JP2010164544A - Comparison measurement instrument for change in physical value - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a comparison measurement instrument for a physical value in no use of metal wire which determines the change in a physical value, by transferring physical value change information with optical fibers. <P>SOLUTION: A physical value change measuring unit operating on low power consumption by using a battery as a power supply is intermittently operated to obtain digital data; the digital data is converted into an optical signal, which is transferred to the physical value measurement instrument through optical fibers; and the measurement instrument converts the transferred optical signal into an electrical signal, determines a change in the physical value and makes comparative measurement with a known technology that utilizes optical fiber as a sensor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention measures physical quantity changes using an optical fiber as a sensor, and compares physical quantity changes for field observation using an optical fiber as a data transmission means, measuring changes in physical quantity with low power consumption using a battery as a power source. Related to measuring equipment. In particular, for the purpose of long-term observation in the field, with a configuration that does not use metal wires (metal-less cable configuration), only an optical fiber is installed between the sensing portion of the physical quantity change and the physical quantity measurement device, It is related to high-precision measurement with electromagnetic induction noise resistance and physical quantity change comparison measurement equipment with lightning resistance that reduces the frequency of maintenance and inspection.

  Optical fibers are not only used as a means of transmitting light, but also as sensors that respond to changes in physical quantities, such as temperature, pressure, and strain. These measurements make use of the fact that the optical distance of the optical fiber changes due to changes in the physical quantity and the phase of the generated light is shifted from the reference optical path length. Changes in temperature, pressure, and expansion / contraction acting on the optical fiber can be measured directly from the phase difference of the light caused by the optical path difference, but in the case of other changes in physical quantities, it is converted into changes in temperature, pressure, and expansion / contraction and acts on the optical fiber. And measure the phase difference of the light. On the other hand, there are some examples that use the signal of light scattered back and convert the change of physical quantity into light intensity.

  The signal to be measured by an optical fiber as a sensor responding to changes in physical quantities (temperature, pressure, expansion and contraction detection sensors) is light, and changes in physical quantities using temperature changes in temperature, pressure, and expansion / contraction using part of the optical fiber However, since the optical transmission distance is long, it is possible to obtain change information of distant points. Measurement using an optical fiber sensor can use the entire length of about 20 km as a sensor. Measurements using optical fibers are suitable for outdoor observation because they do not need to supply power and are lightning-proof. For example, in the known temperature measurement technique using the entire length of the optical fiber as a sensor, the distance resolution is about 1 m and the temperature resolution is about ± 0.1 ° C. However, the fact that changes in environmental temperature can be measured with optical fibers means that the measurement results of changes in physical quantities due to optical fibers are easily affected by temperature changes, and it is necessary to consider the effects of temperature changes. It has been done. (See Non-Patent Documents 1 and 2).

  In order to estimate the effect of the temperature change, a thermometer using a semiconductor sensor, a platinum resistance thermometer, etc. should be installed in the vicinity of the optical fiber and the ambient temperature measured accurately. However, in the case of these thermometers, it is necessary to supply power to the sensor unit, amplify an electrical signal reflecting the temperature change in the sensor unit, and transmit the signal to the recording unit. In other words, as long as the known technology is used, power supply is required, and a composite cable composed of an optical fiber and a metal wire for power supply is required.

  Even when measuring changes in physical quantities converted to changes in pressure and expansion / contraction, it is sufficient to accurately perform pressure / expansion / contraction changes using known techniques in order to compare with the measurement results of known techniques. The power must be supplied to the sensor, the electrical signal reflecting the pressure and expansion / contraction changes must be amplified at the sensor unit, and the signal must be transmitted to the recording unit. In other words, a composite cable composed of optical fibers and metal wires for power supply is required.

  It has been found that when a crystal temperature sensor as an oscillation temperature sensor is used to measure the environmental temperature, a high-resolution temperature measurement can be performed (Patent Document 1), and an average power consumption of several μW, and a temperature measurement unit It can be used to transmit environmental temperature change information via optical fiber. (Sensor part in the embodiment of FIG. 9 of Patent Document 1).

