CN101034006A - Method for improving measurement precision of photometry measuring instrument - Google Patents
Method for improving measurement precision of photometry measuring instrument Download PDFInfo
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- CN101034006A CN101034006A CN 200710067481 CN200710067481A CN101034006A CN 101034006 A CN101034006 A CN 101034006A CN 200710067481 CN200710067481 CN 200710067481 CN 200710067481 A CN200710067481 A CN 200710067481A CN 101034006 A CN101034006 A CN 101034006A
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- 238000005375 photometry Methods 0.000 title claims description 27
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Abstract
This invention relates to a method of advancing photometric quantity measuring apparatus accuracy of measurement. Method include; measured light through V ( lambda) regulation then be received by detector to turn to current signal, passing iv transducer turn ro voltage alarm, after magnifying then passing A / D transducer turn to digital signal; processing the digital signal, and send the results to PC machine or scope for presentation;this instrument beforehand has passed difference spectral range standard light source adjust, gain different instrument calibration coefficient; And use homologize wave band's instrument calibration coefficient while use this instrument to measure difference wave band light source. The described standard light source is linear light source that has scaling measured by instrument of higher order of accuracy. The described difference spectral range divided into red green blue yellow white five colors.
Description
Technical field
The present invention relates to a kind of measuring method, especially improve the method for measurement precision of photometry measuring instrument.
Background technology
In optical radiation measurement, the amount relevant with energy has two classes: the one, physics, abbreviate radiant quantity as; Another kind of is physiological, is called light quantity (comprising luminous flux, luminous intensity, illuminance, luminance brightness etc.).The radiant quantity of light has comprised whole emittance of UV radiation, visible light and infrared radiation.Human eye vision not only forecloses invisible UV radiation and infrared radiation, and quantitatively, the radiation energy that human eye is experienced also not exclusively equals the actual energy of observable that part of optical radiation (visible light).The basic skills of photometric measurement, the difference according to the used receiver of measuring light tolerance can be divided into two kinds: the one, directly carry out photometric measurement as receiver with human eye, be called the visual luminosity method.The 2nd, carry out photometric measurement with the physical detecting device as receiver, be called physics photometry or objective photometry.
Physics photometry or objective photometry use photodetector to replace human eye to measure, so require used detector and human eye that same characteristic is arranged, promptly its spectral response characteristic should be consistent with the spectral luminous efficiency V (λ) of human eye.The retina of human eye is different to the luminous sensitivity of visible light different wave length, and is the highest to the sensitivity of green-yellow light to energy is identical but the monochromatic radiation that wavelength is different is felt as different bright degree, then very low to the sensitivity of ruddiness, blue light, purple light.In fact, the spectral response characteristic of existing photodetector all can not be fully consistent with the spectral luminous efficiency V (λ) of human eye, and (a line among Fig. 1 is represented the relative spectral sensitivity of detector as shown in Figure 1; The b line is represented the spectral luminous efficiency of human eye).Therefore, need it be revised, make it to meet the spectral luminous efficiency V (λ) of human eye, promptly carry out V (λ) calibration of detector according to the spectral response characteristic of detector.Generally adopt the method that before sensitive detection parts, adds optical filter to revise, make the spectral transmittance ι (λ) of optical filter consistent, promptly satisfy Lu's Sa condition with combined result and the V (λ) of the relative spectral sensitivity S (λ) of sensitive detection parts:
S (λ) ι (λ)=κ V (λ), κ is a constant.
In fact use the revised spectral transmittance ι of match filter (λ) and combined result and the human eye spectral luminous efficiency V (λ) of the relative spectral sensitivity S (λ) of detector not to meet fully, and the degree that it meets is the main quality index of photo-detector; The quality index of present domestic photo-detector is divided into:
One-level: k＜=± 3%;
Secondary: k＜=± 5%;
Three grades: k＜=± 6-10%.
In general, the reason that influences the surveying instrument measuring accuracy has following aspect:
1. the circuit part components and parts is non-linear;
2. spectral luminous efficiency V (λ) revises the error of introducing;
3. reference instrument is in the cumulative errors of transmitting value;
4.si the nonlinearity of detector;
5. ambient temperature and humidity influence etc.
It is maximum that spectral luminous efficiency V (λ) wherein revises the error of introducing, and directly is subject to the grade of detector.
The following (see figure 2) of the measuring method of existing photometry measuring instrument:
Measured smooth A, process V (λ) calibration is detected device B reception and transfers current signal to, transfer voltage signal to through the IV converter, transfer digital signal (sampled value) to through A/D converter again after the amplification, through single-chip microcomputer digital signal is handled again and (being comprised: the instrument calibration coefficient of using standard sources V to calibrate, be intercept and slope, compare, calculate measurement result); Send PC or display to show result.Wherein, the acquisition methods of the instrument calibration coefficient of calibrating with standard sources (intercept and slope) is: the light source with a higher standard rank of apparatus measures instrument calibration is crossed, compare with its sampled value and standard value, and calculate the instrument calibration coefficient.
