moment, dividing by the time interval between the current moment and the previous moment, and taking the time interval as the variation rate of the voltage/current at the current moment.
Preferably, after determining the sum of the relative decrease degree of the electro-optic conversion efficiency of the laser emitter at the current moment and the relative increase degree of the waste heat as the performance degradation index of the laser emitter at the current moment, the performance degradation index is further corrected by analyzing the aging trend, wherein the method comprises the steps of quantifying the aging coefficient of the laser emitter according to the ratio of the running time of the laser emitter to the design life of the laser emitter, quantifying the performance degradation component generated by the aging trend according to the product of the aging coefficient and the performance degradation index, and removing the performance degradation component generated by the aging trend from the performance degradation index of the laser emitter at the current moment to obtain the performance degradation index corrected at the current moment.
According to the technical scheme, the performance degradation index is corrected by analyzing the aging trend, so that the accuracy and pertinence of state monitoring of the laser transmitter are effectively improved, the influence of the normal aging trend on the performance degradation index is proposed, the corrected performance degradation index more purely reflects abnormal performance degradation, the misjudgment of normal aging as a fault is avoided, and the monitoring system can accurately identify the performance degradation. Not only accords with the natural aging rule of the long-term operation of the laser transmitter, but also strengthens the sensitivity to early abnormal faults and can accurately reflect the real operation state.
Preferably, the laser transmitter is standardized in terms of the amount of change in voltage/current and the rate of change in voltage/current at the present time, respectively, by taking the ratio of the amount of change in voltage/current at the present time to the reference voltage/reference current at the present time as the standardized amount of change in voltage/current and the ratio of the rate of change in voltage/current at the present time to the standard deviation of the rate of change in voltage/current at the historical time as the standardized rate of change in voltage/current.
Preferably, the method for determining the operation state of the laser transmitter according to the comparison result of the health index and the preset health index threshold value comprises the following steps:
If the health index of the laser transmitter at the current moment is larger than or equal to a preset health index threshold, the laser transmitter is judged to be abnormal in operation at the current moment, and if the health index of the laser transmitter at the current moment is smaller than the preset health index threshold, the laser transmitter is judged to be normal in operation at the current moment.
The invention has the following effects:
according to the scheme, the instantaneous dynamic risk is captured by analyzing the instantaneous abnormal indexes of the laser transmitter at each moment, the long-term performance attenuation characteristic of the laser transmitter is reflected by the performance degradation indexes, whether the laser transmitter is in a healthy running state or not is evaluated by fusing the long-term performance attenuation characteristic and the instantaneous dynamic risk, normal fluctuation and natural aging interference can be effectively removed through aging trend analysis, early physical changes such as tiny reduction of the electro-optical conversion efficiency and waste heat increase can be identified, hysteresis of monitoring only depending on output power in the prior art is avoided, and accuracy and reliability of monitoring the running state of the laser transmitter are improved.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a method for monitoring the running state of a laser transmitter, as shown in figure 1, comprising the following steps:
s1, acquiring multidimensional parameters of the laser transmitter at each moment in the operation process.
The method is characterized in that multidimensional parameters at each moment in the operation process of the laser transmitter are collected, the multidimensional parameters comprise voltage, current, reference driving power, actual driving power and reference heat dissipation power, the operation state of the laser transmitter is completely described from multiple dimensions such as electric energy input, optical energy output and energy conversion, and comprehensive data bases are provided for identifying early faults of the laser transmitter through collaborative analysis of the multidimensional parameters.
In order to accurately monitor the running state of the laser transmitter, a reference prediction model is constructed in advance to acquire reference voltages and reference currents at all times, wherein the reference values are ideal parameters corresponding to the set power for maintaining the set power in a healthy state of the equipment, and the ideal parameters not only define parameter fluctuation boundaries in normal running, but also provide quantitative references for abnormality judgment of actual parameters.
The reference prediction model can filter environmental interference (such as parameter drift caused by temperature change) to lead the deviation of actual voltage, current and a reference value to precisely point to performance decline, and simultaneously, the variation quantity and the variation rate calculated based on the reference value can be directly used for quantifying instantaneous abnormal indexes, thereby ensuring the capturing capability of early fault signals such as tiny deviation and rapid deterioration, and fundamentally solving the problem that parameter fluctuation is difficult to define when no reference standard exists.
In one embodiment, the reference prediction model includes a reference current prediction model and a reference voltage prediction model for acquiring a reference current and a reference voltage at each time, respectively, and the reference driving power at each time can be determined from the reference current and the reference voltage at that time.
Specifically, the method comprises the following steps:
a current sensor and a voltage sensor with the precision of 16 bits and above are selected and used for collecting current and voltage in a power closed-loop control system of a laser transmitter respectively, and the sampling frequency of the sensor is set to be 1kHz so as to ensure that tiny parameter fluctuation can be captured. The selection precision is as follows The temperature sensor of (2) respectively collects the ambient temperature and the internal temperature of the laser transmitter.
The temperature sensor is arranged at the position of the laser transmitter shell close to the core heating component and the representative position of the environment where the laser transmitter is positioned, all sensors are connected with the data acquisition card, and the data acquisition card is connected with the computer through an interface, so that real-time data transmission and storage are realized.