  In addition, the technique disclosed in Patent Document 2 shows an example in which length, pressure, and temperature can be measured with low power consumption. With the disclosed technology, changes in physical quantities can be converted to digital data with power consumption of several μW.

On the other hand, if solar cells are used, light energy can be converted into electrical energy, so that electrical energy can be transmitted as optical energy through an optical fiber, and this light energy can be converted into electrical energy as needed.
Patent application Date of application December 10, 2008 Applicant Tsuneo Yamauchi (1 person) Frequency change measurement method and apparatus Japanese Patent Application No. 2008-335919 Physical quantity change measurement system and standard time compliant data identification method. Japan Society of Civil Engineers 57th Annual Lecture, VI-109, (September 2002). Examination of installation method of optical fiber sensor for monitoring of slope. Production Research Volume 56, Issue 2 (2004) Research Bulletin. Long-term continuous monitoring of wall members using optical fiber sensors. Hitachi Cable 20 (2001-1). Practical application of optical fiber sensor for river management. (P.27-32).

  When the first known technology that does not use an optical fiber and the second known technology that uses an optical fiber as a sensor are placed side by side to perform comparative observation of changes in physical quantity, the first known technology does not have a commercial power supply and supplies power. If this is not possible, high-precision measurements cannot be made unless power is supplied from a remote location with a metal wire or power supplied by a solar cell or the like. There is a danger, and the sensing electronic circuit is likely to break down due to the induced voltage caused by lightning, and it is not possible to measure with high accuracy due to the influence of electromagnetic noise. In addition, a composite cable with an optical fiber is more expensive to manufacture than a configuration in which optical fibers used in the present invention are bundled. Power systems using solar cells are also expensive and expensive to maintain. If a measurement device with high physical accuracy can be operated with low power consumption, a metal wire will be unnecessary, the lightning resistance of the measurement device will be improved, and it will not be affected by electromagnetic noise.

  In the case of the second known technique in which a change in physical quantity is measured using a part or the entire length of an optical fiber sensor as a sensor, the influence of a change in environmental temperature is superimposed on the measurement result, so that a highly accurate measurement result can be obtained It is necessary to measure the ambient temperature in the vicinity of the sensor with high accuracy and correct the influence of the ambient temperature superimposed on the measurement result.

  In the present invention, 1) the temperature measurement unit and the physical quantity measurement unit are reduced in power consumption, the battery is used as a power source to obtain information on changes in environmental temperature and physical quantity, and the information is transmitted through the optical fiber, and the temperature change transmitted through the optical fiber. Development of a device for comparing and measuring changes in physical quantities between a first physical quantity measuring device that uses temperature and physical quantity changes to determine temperature and physical quantity changes, and 2) a second physical quantity measuring device that uses an optical fiber as a sensor. Do it. In the present invention, the physical quantity measuring unit and the physical quantity measuring device are installed at a long distance by taking advantage of the characteristics of the optical fiber for the purpose of measuring the physical quantity change with high accuracy in the field. Because it uses optical fiber as a medium without using metal wires, it has excellent lightning protection and enables long-term observation in the field.

The present invention has been made to solve the above problems, and the first aspect of the present invention is defined as follows.
The temperature sensor, scheduler, battery, digital data conversion means, and a low power consumption temperature measurement unit having a first optical fiber for data transmission are used to control the change in the environmental temperature as digital data under the control of the scheduler. A first physical quantity measuring device (temperature measuring device) that transmits the optical data by an appropriate means, and a second physical quantity measuring device having an optical fiber sensor that is a second optical fiber; The electromagnetic noise resistance and lightning damage of a metalless cable configuration using an optical fiber, which includes a temperature change measurement by the temperature measurement device and a physical quantity change measurement by a second physical quantity measurement device using an optical fiber sensor. This is a comparative measurement device for physical quantity changes with excellent properties.

