CN109141683B - Calibration device and method for linear temperature sensor array - Google Patents
Calibration device and method for linear temperature sensor array Download PDFInfo
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- CN109141683B CN109141683B CN201811184877.5A CN201811184877A CN109141683B CN 109141683 B CN109141683 B CN 109141683B CN 201811184877 A CN201811184877 A CN 201811184877A CN 109141683 B CN109141683 B CN 109141683B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 46
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 16
- 238000013459 approach Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
A calibration device and method for a linear temperature sensor array comprises a hard tube, a fixing frame, a linear sensor array, a high-precision platinum thermometer and a demodulator. Fixing the linear sensor and the traction rope to prevent the sensor from being affected by stress; fixing a plurality of high-precision platinum thermometers on a traction rope to enable the positions of the platinum thermometers to be the same as the positions of the sensors to be calibrated; the plastic pipe is vertically fixed by the fixing frame, the bottom is closed, water is filled from the pipe orifice, and the temperature measuring environment in actual still water is simulated; and placing the fixed linear sensor and the thermometer together with the traction rope into a plastic pipe to ensure that the sensor is in a state of being straightened and not stressed in the calibration process. The temperature in the plastic tube is changed by the temperature of the external environment. And (3) comparing the measurement time and the temperature value of the linear sensor with those of the high-precision platinum thermometer, and calibrating the temperature curve of the sensor. The calibration device and the calibration method of the linear temperature sensor solve the problems of low precision, poor consistency, easiness in being influenced by bending stress and the like of the traditional calibration method, and have important application value in the calibration of the high-precision fiber bragg grating temperature sensor.
Description
Technical Field
The invention relates to the field of optical fiber temperature sensing, in particular to a calibration device and method of a linear temperature sensor array.
Background
The fiber grating sensor array has the remarkable advantages of high sensitivity, electromagnetic interference resistance, large space distributed measurement, convenience in networking and the like, and has huge application potential in the field of high-precision temperature sensing. However, the fiber grating sensor directly measures the wavelength change, and thus cannot directly reflect the temperature. The change of the Bragg wavelength of the fiber bragg grating and the change of the temperature are in a linear relation under a certain condition, the relation between the wavelength change of the fiber bragg grating and the environmental temperature change is determined by carrying out temperature calibration on a linear fiber bragg grating sensor, and the temperature value can be accurately calculated through the wavelength, so that the temperature measurement of the fiber bragg grating is realized.
The calibration method of the conventional fiber grating temperature sensor is that the sensor is directly placed in a constant temperature gas box or a constant temperature liquid bath, and the environment temperature is changed by a heating source of the constant temperature gas box or the constant temperature liquid bath. In practice, it has been found that the temperature of the gas or liquid is changed by direct heating, the operation of the heat source and the installation position are affected, and the temperature distribution in the constant temperature gas tank or the constant temperature liquid bath is not uniform due to the limitation of the heat conduction characteristics of the medium, and although many constant temperature devices use fans or stirrers to assist in heat diffusion, the temperature difference at different positions in the device is still very large, such as the temperature accuracy displayed by a certain brand of constant temperature gas tank is 0.1 ℃, but the actual temperature imbalance in the tank is greater than 0.5 ℃, and the temperature difference between the vicinity and the distant area of the heating source of the constant temperature oil bath is greater than 0.5 ℃. In addition, the volume of the constant temperature gas tank or constant temperature liquid bath tank is smaller, and the fiber bragg grating temperature sensor array is mostly arranged in the constant temperature gas tank or constant temperature liquid bath tank in a mode of winding into a disc for calibration. Experiments show that the center wavelength of the fiber bragg grating temperature sensor which is wound on a disc with the diameter of 25cm after being cabled is about 10pm different from that of the fiber bragg grating in a straightened state, and the fiber bragg grating temperature sensor array is stressed under the condition of bending. When the fiber bragg grating which is coiled in a bending way is placed in a constant temperature gas tank or a constant temperature liquid bath tank for temperature calibration, the central wavelength and the temperature of the calibrated fiber bragg grating can be in a nonlinear relation due to the fact that the fiber bragg grating sensor is affected by stress, and therefore the accuracy of the fiber bragg grating temperature calibration can be achieved. The temperature accuracy of the conventional fiber grating sensor is generally designated as 0.5 ℃ under the limitation of the calibration conditions. The precision can meet the requirements of general temperature monitoring such as fire and the like, but in high-precision temperature field monitoring such as dam temperature field monitoring, water environment monitoring, soil moisture content monitoring and the like, the requirements of on-site temperature monitoring are difficult to meet, for example, when the temperature gradient of the water environment is monitored, the temperature measurement precision requirement of a fiber grating sensor is required to be better than 0.1 ℃, and the calibration requirement of the high-precision fiber grating temperature sensor is difficult to meet by adopting the traditional calibration device and method.