Starting a laser emitter, starting to acquire data in real time to form a data sequence containing current, voltage, ambient temperature and internal temperature, synchronously acquiring set power from a power control system of the laser emitter, automatically fitting a functional relation between voltage and ambient temperature, internal temperature and set power and a functional relation between current and ambient temperature, internal temperature and set power by adopting a multiple linear regression method after acquiring all data of 24 hours, and respectively obtaining a reference voltage prediction model and a reference current prediction model according to the two fitted functional relations, wherein the reference voltage prediction model and the reference current prediction model are respectively used for predicting current and voltage which a healthy laser emitter should have under any temperature condition (ambient temperature and internal temperature) and set power condition, namely the reference current and the reference voltage.
The reference current prediction model is as follows:
;
In the formula (i), Is thatReference current (model predictive value) at the moment of time, which isSetting power of timeAnd the theoretical current value of a healthy laser emitter under the temperature condition,The constant intercept term represents the basic quiescent current consumption of the laser transmitter at the set power of 0 and the reference temperature, namely the minimum current generated by the laser transmitter itself due to circuit standby, basic element power consumption and the like when the laser transmitter does not output laser power and the ambient temperature is at the reference temperature.AndThe average value of all the ambient temperatures and the average value of all the internal temperatures acquired within 24 hours are used as reference base points for calculating the temperature difference. Wherein the temperature condition is thatAndThe method is characterized in that the method comprises the following steps of jointly determining,Is thatThe ambient temperature at the moment in time,Is thatThe internal temperature of the moment in time,Is a currentThe coefficient of influence on the set power is,Is the coefficient of the temperature of the environment,Is the internal temperature coefficient.
In the formula (i),Part is a power influence term reflecting the current of each unit increase of the set powerThe normal increment to which there should be is,Partly an ambient temperature influencing term, which is used to compensate for fluctuations in current caused by ambient temperature changes,And part of the internal temperature influence term is used for compensating the normal influence of the thermal state change of the laser transmitter on the current.
The reference current prediction model is to fully cover several major factors (output tasks, external environment, internal thermal state) affecting the driving current. The method can accurately separate the fluctuation caused by normal working conditions and environmental changes from complex actual measured current values, and lays a foundation for the follow-up identification of real abnormality.
The reference voltage prediction model is as follows:
;
In the formula (i), Is thatReference voltage (model predictive value) at time instant, which isSetting power of timeAnd under the temperature condition (fromAndTogether), a healthy laser transmitter theoretical voltage value,The constant intercept term, represents the base quiescent voltage of the laser transmitter at a set power of 0 at a reference temperature,AndThe average value of all the ambient temperatures and the average value of all the internal temperatures acquired within 24 hours are taken as reference base points for calculating the temperature difference,Is thatThe ambient temperature at the moment in time,Is thatThe internal temperature of the moment in time,Is the voltageThe coefficient of influence on the set power is,Is the coefficient of the temperature of the environment,Is the internal temperature coefficient.
In the formula (i),Part is a power influence term reflecting the voltage of each unit of increase of the set powerNormal increments should be made.In part, an ambient temperature influence term that compensates for fluctuations in voltage due to ambient temperature changes.And part of the internal temperature influence term is used for compensating the normal influence of the thermal state change of the laser transmitter on the voltage.
The reference voltage prediction model is to fully cover several major factors (output tasks, external environment, internal thermal state) affecting the voltage. The method can accurately separate the fluctuation caused by normal working conditions and environmental changes from complex actual measurement voltage values, and lays a foundation for the follow-up identification of real abnormality.
Further, the coefficients in the reference current prediction model and the reference voltage prediction model are obtained by automatically solving from health state data acquired in 24 hours through a linear fitting method of multiple linear regression. Taking a reference current prediction model as an example, the core of the method is to take current as a dependent variable, set power, environment temperature difference and internal temperature difference as independent variables, construct a linear regression equation, and correspond to a group of independent variable data and dependent variable data at each moment in a 24-hour health data sequence. The nature of the linear fitting process is to calculate a set of coefficients by an algorithmThe error between the reference current predicted from the equation and the actual current collected is minimized (typically, a least square method is used to minimize the sum of the squares of the errors of the currents at all times).
For example, it willSubstituting a linear regression equation to makeAnd iterating and optimizing the coefficient value through a linear regression algorithm until the fitting effect of the equation on all data is optimal, wherein the obtained coefficient is the finally adopted parameter of the model. And the association rule of the current in the healthy state and each influence factor is quantized into a specific coefficient by a mathematical method, so that the model can accurately reflect the parameter characteristics of the healthy laser transmitter.
Similarly, the coefficient of the reference voltage prediction model is obtained by solving the health data based on the voltage and each influence factor by the same multiple linear regression fitting method.
After the reference prediction model learning is completed, the reference value is dynamically adaptive, and whenThe reference current at the time can be predicted according to the reference current prediction modelPredicting the reference voltage at the time based on the reference voltage prediction modelReference drive power at that timeReference heat radiation power at this time。
In the operation process of the laser transmitter, according to the law of conservation of energy and the physical working principle of the laser transmitter, the energy conversion process of the laser transmitter follows the law of 'input electric energy (driving power) +output light energy (setting power) +heat dissipation loss (reference heat dissipation power'). In reality, the electro-optical conversion efficiency cannot reach 100% (inherent losses such as circuit loss, optical path loss, component heating and the like exist), the input reference driving power (electric energy) is larger than the output set power (optical energy), and the difference value of the input reference driving power and the output set power (optical energy) is the reference heat dissipation power (dissipated in a heat energy form).