  In the present invention, a battery is used as a power source to operate a temperature measuring unit with low power consumption. In this temperature measuring unit, the temperature change is converted into digital data and transmitted to the temperature measuring device as an optical signal through the first optical fiber. Do it. For this reason, the temperature measuring unit according to the present invention can obtain information on the environmental temperature in the vicinity of the optical fiber without a power source or a metal wire for signals. A temperature measurement unit that cuts the first optical fiber at a target location in a state where a change in physical quantity is measured by a second physical quantity measuring device using a second optical fiber as a sensor by using a known technique. If you install, you can get detailed information on the ambient temperature at that location.

  As mentioned above, the measurement results from optical fiber sensors are easily affected by temperature changes, and it is pointed out that it is necessary to consider the effects of temperature changes. (Non-Patent Documents 1 and 2). If the temperature measurement unit accurately measures the environmental temperature in the vicinity of the optical fiber and corrects the influence of the temperature change that overlaps the measurement result of the physical quantity change measured by the optical fiber sensor using the obtained temperature change information, As a result, highly accurate measurement data of physical quantities can be obtained.

  An electronic circuit connected to a signal line or power line may fail due to an induced voltage caused by a lightning strike induced through the power line or signal line. However, since the data transmission medium between the temperature measurement unit and the temperature measurement device according to the present invention is an optical fiber and does not use a metal wire, the electronic circuit of the temperature measurement unit is caused by an induced voltage caused by a lightning strike. There is no breakdown and lightning damage resistance. On the other hand, the second physical quantity measuring device using an optical fiber as a sensor does not break down due to the induced voltage caused by lightning, and as a result, comparative measurement of physical quantity changes over a long period can be performed.

The second aspect of the present invention is defined as follows. That is,
The change in temperature acting on the entire length of the optical fiber sensor is an object to be measured, and the physical quantity described in the first aspect of accurately measuring the temperature with the temperature measurement unit according to claim 1 at at least one location of the optical fiber sensor. Change comparison measurement device.

  In the case of a temperature measurement unit including a quartz temperature sensor as an example of the oscillation type temperature sensor to which the above-described Patent Technology 1 is applied, a change in environmental temperature is converted into digital data as a frequency change, and the data is transmitted as an optical signal. The electronic circuit that operates operates with a power of several μW or less (see the sensor unit 30 in the configuration diagram of FIG. 9 of the patent document).

  When measuring the ambient temperature around the optical fiber using the entire length of the optical fiber, the measurement accuracy of the second temperature change by the known technique is about ± 0.1 ° C. as described above. If the sensor unit 30 shown in the configuration diagram of FIG. 9 of Patent Document 1 is used for an optical fiber and the first temperature change around the optical fiber sensor is measured, the change in the environmental temperature is accurate to about ± 0.001 ° C. It can be measured. As described above, the first temperature change with high measurement accuracy is obtained at any one point of the optical fiber, and the first temperature change obtained by the optical fiber over the entire length is obtained based on the spatial distribution of the second temperature change. The measurement accuracy of the second temperature change by the optical fiber can be improved by interpolating or extrapolating using the high-precision measurement result that is the temperature change of 1. By using the temperature measurement method according to the present invention, the first temperature change with high measurement accuracy is obtained at a number of points along the optical fiber, and if the change is used for calculation, the measurement accuracy of the second temperature change by the optical fiber can be obtained. It can be further improved.

The third aspect of the present invention is defined as follows. That is,
A low power consumption physical quantity measuring unit having a sensor responding to a change in physical quantity, a scheduler, a battery, digital data conversion means, and a first optical fiber for data transmission is used to control the change in the physical quantity under the control of the scheduler. And a second physical quantity measuring device having an optical fiber sensor which is a second optical fiber, and a first physical quantity measuring device which transmits the digital data by an appropriate means, and a second physical quantity measuring device. An electromagnetic noise resistance and lightning damage of a metalless cable configuration using an optical fiber, which is configured to measure a physical quantity change by the first measuring device and measure a physical quantity change by a second measuring device using an optical fiber sensor. This is a comparative measurement device for physical quantity changes with excellent properties.