Disclosure of Invention
The invention provides a calibration device and method for a linear temperature sensor, which are used for solving the problems of low precision, poor consistency, easiness in being influenced by bending stress and the like of the conventional calibration method for the linear temperature sensor.
The technical scheme adopted by the invention is as follows:
a calibration device of a linear temperature sensor comprises a hard tube, a linear temperature sensor array, a thermometer, a demodulator and a fixing frame.
The bottom end of the hard pipe is sealed and is provided with a valve, and the top end of the hard pipe is open; the hard tube is vertically fixed by the fixing frame;
the hard tube is filled with a liquid heat conducting medium;
one end of the linear temperature sensor array is freely placed downwards along the opening at the top end of the hard tube, and the other end of the linear temperature sensor array is connected with a demodulator;
the thermometer is fixed in parallel with the sensing points on the linear temperature sensor array.
The liquid heat conducting medium is water or oil.
The linear temperature sensor array is a fiber bragg grating array.
The device also comprises a traction rope, wherein the traction rope is fixed with the linear temperature sensor array, and a balancing weight is hung at the free end of the traction rope and used for keeping the plumb state of the traction rope.
The traction rope and the linear temperature sensor array are fixed in a segmented manner by a fixing ribbon and are used for guiding the linear temperature sensor array to be calibrated to be vertically arranged in the hard tube
The thermometer is a platinum electronic thermometer, adopts integrated sealed packaging, is used for setting sampling time interval, has absolute measurement accuracy of 0.01 ℃ and has reaction time superior to 0.1 seconds.
The demodulator is a fiber grating demodulator, the scanning wavelength step is smaller than 4 pm, the wavelength stability is better than 0.1 pm, and the demodulation time of the grating array is smaller than 0.1 second.
The hard pipe adopts a plastic pipe.
A temperature calibration method of a linear temperature sensor comprises the following steps:
s1: fixing the hard tube on a fixing frame, keeping the hard tube and the ground filled directly, closing a bottom valve, injecting a liquid heat conducting medium, bolting a balancing weight on one end of a traction rope, and fixing the linear sensor array to be calibrated with the traction rope;
s2: connecting a plurality of high-precision thermometers with a computer, setting temperature sampling time and interval, fixing the thermometers on a traction rope after the temperature sampling time and interval are set, and ensuring that the positions of probes of the thermometers are the same as the grating positions on a linear sensor array to be calibrated;
s3: placing the haulage rope together with the linear sensor to be calibrated and the thermometer into the hard tube until the balancing weight on the haulage rope approaches the bottom of the hard tube, and fixing the haulage rope at the top of the hard tube;
s4: connecting the other end of the linear temperature sensor array with a fiber bragg grating demodulator, setting the sampling time and the sampling interval of the demodulator to be consistent with those of the thermometer, and automatically storing data into a database;
s5: after continuous measurement for a period of time, the traction rope, the linear temperature sensor array and the thermometer are taken out from the hard pipe, and temperature data and corresponding wavelength data are respectively derived from databases of the thermometer and the demodulator;
s6: and fitting the temperature-wavelength data by adopting Origin software to obtain a temperature characteristic curve corresponding to each grating of the linear temperature sensor array.
The calibration device and the method of the linear temperature sensor have the following beneficial effects:
1) Linear calibration, high precision:
the device fixes the fiber grating linear sensor through the traction rope, so that the fiber grating linear sensor is in a straightening state and is not affected by stress. Meanwhile, a plurality of high-precision platinum thermometers are matched and fixed with independent gratings of the fiber grating linear sensor, the fiber grating linear sensor is used for measuring the water environment temperature of the grating to be calibrated, the calibration environment is similar to the actual linear application occasion in height, and the calibration precision is high.
2) And (3) calibrating in batches, namely, unattended operation:
and the sampling frequency and sampling time of the set temperatures of the high-precision platinum thermometers are matched and fixed with the independent gratings of the fiber grating linear sensor, so that the water environment temperature at the corresponding grating is obtained. The fiber grating demodulator is used for setting the wavelength sampling frequency and sampling time of the fiber grating to be the same as those of the thermometer. The data can be automatically recorded at the same time during calibration, and the data can be exported and processed only after the calibration is finished, so that the batch calibration of a plurality of gratings on the fiber bragg grating linear sensor can be realized without watching by people.