The reference driving power is theoretical electric energy input power fitted by a dynamic reference prediction model based on parameters such as set power, ambient temperature, internal temperature and the like of the laser transmitter in a healthy state, and represents standard energy consumption for maintaining set power output in the healthy state.
The actual driving power is the electric energy input power acquired in real time in the monitoring process and is equal to the product of the actual voltage and the actual current at the current moment, and reflects the actual energy consumption of the laser transmitter in the operation process.
The set power is set by a user according to the output requirement of the laser transmitter, namely the light energy output by the laser transmitter is expected, and the set power is an optical power index which needs to be achieved when the laser transmitter operates, does not relate to the input of electric energy, and is only related to the output light energy.
The reference heat dissipation power is a part of the reference driving power which is not converted into the set power due to inherent loss of photoelectric conversion when the laser emitter is in a healthy state, and is equal to the reference driving power minus the set power. The reference heat dissipation power can be emitted in the form of heat, reflects the heat dissipation condition of the laser transmitter due to energy conversion loss in a healthy state, and is a reference for measuring the normal heat dissipation level.
S2, evaluating instantaneous abnormality indexes of the laser transmitters.
In the operation process of the laser transmitter, the electro-optical conversion efficiency is reduced caused by early failure, and the reduction is converted into tiny abnormal fluctuation of parameters such as voltage, current and the like through a closed-loop control system, but the fluctuation is often covered by parameter fluctuation under normal working conditions. The instantaneous abnormal index can focus on the additional change of the parameter deviating from the health standard, and accurately identify potential risks such as 'tiny deviation but rapid deterioration' by quantifying the amplitude and the rate of the change, thereby providing real-time and dynamic quantification basis for early fault early warning and avoiding continuous accumulation of faults in a hidden state to form malignant cycle.
In one embodiment, the instantaneous anomaly index of the laser transmitter at the current moment is determined according to the respective change amounts and change rates of the voltage and the current of the laser transmitter at the current moment, and the respective change amounts and change rates of the voltage and the current are set as the forward quantization index of the instantaneous anomaly index.
First, a reference voltage and a reference current at each time are acquired by using a reference voltage prediction model and a reference current prediction model as references. The method comprises the steps of obtaining a change amount (calculated difference value and absolute value) of a voltage (actual voltage) at a current moment relative to a reference voltage at the moment as a first voltage change amount, obtaining a change amount of a current (actual current) at the current moment relative to the reference current at the moment as a first current change amount, obtaining a change amount of a voltage (actual voltage) at a previous moment relative to the reference voltage at the previous moment as a second voltage change amount, obtaining a change amount of a current at the previous moment relative to the reference current at the previous moment as a second current change amount, and reflecting static deviation degree of the voltage, the current relative to the reference voltage and the reference current.
Next, the difference between the first voltage variation and the second voltage variation is divided by the time interval (of the present time and the previous time), and the obtained value is used as the rate of change of the voltage at the present time. The difference between the first current variation and the second current variation is divided by the time interval (of the current time and the previous time), and the obtained value is used as the current variation rate of the current at the current time. The rate of change of voltage and the rate of change of current are used to reflect the dynamic bias trend.
Then, the first voltage change amount, the first current change amount, the change rate of the voltage at the present moment and the change rate of the current at the present moment are respectively normalized to eliminate the magnitude difference, and the method comprises the following steps:
taking the ratio of the first voltage variation to the reference voltage at the current moment as the normalized voltage variation; taking the ratio of the first current variation to the reference current at the current moment as the standardized current variation;
the ratio of the absolute value of the rate of change of the voltage at the present time to the standard deviation of the rate of change of the voltage at the history time (50 times before the present time, the empirical value) is taken as the normalized rate of change of the voltage. The ratio of the absolute value of the rate of change of the current at the present time to the standard deviation of the rate of change of the current at the history time (50 times before the present time, the empirical value) is taken as the normalized rate of change of the current.
Finally, multiplying the normalized first voltage variation and the voltage variation rate to form a voltage dynamic risk item, multiplying the normalized first current variation and the current variation rate to form a current dynamic risk item, and taking the sum of the voltage dynamic risk item and the current dynamic risk item as an instantaneous abnormality index at the current moment to realize sensitive capturing and accurate quantification of early-stage fading signals.
For example, the number of the cells to be processed,The instantaneous abnormality index at the moment is:
In the formula (i), Is thatThe instantaneous anomaly index of a moment is a dimensionless value.Is thatCurrent at time relative to its reference currentIs used for the control of the degree of variation of (c),Is thatThe voltage at the moment of time relative to its reference voltageIs a variable amount of (a).Is thatThe rate of change of the current at the moment in time,Is thatThe rate of change of the voltage at the moment in time,As a sign of the absolute value of the sign,For all of the historical momentsIs set in the standard deviation of (2),For all of the historical momentsRepresents the level of historical fluctuations.