  The technology of Non-Patent Document 2 has low power consumption and can measure pressure changes and expansion / contraction changes (strain changes) using batteries as a power source. On the other hand, as described above, a known technique for detecting a change in pressure or expansion and contraction acting on an optical fiber using a part of an optical fiber sensor is known. With the method defined by the present invention, it is possible to carry out a comparative observation with a physical quantity measurement unit that uses a battery as a power source for changes in pressure and expansion and contraction acting on the optical fiber.

  Measurements of physical quantities using known technologies that do not use optical fiber sensors consume a large amount of current, and it was necessary to supply power using metal wires or rely on a solar cell system in the field without commercial power. If a metal wire is used, it is prone to failure during lightning strikes, and the power supply system using solar cells is expensive to install, and the accompanying secondary battery consumption is severe and the maintenance costs are expensive. However, the method according to the present invention does not use a metal wire, does not require a power supply system using a solar cell, and can build a measuring device for physical quantity changes that is resistant to electromagnetic noise and excellent in lightning damage resistance.

The fourth aspect of the present invention is defined as follows. That is,
The temperature measurement unit described in the first aspect, the second aspect, and the physical quantity measurement unit described in the third aspect include a secondary battery and a conversion unit that converts light energy into electrical energy. The temperature measuring device described in the second aspect and the first physical quantity measuring device described in the third aspect use the appropriate means to convert the light energy to the temperature measuring unit and the physical quantity via the third optical fiber. A first aspect of transmitting to the measurement unit, converting the transmitted light energy into electrical energy by the conversion means of the temperature measurement unit and the physical quantity measurement unit, and charging the secondary battery; and The physical quantity change comparative measurement device described in the third aspect.

  With the technique disclosed in Patent Document 2, an electronic circuit as a physical quantity measurement unit can be operated with an average power consumption of several μW. Therefore, even if the energy that is transmitted as light energy and converted into electrical energy is relatively small, the temperature measurement unit / physical quantity measurement unit of the present invention can be operated for a long time, and the digital signal reflecting the change in the physical quantity can be transmitted by the optical fiber. It can be transmitted to a physical quantity measuring device.

  Specifically, the power supply for the temperature measurement unit and physical quantity measurement unit will be described in detail. The amount of light from the light source of the light emitting diode, the loss due to scattering in the optical fiber, the conversion efficiency from light energy to electrical energy in the sensor unit Considering the above, it is possible to secure electric energy of about 10μW. Long-term measurements can be made by measuring changes in physical quantities while charging secondary batteries with this electrical energy. If the efficiency of conversion to electrical energy is poor, 1) increase the number of optical fibers used for optical energy transmission. 2) Collect light with an optical fiber collimator, 3) Change the light source to a powerful laser, etc.

  If the amount of charge by light energy is sufficient, the scheduler is not necessary, but if the amount of charge is insufficient, for example, the real-time clock SM8578BV of Seiko NPC Co., Ltd. is used as a scheduler, and the unit is intermittently turned on and operated. This can be solved by reducing the average current consumption and performing long-term measurements.

  If the above method. With a configuration in which multiple optical fibers are bundled, changes in physical quantities can be measured without using composite cables containing metal wires. For this reason, as disclosed in Non-Patent Document 3, “there is no need to take induction and lightning protection measures and there is no risk of electric shock”, and the electronic circuit fails due to an induced voltage caused by a lightning strike induced by a metal wire. And the disadvantages that are easily affected by electromagnetic noise can be eliminated, and errors that overlap the measurement results can be corrected by comparing with measurement data obtained by known technology or by correcting the temperature.

  A first embodiment of a physical quantity change comparison measuring apparatus according to the present invention will be described with reference to FIG. A temperature measurement unit 11 that operates with low power consumption and constitutes the embodiment of FIG. 1 includes a temperature sensor 12, a scheduler 13, a battery 14, and a digital data conversion means 15, and a temperature measurement device that processes digital data. 17 has a function of processing digital data transmitted through the first optical fiber 16 for data transmission. Furthermore, the physical quantity measuring device 18 according to a known technique has a second optical fiber sensor 19 as an optical fiber sensor.