The general standard transmission and the measuring method of present photometry measuring instrument all are:
Measure a linear light sorurce with the instrument calibration that precision grade is higher, this light source is come the calibration measurement instrument as standard sources, an instrument is only used an instrument calibration coefficient (as shown in Figure 3).
Because detector carries out V (λ) calibration with a secondary optical filter in whole visible spectrum, so it is differentiated to the V between the different wavelength coverages (λ) calibrated horizontal, this difference shows just apparent in viewly in LED (semiconductor light-emitting-diode) field, the LED industry is all according to above magnitude transferring method at present, adopt the white light standard sources to calibrate, measure all color LED pipes.Because semiconductor light-emitting-diode is discontinuous spectrum, and detector is not exclusively the same to the response of different colours (wave band) light, and this causes the difference of measurement result between the decline of Instrument measuring precision and the same rank instrument to increase.
Summary of the invention
The purpose of this invention is to provide a kind of improvement of photometric measurement metering method, this method should have the characteristics that can significantly improve measuring accuracy, and measuring method is simple adopting photometry measuring instrument to measure the tested light time, and cost is not high.
The technical solution used in the present invention is:
A kind of method that improves measurement precision of photometry measuring instrument, this method comprises:
Measured light, process V (λ) calibration are detected the device reception and transfer current signal to, transfer voltage signal to through the IV converter, transfer digital signal to through A/D converter again after the amplification, digital signal are handled again, and send PC or display demonstration with result; This photometry measuring instrument through the standard sources calibration of different spectral ranges, obtains different instrument calibration coefficients in advance; And with the light source of this apparatus measures different-waveband the time, use the instrument calibration coefficient of corresponding wave band.
Described standard sources is the linear light sorurce of measuring with the higher instrument calibration of precision grade.
Described different spectral range is divided into red, green, blue, Huang, white five kinds of colors.
Measuring method provided by the invention owing in advance through the calibration of the standard sources of different spectral ranges, obtain different instrument calibration coefficients, and with the light source of this apparatus measures different-waveband the time, is used the instrument calibration coefficient of corresponding wave band.Thereby make measuring accuracy improve greatly.Through practice examining, the average measurement precision can improve a grade at least.And this method is simple, and is also convenient to the change of surveying instrument, and cost is not high.
Description of drawings
Fig. 1 is detector sensitivity curve and the human eye spectral luminous efficiency curve synoptic diagram in the spectral range.
Fig. 2 is the measuring principle figure of existing photometry measuring instrument.
Fig. 3 is the calibration mode synoptic diagram of existing photometry measuring instrument.
Fig. 4 is the calibration mode synoptic diagram of measuring method provided by the invention.
Fig. 5 is the photometry measuring instrument measuring principle figure of measuring method provided by the invention.
Fig. 6 is the circuit theory diagrams of surveying instrument.
Embodiment
As shown in the figure, method of testing provided by the invention is: measured smooth A, be detected device B reception through V (λ) calibration (being aforesaid optical filter calibration) and transfer current signal to, transfer voltage signal to through the IV converter, transfer digital signal (sampled value) to through A/D converter again after the amplification, again digital signal is handled and (generally handled through single-chip microcomputer, comprise: the instrument calibration coefficient of using standard sources C to calibrate, be intercept and slope, compare, calculate measurement result), send PC or display to show result; More than be the routine measurement step of existing photometric measurement instrument.
The change that the present invention did is: this instrument through the standard sources calibration of different spectral ranges, obtains different instrument calibration coefficients in advance; And with the light source of this apparatus measures different-waveband the time, use the instrument calibration coefficient of corresponding wave band.
For this reason, the instrument that this light quantity is measured (measure content and comprised luminous flux, light intensity, illuminance and luminance brightness) should be improved, make its coefficient (as 5) that can preserve a plurality of measurements calibration, can select wherein the measurement calibration factor of any one standard to measure.Its detailed process is: the light sources of different colors (as LED) that will cross by higher one-level system calibration is as reference standard light source (i.e. the linear light sorurce of measuring with the higher instrument calibration of precision grade), under the canonical measure condition, survey the photometric signal of LED respectively by detector, signal amplifies through I/V conversion and signal, carry out the A/D conversion then, the luminosity value of LED is converted into digital signal, respectively and separately standard value compares, and the instrument calibration coefficient storage separately that calculates is in the program storage area of chip.
Described different spectral range can be divided into red, green, blue, Huang, white five kinds of colors, can measure and calculate five groups of different instrument calibration coefficients thus and store in advance.
Obviously, the improvement that the present invention does the instrument of measuring only is in order to increase storage data; Thereby the change of apparatus structure is very simple, and those of ordinary skill is enough to be competent at.By among Fig. 6 as can be known, the circuit theory of the surveying instrument among the present invention and the circuit theory of existing instrument are identical.
Because subrane is calibrated, each wave band all has an independently apparatus measures coefficient, just can improve the overall measuring accuracy level of instrument.Just, with same instrument of standard sources calibration of different spectral ranges, used the apparatus measures coefficient (shown in Figure 4) of corresponding wave band during the light source of this apparatus measures different colours (wave band), thereby the actual measurement effect and the precision of instrument are improved greatly.