In the formula (i),Is toIs a standardized process reflectingThe magnitude of the current at the moment deviates from the state of health,Is toIs a standardized process reflectingThe rate of change of current at time.Is thatThe current dynamic risk item at the moment realizes the logic of 'the larger the deviation from the health state, the faster the change rate, the higher the risk' through multiplication.
In the formula (i),Is toIs a standardized process reflectingThe magnitude of the voltage deviation from the healthy state at the moment in time,Is toIs a standardized process reflectingThe rate of change of voltage at time.Is thatThe voltage dynamic risk item at the moment realizes the logic of 'the larger the deviation from the health state, the faster the change rate, the higher the risk' through multiplication.
Finally, two dynamic risk items are integrated and added, and quantification is carried outThe instantaneous anomaly index at a moment reflects the instantaneous anomaly risk at that moment. In order to avoid calculation errors caused by extreme conditions, it is set here thatWhen the number of the organic light emitting diode is 0,Part is regarded as 1 in its entirety whenWhen the number of the organic light emitting diode is 0,The whole part is regarded as 1, and the instantaneous abnormality index is evaluated only according to the magnitude of the deviation from the healthy state. If it isIs 0, willPart taken as a whole as 0, ifIs 0, willThe whole part is considered as 0, and no transient abnormality risk is considered.
And S3, determining performance degradation indexes of the laser transmitter.
The instantaneous abnormal index at the current moment mainly reflects the parameter fluctuation condition at the current moment, can capture the instantaneous abnormality, but hardly reflects the accumulated effect of performance degradation, and the independent photoelectric conversion efficiency change only can quantitatively degrade the performance, and cannot be related to the cooperative relationship between the photoelectric conversion efficiency change and waste heat increase.
The performance degradation indexes of the step are combined with the dual dimensionalities of efficiency degradation and waste heat increase, so that the defect that the instantaneous indexes lack of a long-term visual angle is overcome, the problem that the single efficiency parameter is not fully reflected on the performance degradation is solved, the overall change trend of 'electric-optical conversion efficiency reduction, waste heat shock increase and performance acceleration degradation' of the laser transmitter can be reflected more systematically, comprehensive quantification basis for considering the performance degradation degree and deterioration influence is provided for the health evaluation of the laser transmitter, and the judgment on the long-term performance evolution is more scientific and comprehensive.
In one embodiment, the process of determining an indicator of performance degradation of a laser transmitter is as follows:
First, the degradation of laser transmitter performance is considered in two dimensions, the "drop in electrical to optical conversion efficiency" and the "increase in waste heat". From the physical mechanism of energy conversion of the laser transmitter, the reduction of the electro-optic conversion efficiency and the increase of waste heat are core characteristics which are related to each other but have emphasis in the performance degradation process of the laser transmitter, and the two core characteristics together form the complete dimension for measuring the degradation degree. Because the core function of the laser transmitter is to convert electric energy into light energy with high efficiency, the electro-optical conversion efficiency directly reflects the advantages and disadvantages of the core performance, and the decrease of the electro-optical conversion efficiency means that the light energy generated by unit electric energy is reduced, and the essence is the decay of the energy conversion capability and the characteristic of the performance decay. According to the law of conservation of energy, the electric energy which is not converted into light energy is dissipated in the form of waste heat, so that the efficiency reduction is inevitably accompanied by the waste heat increase, more importantly, the waste heat increase is not only the result of efficiency degradation, but also the aging of components is accelerated, the electro-optical conversion efficiency is further reduced, a vicious circle of 'the reduction of the electro-optical conversion efficiency, the waste heat surge and the further reduction of the efficiency' is formed, and the waste heat increase is a key index of performance degradation and trend degradation.
If only the reduction of the electro-optical conversion efficiency is concerned, the thermal hazard caused by the reduction of the electro-optical conversion efficiency and the influence on the system stability cannot be quantified, and if only the increase of the waste heat is monitored, the inevitable result caused by the efficiency degradation or the failure of the heat dissipation system itself is difficult to distinguish. Therefore, the step considers the two dimensions together, accords with the physical rule of energy conversion and fault evolution of the laser transmitter, and enables the performance degradation index to more comprehensively reflect the actual health state of the equipment.
Then, the relative degree of decrease in the electro-optical conversion efficiency of the laser emitter at the present time and the relative degree of increase in the waste heat are obtained.
For the degree of relative decrease in the electro-optic conversion efficiency:
In the operation process of the laser transmitter, the reference electro-optical conversion efficiency is in an ideal state, and the actual electro-optical conversion efficiency is usually lower than the reference electro-optical conversion efficiency, which is the necessary result of equipment aging and efficiency reduction, and accords with the normal fault evolution flow.
The ratio of the set power of the laser transmitter at the current moment and the reference driving power at the current moment is taken as the reference electro-optic conversion efficiency at the current moment, the ratio of the set power of the laser transmitter at the current moment and the actual driving power at the current moment is taken as the actual electro-optic conversion efficiency at the current moment, and the difference between the reference electro-optic conversion efficiency at the current moment and the actual electro-optic conversion efficiency is taken as the descending amplitude of the electro-optic conversion rate. The ratio of the decrease in the electro-optical conversion efficiency to the reference electro-optical conversion efficiency is taken as the relative decrease in the electro-optical conversion efficiency.