  In the embodiment of FIG. 1, the battery 14 is used as the power source of the temperature measurement unit 11, the temperature sensor 12 and the digital data conversion means 15 convert the temperature change information into digital data by the action of the scheduler 13, and the digital data is converted into the first light. It is transmitted to the temperature measuring device 17 through the fiber 16. The temperature measuring device 17 obtains the environmental temperature by an appropriate means. In this case, the scheduler 13 controls the power supplied to the temperature measurement unit 11 to perform measurement. Further, based on the optical signal reflecting the change in the physical quantity, which is a response signal from the optical fiber sensor 19, by the physical quantity measuring device 18, the change in the physical quantity is obtained by an appropriate means and the physical quantity change is compared and measured.

  A second embodiment of a physical quantity change comparison measuring apparatus according to the present invention will be described with reference to FIG. In the embodiment of FIG. 2, the temperature measuring unit 21, the first optical fiber 26, the temperature measuring device 27, the physical quantity measuring device 28 according to a known technique for measuring the change of the environmental temperature, and the second light as the sensor thereof. Using the fiber sensor 29, the environmental temperature is compared and measured as a change in physical quantity. In FIG. 2, an oscillation temperature sensor 22 is provided as a sensor that responds to a change in physical quantity constituting the temperature measurement unit 21 in FIG. When the oscillation type temperature sensor 22 is used, the change of the environmental temperature can be converted into digital data by the counter as the digital data conversion means 25 by the scheduler 23 and the battery 24 (see Patent Document 1). The converted digital data is transmitted to the temperature measuring device 27 via the first optical fiber 26. When the digital data is processed by the temperature measuring device 27, if a detailed conversion table or conversion formula is created between the frequency change value and the environmental temperature in advance, the environmental temperature change can be obtained with high accuracy.

  According to a known technique, a temperature change is required over the entire length of the optical fiber sensor 29 as a sensor. Therefore, when the optical fiber 26 is installed in a bundle with the optical fiber sensor 29, the optical fiber 26 can measure a temperature change with high accuracy at any point along the optical fiber sensor 29. (The optical fiber 26 is cut at a necessary position and used for data transmission). In the figure, an example is shown in which the ambient temperature is measured by the method according to the present invention near the tip of the optical fiber sensor 29 (“◯” in the figure). In the embodiment according to the present invention, the environmental temperature can be accurately measured at any point of the optical fiber sensor 29 by the technique using the oscillation temperature sensor 22, and the result is used to obtain the optical fiber sensor 29. The temperature measured by can be compared. If a plurality of optical fibers 26 are used, the temperature can be measured at a plurality of points, and the results can be used to compare the temperature measured by the optical fiber sensor 29 at a plurality of points.

  When the environmental temperature A around the optical fiber 29 is measured by the physical quantity measuring device 28 using the entire length of the optical fiber sensor 29 by a known technique, the measurement accuracy of the temperature A is about ± 0.1 ° C. If the environmental temperature B is measured at an arbitrary point of the optical fiber sensor 29 by the method of the present invention, the measurement accuracy of the temperature B is about ± 0.001 ° C. (see Patent Document 1). In this way, the temperature B with high measurement accuracy is obtained at any one point of the optical fiber sensor 29 by the optical fiber 26 bundled with the optical fiber sensor 29, and the total length is obtained by the optical fiber sensor 29. On the basis of the spatial distribution of the temperature A, the temperature A obtained using the entire length of the optical fiber 29 is interpolated or extrapolated using the high-precision temperature B obtained by the second embodiment. Measurement accuracy can be improved. If the temperature B with high measurement accuracy obtained at many points along the optical fiber sensor 29 is interpolated or extrapolated, the measurement accuracy of the temperature A can be improved. That is, the temperature can be measured along the optical fiber 29 with high accuracy.