In the concrete operations, the preparation method of instrument calibration coefficient is measured as example with LED and is described as follows:
With the LED of the red, green, blue of having crossed, Huang, white five kinds of colors by higher one-level instrument calibration as the reference standard light source, carry out following process respectively: the light signal of under the canonical measure condition, surveying LED by detector, signal amplifies (F) through I/V conversion and signal, carry out the A/D conversion then, the luminosity value of LED is converted into digital signal, through single-chip microcomputer (MCU) carry out data processing and and separately standard value compare, calculate the instrument calibration coefficient storage in the program storage area of chip and with the adaptive measurement color of tense marker.When measuring the LED of different colours, instrument selects corresponding instrument calibration coefficient to carry out result of calculation.
When measuring, select corresponding measured tube color by Survey Software, tell slave computer with the instruction condition, or slave computer directly selects corresponding calibration factor by measuring condition, with measurement result by calibration after, send host computer or display interface to.Thereby obtain a photometric measurement value (seeing Fig. 5, Fig. 6) of crossing through color calibration.The improvement of described software can be finished by those of ordinary skill.
Below be described by the measurement of specific embodiment the photometry measuring instrument of LED (semiconductor light emitting diode):
The photometry measuring instrument model that present embodiment adopts is a SSP3316LED light intensity angle distribution measuring apparatus, and the photo-detector grade is a secondary; 5 of quantity.The concrete measurement used higher one-level in the past in advance, i.e. one-level instrument is measured calibration to the LED of red, green, blue, Huang, white five kinds of colors, and the standard value of its light intensity is respectively R, G, B, Y, W; Do standard sources with the LED of this red, green, blue, Huang, white five kinds of colors and calibrate present instrument.The contrast experiment is as follows:
One, with existing 5 instruments of method calibration, promptly calibrates 5 instruments respectively with White LED; Measure the LED standard pipe of red, green, blue, Huang, white five kinds of colors respectively with these 5 instruments, measurement result is as follows:
Two, use measurement scheme of the present invention, promptly the LED with above-mentioned red, green, blue, Huang, white five kinds of colors does standard sources, calibrate every instrument respectively, every instrument all obtains five instrument calibration coefficients R, G, B, Y, W, these coefficients is deposited in the program storage area of every instrument.Corresponding calibration factor R, G, B, Y, W have all been used during the LED of every apparatus measures red, green, blue, Huang, white five kinds of colors.Measurement result is as follows:
By top experiments of measuring result as can be known: accuracy of instrument is three grades when measuring with existing mode, and accuracy of instrument can reach secondary when adopting measuring method provided by the invention to measure, and the deviation of measurement result reduces between the instrument, and consistance improves greatly.
Claims (3)
1, a kind of method that improves measurement precision of photometry measuring instrument, this method comprises:
Measured light (A), process V (λ) calibration is detected the device reception and transfers current signal to, transfers voltage signal to through the IV converter, transfers digital signal to through A/D converter again after the amplification, again digital signal is handled, sent PC or display to show result; It is characterized in that this photometry measuring instrument passes through the standard sources of different spectral ranges (C) calibration in advance, obtains different instrument calibration coefficients; And with the light source of this apparatus measures different-waveband the time, use the instrument calibration coefficient of corresponding wave band.
2, a kind of method that improves measurement precision of photometry measuring instrument according to claim 1 is characterized in that described standard sources (C) is the linear light sorurce of measuring with the higher instrument calibration of precision grade.
3, a kind of method that improves measurement precision of photometry measuring instrument according to claim 1 and 2 is characterized in that described different spectral range is divided into red, green, blue, Huang, white five kinds of colors.
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| CN102564592A (en) * | 2012-01-09 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Pulse flash lamp radiation spectrum measurement device and measurement method |
| CN103344329A (en) * | 2013-07-26 | 2013-10-09 | 杭州远方光电信息股份有限公司 | Handheld optical irradiance meter and correction method thereof |
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- 2007-03-13 CN CN 200710067481 patent/CN101034006A/en active Pending
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| CN102519586A (en) * | 2011-12-28 | 2012-06-27 | 广州合成材料研究院有限公司 | Irradiance meter for laboratory and method for implementing irradiance meter |
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| CN103344329A (en) * | 2013-07-26 | 2013-10-09 | 杭州远方光电信息股份有限公司 | Handheld optical irradiance meter and correction method thereof |
| WO2015010435A1 (en) * | 2013-07-26 | 2015-01-29 | 杭州远方光电信息股份有限公司 | Handheld optical irradiance meter and correction method therefor |
| WO2016045453A1 (en) * | 2014-09-28 | 2016-03-31 | 成都维客亲源健康科技有限公司 | Ultralow power consumption ppg signal acquisition circuit and acquisition method |
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| CN105092037A (en) * | 2015-06-29 | 2015-11-25 | 海宁艾可炫照明电器有限公司 | Method for obtaining measurement spectrum |
| CN105928911A (en) * | 2016-04-11 | 2016-09-07 | 深圳市华科瑞科技有限公司 | Calibration method of fluorescence detection instrument |
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