For example, the number of the cells to be processed,The voltage at the moment (actual voltage) isThe current (actual current) isThe reference voltage isThe reference current isThe reference driving power isSetting the power to。
Reference electro-optic conversion efficiency of time;
The actual electro-optic conversion efficiency at the moment is,Representation ofThe actual driving power at the moment;
Time-of-day degradation of the photoelectric conversion rate Will beAs a relative degree of decrease in the electro-optical conversion efficiency.
The relative reduction degree of the electro-optical conversion efficiency directly reflects the proportion of the degradation of the electro-optical conversion efficiency relative to an ideal state, is more attached to the nature of degradation of performance, for example, the relative reduction degree of the electro-optical conversion efficiency is 10%, which means that the electro-optical conversion efficiency at the current moment is only 90% of the health state, intuitively reflects the attenuation proportion of the core performance, has more close association with fault factors such as equipment aging, light path pollution and the like, and can effectively avoid the interference of the set power level on the electro-optical conversion efficiency (for example, the absolute efficiency value under the high set power may be lower, but the relative reduction degree can accurately reflect the degradation of the electro-optical conversion efficiency relative to the self reference).
Relative degree of increase for waste heat:
Taking the product of the set power of the laser transmitter at the current moment and the relative reduction degree of the electro-optic conversion efficiency of the laser transmitter at the current moment as compensation driving power, and taking the driving power which is required to be additionally input for compensating the light energy loss caused by the reduction of the electro-optic conversion efficiency by a power control system of the laser transmitter, subtracting the compensation driving power from the driving power increment to obtain waste heat increment. Waste heat increment is the waste heat power that is additionally generated by the decrease of the electro-optic conversion efficiency of the laser transmitter during the operation process. From the energy circulation perspective, when the electro-optic conversion efficiency is reduced, the actual driving power is increased (i.e. the driving power increment) compared with the reference driving power, and a part of the driving power increment is used for compensating the light energy loss caused by the reduction of the efficiency (i.e. compensating the driving power), and the rest part which cannot be converted into effective light energy is additionally dissipated in a heat energy form, and the part is the waste heat increment. The direct correlation between efficiency reduction and waste heat increase is accurately reflected, is different from the additional new part of inherent waste heat during normal operation of equipment, and reflects the additional heat load generated by the laser transmitter due to performance degradation.
The ratio of the increment of the waste heat to the reference heat radiation power is taken as the relative increment degree of the waste heat.
For example, the number of the cells to be processed,The drive power increment at the moment is:
In the formula (i), Is thatThe drive power increment at the moment in time,Representation ofThe actual driving power at the moment in time,Is thatThe reference drive power at the moment in time,Is thatThe voltage at the moment (actual voltage),Is thatCurrent at time (actual current).
The compensating driving power at the moment is;
The waste heat increment at the moment is;
The relative degree of increase in waste heat at the moment is, wherein,Is thatReference heat dissipation power at the moment.
From the physical process of energy conversion of the laser transmitter, the scheme defines and calculates the relative increase degree of waste heat, accurately captures the energy dissipation in the performance degradation process, and is specifically characterized in the following aspects:
from a physical essence, the energy flow of the laser emitter follows the energy conservation law of "input electric energy (driving power) =output light energy (setting power) +heat dissipation power". The reference heat dissipation power is an inherent part of the "energy difference between input and output" in the healthy state, and the waste heat increment is the "extra multi-dissipation non-efficient energy" after the efficiency is reduced. The relative increase in waste heat increment to reference heat dissipation power essentially reflects the ratio of "additional waste heat to" normal waste heat, "e.g., a relative increase of 20%, meaning that the current waste heat dissipates 20% more reference heat dissipation power than in the healthy state, directly quantifying the heat load aggravating effect caused by efficiency decay.
From the fault evolution logic, the index complements the relative decline in the electro-optic conversion efficiency, which reflects the decay proportion of the effective energy conversion capability, while the relative increase in waste heat reflects the "deterioration proportion of the ineffective energy dissipation". Both have causal association (efficiency reduction inevitably leads to waste heat increase) and can comprehensively reflect the synergistic effect of derivative hazard exacerbation. For example, when the efficiency is relatively reduced by 10% and the waste heat is relatively increased by 20%, the product result includes both the loss of energy conversion capability and the amplification effect of thermal hazard, and the physical rule of 'degradation of electro-optical conversion efficiency- & gt heat accumulation- & gt performance acceleration degradation' can be reflected more than a single index.
In terms of monitoring value, the scheme subtracts the compensation driving power from the driving power increment, so that the effective compensation energy consumption which is additionally input for maintaining the light energy output is stripped, only the waste heat which is purely and multiply dissipated due to efficiency reduction is reserved, the physical purity of the waste heat increment is ensured, and the waste heat increment is compared with the reference heat dissipation power, so that the index has the comparability of cross-equipment and cross-working conditions. The relative increase degree can reflect the deviation proportion of the thermal state relative to the health reference consistently no matter the power is low or high, a standardized quantification signal of thermal load deterioration is provided for early fault early warning, the limitation of the traditional monitoring output power only is effectively made up, and the capturing of the hidden energy dissipation abnormality is more accurate and prospective.