  In the acoustic positioning system used for seafloor crustal deformation observation, it is necessary to know the temperature in seawater of several kilometers accurately in real time in order to correct the disturbance of the sound velocity in the seawater. However, although there is no technology that can measure the entire section in real time at about ± 0.01 ° C, if the thermometer according to the present invention is provided with a temperature measurement unit at an appropriate interval, an optical fiber sensor placed in the sea The temperature in seawater can be obtained in real time with an accuracy of about ± 0.01 ° C.

  A third embodiment of a physical quantity change comparison measuring apparatus according to the present invention will be described with reference to FIG. The physical quantity measuring unit 31 in FIG. 3 includes a sensor 32, a scheduler 33, a battery 34, and a digital data conversion unit 35 that respond to changes in physical quantities, and is connected to the first physical quantity measuring device 37 by a first optical fiber 36. Transmit digital data for A second physical quantity measuring device 38 according to a known technique has an optical fiber sensor 39 as a second optical fiber.

  In the embodiment of FIG. 3, the battery 34 is used as the power source of the physical quantity measurement unit 31, the physical quantity change is digitized by the sensor 32 and the digital data conversion means 35 by the action of the scheduler 33, and the obtained digital data is converted into the first optical fiber 36. Is transmitted to the first physical quantity measuring device 37. Then, the physical quantity measuring device 37 obtains the change of the physical quantity. In this case, the power supplied to the physical quantity measurement unit 31 is appropriately controlled by the scheduler 33 for measurement. Further, based on the optical signal reflecting the change in the physical quantity, which is a response signal from the optical fiber sensor 39, the second physical quantity measuring device 38 obtains the change in the physical quantity by an appropriate means, and performs a comparative measurement of the change in the physical quantity. In this example, the physical quantity is compared and measured at the “○” part at the tip. Specifically, although not shown in the figure, a pressure change is measured or a stretch change (strain change) is measured, but a comparative measurement is possible at any position in the middle of the optical fiber. It is also possible to select.

  A fourth embodiment of a physical quantity change comparison measuring apparatus according to the present invention will be described with reference to FIG. In the embodiment of FIG. 4, the second physical quantity measuring device 48 measures the pressure change acting on the optical fiber sensor 49 (in the case where the pressure is measured by the pressure sensor portion provided at the “◯” portion at the tip of the figure). And a physical quantity measuring unit 41 having a conversion means 41A for converting light energy into electrical energy by a first physical quantity measuring device 47 having a light emitting means 47A, and measuring a change in temperature (an example of a change in physical quantity). This is an example of measurement. While the pressure change is measured by the second physical quantity measuring device 48, it is transmitted from the first physical quantity measuring device 47 to the physical quantity measuring unit 41 via the optical fiber 47 </ b> B for optical energy transmission by an appropriate means. This light energy is converted into electrical energy by the conversion means 41A for converting the light energy provided in the physical quantity measuring unit 41 into electrical energy, and the oscillation temperature sensor 42 (of the physical quantity is controlled by the scheduler 43 while charging the secondary battery 44). Measure the temperature change (example of physical quantity change) in the example of sensor responding to change), and compare both.

  In the embodiment shown in FIG. 4, the optical energy is transmitted from the first physical quantity measuring device 47, but the optical energy is transmitted from the second physical quantity measuring device 48, or the optical energy is transmitted by a dedicated device. However, the same effect can be obtained. In this case, if the power consumption of the first physical quantity measurement unit is large, the physical quantity measurement unit is operated intermittently by the scheduler, and long-term observation is performed while avoiding the consumption of the secondary battery.

  Although not shown here, as in the method shown in the third embodiment of the present invention, for example, measurement of strain change using a physical quantity measurement unit that operates with low power consumption, and strain change using a part of an optical fiber. If the environmental temperature is accurately measured by the method shown in the second embodiment of the present invention while performing a comparative measurement with the (stretching change) measurement, the influence of the temperature change overlapping the result of the comparative observation is corrected. be able to. Although not shown, the second physical quantity measuring device may be used as an optical fiber sensor for transmitting an optical signal by changing the change in physical quantity to light intensity. As shown in this example, as long as the optical fiber can be secured, multiple observation items can be carried out at the same point, and multi-item observation can be performed along the optical fiber.