And finally, determining the sum of the relative reduction degree of the electro-optic conversion efficiency of the laser transmitter at the current moment and the relative increase degree of the waste heat as the performance degradation index of the laser transmitter at the current moment, accurately and comprehensively quantifying the performance degradation state of the laser transmitter, and integrating the synergistic effect of 'core capacity degradation' and 'derived hazard aggravation' of the laser transmitter at the current moment. The relative degree of decrease in the electro-optic conversion efficiency reflects the rate of decay of the energy conversion core performance, and the relative degree of increase in waste heat reflects the rate of deterioration of the non-efficient consumption, which together reflect the combined effect of "efficiency decay + waste heat increase".
For example, the number of the cells to be processed,Index of time of day performance decayThe method comprises the following steps:
In the formula (i), Is thatThe magnitude of the drop in the rate of electro-optic conversion at that time,Is thatThe reference electro-optical conversion efficiency at the time,Is thatThe drive power increment at the moment in time,Is thatThe set power of the moment in time is,Is thatThe reference heat dissipation power at the moment of time,To the extent of the relative decrease in the electro-optic conversion efficiency,Is a relative degree of increase in waste heat.
To ensure robustness of the calculation, whenOr (b)When the calculated result of (2) is 0, it is set to a very small positive number, for example, to。
And S4, analyzing the aging trend to dynamically correct the performance degradation index.
There is a slow, normal performance decay process for laser transmitters during long term use. In order to avoid misjudging such normal, predictable aging as a fault requiring immediate intervention, this step eliminates the effects of the normal aging trend, resulting in a final performance degradation indicator, thereby enabling the monitoring system to focus more on identifying those truly abnormal performance degradation.
The performance degradation index is an actual and measurable performance degradation degree calculated by real-time monitoring data (such as efficiency degradation and waste heat increase), is an objective index for describing the performance degradation situation of the laser transmitter, and is actually the superposition of two factors, namely, the first is a normal aging factor, namely, the natural, slow and predictable wear of components of the laser transmitter due to long-time operation, which is unavoidable. The second is an abnormal degradation factor, namely, nonlinear and accelerated performance degradation of the laser transmitter caused by specific reasons (such as potential defects, overload and environmental degradation), which are precursors of faults and are targets for real early warning. Thus, the performance degradation trend contained in the health index is a general trend including "normal aging" and "abnormal degradation".
The normal aging naturally reduces the electro-optic conversion efficiency and slowly increases the waste heat, and the numerical value of the performance degradation index is directly improved. If the ageing influences are not removed, the performance degradation index not only comprises the expected degradation of normal ageing, but also overlaps the possible abnormal fault risks, so that the performance degradation index is artificially increased, the normal ageing is easily misjudged as a fault requiring urgent treatment, and the maintenance resource waste is caused.
Therefore, the influence of normal aging is removed, and the performance degradation index is dynamically corrected, so that the corrected performance degradation index can accurately reflect unexpected risks except for normal aging, the subsequent health index is ensured to be not interfered by normal aging, and the high sensitivity to abnormal faults is maintained.
There are significant differences in the mechanism of action and manifestation of non-aging factors-induced performance decay from normal aging, for example the following:
Sudden hardware faults, such as damage to the junction region of the laser diode, can directly reduce the electro-optic conversion efficiency, force the actual driving power to increase to maintain the set power, lead to the increase of waste heat, push up the value of the performance degradation index, and increase the light path loss when the optical lens is polluted or displaced, so that unconverted energy is accumulated in the form of waste heat, and push up the value of the performance degradation index.
When the impact of extreme working conditions, such as sudden rise of the ambient temperature exceeds the normal range, the heat dissipation system cannot timely dissipate waste heat, so that the reduction of the electro-optical conversion efficiency is accelerated, a thermal runaway cycle is formed, and the increase of the non-efficient energy consumption (waste heat) increases the value of the performance degradation index.
The parameter calibration deviation of the power closed loop control system can lead the 'actual driving power increment' to be matched and unbalanced with the 'efficiency compensation driving power', so that the increment of waste heat is abnormally increased, and the value of the performance degradation index is improved.
In one embodiment, the method of analyzing the aging trend to dynamically correct the performance degradation indicator is:
the method comprises the steps of quantifying an aging coefficient of a laser transmitter according to the ratio of the running time of the laser transmitter to the design service life of the laser transmitter, quantifying a performance degradation component generated by an aging trend according to the product of the aging coefficient and the performance degradation index, and removing the performance degradation component generated by the aging trend from the performance degradation index of the laser transmitter at the current moment to obtain the performance degradation index of the laser transmitter after correction at the current moment.
For example, a laser emitter is arranged atThe performance degradation index at the moment is corrected according to the following formula:
In the formula (i), Is thatThe performance degradation index after the time correction,Is thatPerformance degradation index of the moment of time,The design life of the laser transmitter is the total time length of equipment which can stably run under the normal aging rate, and is obtained by statistics of actual data of manufacturers or the same batch,Is the total run time of the laser transmitter.Essentially reflecting the aging coefficient of the laser transmitter, the longer the run time, the higher the ratio, and the more significant the aging effect. When the laser transmitter is just operating,,Almost no correction, and meets the practical situation of little influence of new equipment aging, when the laser transmitter is close to the design life,,When the aging of the equipment reaches the limit, the performance decline index is close to 0, and in the middle process, along with the increase of the running time,The number of the cells to be processed is increased,The performance degradation index is reasonably reduced, the degradation caused by normal aging is reflected, and the misjudgment of the normal aging as a fault is avoided.
After the formula is developed,Partially quantifying performance degradation components generated by aging trend, and indicating performance degradation index of laser emitter at current momentRemoving (subtracting) performance degradation component generated by aging trend to obtain performance degradation index of laser transmitter after correction at current moment。
And S5, combining the instantaneous abnormal index and the performance decay index to determine the health index.
The method for quantifying the health index by combining the instantaneous abnormal index and the performance decay index is a core step for comprehensively and dynamically evaluating the health state of the laser emitter. The instantaneous abnormal index and the performance degradation index have complementarity and synergy in the monitoring dimension, wherein the instantaneous abnormal index focuses on the instantaneous stability of the operation of the laser transmitter, the current dynamic risk is reflected by the sudden fluctuation of the sensitive capturing parameters through the variation quantity and the variation rate of voltage and current, the performance degradation index focuses on the long-term performance degradation trend, and the accumulated degradation degree of the performance is quantized through the relative variation of the electro-optical conversion efficiency and the waste heat, so that the performance loss of the laser transmitter is reflected.
In one embodiment, the product of the performance degradation indicator of the laser transmitter and the instantaneous anomaly indicator of the laser transmitter at the current time is determined as the health indicator of the laser transmitter at the current time. Considering that the normal fluctuation is misjudged as a fault by singly depending on the instantaneous abnormal index, or the risk that slow fading is not enough but is almost critical is ignored, and the immediate failure risk caused by short-term severe fluctuation cannot be perceived only according to the performance fading index. Therefore, through the product form of the two, the health index comprises the basic risk of long-term decay, and the instant dynamic risk is superposed, so that the evaluation result reflects the performance decay degree of the equipment and can reflect the instant stability. For example, if the performance degradation index is higher (the long-term loss is serious) and the instantaneous abnormal index suddenly increases (the current fluctuation is severe), the product result can obviously amplify the risk signal, accurately reflect the abnormal state of long-term degradation and short-term instability, accord with the actual operation rule of the laser transmitter that the "chronic loss and acute fluctuation jointly determine the health degree", and provide a more comprehensive and accurate quantification basis for maintenance decision.
Since the performance degradation indicator of the laser transmitter at the current time has been corrected in the previous step, the performance degradation indicator herein refers to the corrected performance degradation indicator.
For example, the number of the cells to be processed,Health index of time,Is thatAn instantaneous anomaly index of the moment of time,Is thatPerformance degradation index after time correction.
And S6, monitoring the running state according to the health index.
The health index eliminates the interference of normal aging, and the value of the health index can directly reflect the unexpected risk level of the laser transmitter at present. Acquiring the laser transmitter in the steps S1 to S5Health index of time of day, andHealth index of 50 times before time, and normalizing the maximum and minimum valuesAnd normalizing the health index at the moment to enable the health index to be in the range of 0 and 1.
Setting the health threshold to 0.8 (the experience value comprehensively considers the balance of the fault early warning sensitivity and the false alarm rate of the laser emitter under the typical working condition), and judging that the laser emitter is abnormal in operation when the abnormal descending amplitude of the electro-optic conversion efficiency and the abnormal increasing degree of the waste heat form a remarkable synergistic effect when the health index is larger than or equal to 0.8 at each moment of the operation of the laser emitter, the instantaneous fluctuation of the voltage and the current exceeds the stable range under the normal working condition and accords with the characteristics of the laser emitter in fault or close to the critical state of the fault, and if the health index is smaller than 0.8, the synergistic effect of the abnormal descending amplitude of the electro-optic conversion efficiency and the abnormal increasing degree of the waste heat is lower, and the core performance and the operation stability of the laser emitter are in the normal range and are judged to be normal in operation.
In a word, the monitoring mechanism not only avoids misjudgment caused by normal aging interference, but also can accurately capture abnormal states caused by non-aging factors through comparison of the health index and the threshold value, so that the judgment result of the running state accords with the actual health level of the laser emitter, a quantitative basis is provided for timely taking maintenance measures (such as fault investigation during abnormal conditions and routine inspection during normal conditions), and timeliness and accuracy of fault early warning are effectively balanced.
While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only.