  Although not shown here, maintenance is easy if the temperature measurement unit or physical quantity measurement unit according to the present invention is provided with a switch and an indicator, and the switch is appropriately operated to check the measurement result and the battery consumption status. .

  In the above, an example (temperature, pressure, expansion and contraction change) was measured using an electronic circuit created from electronic components using a sensor that responds to changes in physical quantities as a physical quantity measurement unit. In addition to the above, the physical quantity measuring unit has a function of low power consumption operation or an intermittent operation function with low average power consumption, and has means for transmitting the change in physical quantity into a digital value and transmitting it by optical fiber. If this is the case, the present invention can be applied, and some or all of these circuits can be integrated into an IC.

  The present invention is not limited to the description of the above-described embodiments and examples, and various modifications are possible within the scope of the present invention without departing from the description of the scope of claims. include.

  1 is a diagram showing a first embodiment of a comparative measurement apparatus for physical quantity changes according to the present invention.   Second embodiment of a physical quantity change comparison measuring apparatus according to the present invention.   Third embodiment of a comparative measurement apparatus for physical quantity changes according to the present invention.   4 shows a fourth embodiment of a comparative measurement apparatus for physical quantity changes according to the present invention.

11, 21 ... temperature measuring unit,
31, 41 ... Physical quantity measuring unit,
12 ... temperature sensor, 22 ... oscillating temperature sensor,
32 ... Sensor, 42 ... Pressure sensor,
13, 23, 33, 43 ... scheduler,
14, 24, 34, 44 ... battery,
15, 25, 35, 45 ... digital data conversion means,
16, 26, 36, 46, 47B ... optical fiber,
17, 27, 37, 47 ... first physical quantity measuring device,
18, 28, 38, 48 ... second physical quantity measuring device,
19, 29, 39, 49 ... optical fiber sensors,
41A ... Conversion means, 47A ... Light emitting means, 49 ... Optical fiber

Claims (4)

The temperature sensor, scheduler, battery, digital data conversion means, and a low power consumption temperature measurement unit having a first optical fiber for data transmission are used to control the change in the environmental temperature as digital data under the control of the scheduler. A temperature measuring device that transmits the data through an optical fiber and receives the digital data by an appropriate means, and a physical quantity measuring device having an optical fiber sensor that is a second optical fiber, and a temperature change caused by the temperature measuring device. Measurement device for physical quantity changes characterized by excellent resistance to electromagnetic noise and lightning damage of metalless cable configuration using optical fiber, measurement of physical quantity using physical quantity measuring equipment using optical fiber sensor . The physical quantity according to claim 1, wherein a change in temperature acting on the entire length of the optical fiber sensor is an object to be measured, and the temperature is measured by the temperature measurement unit according to claim 1 at at least one location of the optical fiber sensor. Change comparison measurement device. A low power consumption physical quantity measuring unit having a sensor responding to a change in physical quantity, a scheduler, a battery, digital data conversion means, and a first optical fiber for data transmission is used to control the change in the physical quantity under the control of the scheduler. And a second physical quantity measuring device having an optical fiber sensor which is a second optical fiber, and a first physical quantity measuring device which transmits the digital data by an appropriate means, and a second physical quantity measuring device. The electromagnetic noise resistance of the metalless cable configuration using the optical fiber, which is configured to measure the physical quantity change by the first physical quantity measuring device and measure the physical quantity change by the second physical quantity measuring device using the optical fiber sensor. A comparative measurement device for physical quantity changes characterized by excellent lightning damage resistance. The temperature measurement unit according to claim 1 and claim 2 and the physical quantity measurement unit according to claim 3 comprise a secondary battery and a conversion means for converting light energy into electrical energy, 2 and the first physical quantity measuring device according to claim 3 transmit light energy to the temperature measuring unit and the physical quantity measuring unit via the third optical fiber by appropriate means, The transmitted light energy is converted into electrical energy by the conversion means of the temperature measurement unit and the physical quantity measurement unit, and the secondary battery is charged. Apparatus for comparative measurement of changes in physical quantities as described.

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