Claims (8)
1. A method for monitoring the operational status of a laser transmitter, comprising:
The method comprises the steps of obtaining voltage, current, reference driving power, actual driving power and reference heat dissipation power of a laser transmitter at each moment in the operation process, and setting any moment as the current moment;
Determining instantaneous abnormality indexes of the laser transmitter at the current moment according to respective variation amounts and variation rates of the voltage and the current of the laser transmitter at the current moment, wherein the instantaneous abnormality indexes comprise respectively carrying out standardization processing on the variation amounts and the variation rates of the voltage/current of the laser transmitter at the current moment, multiplying the standardized variation amounts and the standardized variation rates of the voltage/current to form a voltage/current dynamic risk item, taking the sum of the voltage dynamic risk item and the current dynamic risk item as the instantaneous abnormality indexes at the current moment, and setting the respective variation amounts and the variation rates of the voltage and the current as forward quantization indexes of the instantaneous abnormality indexes;
Determining respective change amounts and change rates of voltage and current at the current moment, namely taking the difference between the voltage/current of the laser transmitter at the current moment and the reference voltage/reference current at the current moment as the change amount of the voltage/current at the current moment, taking the difference between the voltage/current of the laser transmitter at the previous moment and the reference voltage/reference current at the previous moment as the change amount of the voltage/current at the previous moment, subtracting the change amount of the voltage/current at the previous moment from the change amount of the voltage/current of the laser transmitter at the current moment, dividing by the time interval between the current moment and the previous moment, and taking the difference as the change rate of the voltage/current at the current moment;
determining the sum of the relative reduction degree of the electro-optic conversion efficiency of the laser transmitter at the current moment and the relative increase degree of the waste heat as a performance degradation index of the laser transmitter at the current moment, wherein the relative reduction degree of the electro-optic conversion efficiency is determined based on the ratio of the reduction degree of the electro-optic conversion efficiency to the reference electro-optic conversion efficiency;
And determining the product of the performance degradation index of the laser transmitter and the instantaneous abnormality index of the laser transmitter at the current moment as the health index of the laser transmitter at the current moment, and determining the running state of the laser transmitter according to the comparison result of the health index and the preset health index threshold value so as to realize real-time monitoring of the laser transmitter.
2. The method of claim 1, wherein the reference drive power is determined based on:
The method comprises the steps of collecting voltage, current, ambient temperature, internal temperature and set power of a laser transmitter at each moment in the running process of a healthy state in advance;
The method comprises the steps of taking voltage/current as a dependent variable, taking ambient temperature, internal temperature and set power as independent variables, and determining a functional relation between the voltage/current, the ambient temperature, the internal temperature and the set power through data fitting operation to obtain a reference voltage/reference current prediction model;
the product of the reference voltage and the reference current at each time is used as the reference driving power at that time.
3. The method of claim 1, wherein the reference heat dissipation power is determined based on:
the reference driving power of the laser emitter at each moment is subtracted by the set power of the laser emitter at the moment to obtain a value which is taken as the reference heat dissipation power of the laser emitter at the moment.
4. The method of claim 1, wherein the magnitude of the decrease in the electro-optical conversion efficiency and the reference electro-optical conversion efficiency are determined based on:
Taking the ratio of the set power of the laser transmitter at the current moment and the reference driving power at the current moment as the reference electro-optic conversion efficiency at the current moment;
Taking the ratio of the set power of the laser transmitter at the current moment and the actual driving power at the current moment as the actual electro-optic conversion efficiency at the current moment;
The difference between the reference and actual electro-optical conversion efficiencies at the present time is used as the decreasing width of the electro-optical conversion efficiency.
5. The method of claim 1, wherein the increase in waste heat is determined based on:
Taking the difference value between the actual driving power of the laser transmitter at the current moment and the reference driving power at the current moment as a driving power increment;
taking the product of the set power of the laser transmitter at the current moment and the relative reduction degree of the electro-optic conversion efficiency of the laser transmitter at the current moment as compensation driving power, wherein the compensation driving power is used for reflecting the light energy loss caused by the reduction of the electro-optic conversion efficiency of a power control system of the laser transmitter and requires additional input driving power;
and subtracting the compensation driving power from the driving power increment to obtain a waste heat increment.
6. The method of claim 1, wherein after determining the sum of the relative decrease in the electro-optic conversion efficiency of the laser transmitter at the current time and the relative increase in the waste heat as the performance degradation indicator of the laser transmitter at the current time, further correcting the performance degradation indicator by analyzing the aging trend, comprising:
the method comprises the steps of quantifying an aging coefficient of a laser transmitter according to the ratio of the running time of the laser transmitter to the design service life of the laser transmitter, quantifying a performance degradation component generated by an aging trend according to the product of the aging coefficient and the performance degradation index, and removing the performance degradation component generated by the aging trend from the performance degradation index of the laser transmitter at the current moment to obtain the performance degradation index of the laser transmitter after correction at the current moment.
7. The method for monitoring the operation state of a laser transmitter according to claim 1, wherein the method for respectively performing standardized processing on the change amount of the voltage/current and the change rate of the voltage/current of the laser transmitter at the present moment is as follows:
Taking the ratio of the change amount of the voltage/current at the current moment to the reference voltage/reference current at the current moment as the standardized change amount of the voltage/current;
The ratio of the standard deviation of the change rate of the voltage/current at the present time to the change rate of the voltage/current at the history time is taken as the normalized change rate of the voltage/current.
8. The method for monitoring the operation state of a laser transmitter according to claim 1, wherein the method for determining the operation state of the laser transmitter according to the comparison result of the health index and the preset health index threshold value is as follows:
If the health index of the laser transmitter at the current moment is larger than or equal to a preset health index threshold, the laser transmitter is judged to be abnormal in operation at the current moment, and if the health index of the laser transmitter at the current moment is smaller than the preset health index threshold, the laser transmitter is judged to be normal in operation at the current moment.
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| US5151909A (en) * | 1990-10-16 | 1992-09-29 | Laserscope | Frequency doubled solid state laser having programmable pump power modes and method for controllable lasers |
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