3) The device is simple, and a heating device is not needed:
the plastic pipe is used for storing water to provide a calibration environment, the water environment temperature in the plastic pipe is changed through external environment such as sunlight irradiation, and an additional heating device is not needed to change the water temperature, so that the whole calibration device is simpler.
Drawings
FIG. 1 is a calibration device for a linear temperature sensor array according to the present invention.
In fig. 1: 1 is a demodulator; 2 is a linear temperature sensor array; 3 is a traction rope; 4 is a hard tube; 5 is a fixing ribbon; 6 is a sensor; 7 is a thermometer; 8 is a liquid heat conducting medium; 9 is a fixing frame; 10 is a counterweight.
Detailed Description
As shown in fig. 1, a calibration device of a linear temperature sensor comprises a hard tube 4, a linear temperature sensor array 2, a thermometer 7, a demodulator 1 and a fixing frame 9.
The bottom end of the hard pipe 4 is sealed and is provided with a valve, and the top end of the hard pipe is open; the hard tube 4 is vertically fixed by the fixing frame 9;
the hard tube 4 is filled with a liquid heat conducting medium 8;
one end of the linear temperature sensor array 2 is freely placed downwards along the opening at the top end of the hard tube 4, and the other end of the linear temperature sensor array 2 is connected to the demodulator 1;
the thermometer 7 is fixed in parallel with the sensing points on the linear temperature sensor array 2.
The liquid heat conducting medium 8 is water or oil, the temperature of which is changed by the ambient temperature outside the rigid tube 4.
The linear temperature sensor array 2 is a fiber bragg grating array.
The device also comprises a traction rope 3, wherein the traction rope 3 is fixed with the linear temperature sensor array 2, and a balancing weight 10 is hung at the free end of the traction rope 3 and used for keeping the plumb state of the traction rope 3.
The traction rope 3 and the linear temperature sensor array 2 can be fixed in a segmented mode through the fixing ribbon 5, and the traction rope is used for guiding the linear temperature sensor array to be calibrated to be vertically arranged in the hard tube 4, so that the linear temperature sensor array 2 is not affected by stress.
The 7 platinum electronic thermometer of the thermometer adopts an integrated airtight package for setting a sampling time interval, the absolute measurement precision is 0.01 ℃, and the reaction time is better than 0.1 seconds.
The demodulator 1 is a fiber grating demodulator, the scanning wavelength step is smaller than 4 pm, the wavelength stability is better than 0.1 pm, and the demodulation time of the grating array is smaller than 0.1 second. The data may be automatically collected after the sampling interval is set and stored in a database.
The hard tube 4 is a plastic tube.
A temperature calibration method of a linear temperature sensor comprises the following steps:
s1: and fixing the plastic pipe on the fixing frame, closing the bottom valve, and injecting liquid heat conducting medium. One end of the traction rope is tied with a balancing weight, and the linear sensor array to be calibrated is fixed with the traction rope;
s2: and after the waterproof covers of the plurality of high-precision integrated platinum thermometers are opened, the platinum thermometers are connected with a computer to set temperature sampling time and interval. After the arrangement is finished, fixing the thermometer on a traction rope and ensuring that the probe of the thermometer is the same as the grating position on the linear sensor array to be calibrated;
s3: and (3) placing the traction rope together with the linear sensor to be calibrated and the thermometer into the plastic pipe until the weight on the traction rope approaches the bottom of the plastic pipe, and fixing the traction rope on the top of the plastic pipe.
S4: connecting the other end of the fiber grating linear sensor with a fiber grating demodulator, setting the sampling time and interval of the fiber grating demodulator to be consistent with those of a platinum thermometer, and automatically storing the data into a database.
S5: after continuous measurement for a period of time, the hauling rope, the optical fiber array sensor and the platinum thermometer are taken out of the plastic pipe. Temperature data and corresponding wavelength data are derived from databases of a platinum thermometer and a fiber bragg grating demodulator, respectively.
S6: and fitting the temperature-wavelength data by adopting Origin software to obtain temperature characteristic curves corresponding to all gratings of the fiber grating linear sensor.
Aiming at the problem of calibration of the existing sensor array, the invention provides a temperature calibration method of a linear temperature sensor, and the sensor is not affected by stress by fixing a fiber bragg grating linear sensor with a traction rope. A plurality of high-precision platinum thermometers are fixed on a traction rope to enable the positions of the platinum thermometers to be the same as the positions of the fiber bragg grating linear sensors to be calibrated, and the temperature measured by the sensors is guaranteed to be consistent with the ambient temperature where the thermometers are located. The plastic pipe is vertically fixed on the fixing frame, and the pipe orifice plastic pipe is filled with water to simulate the temperature measuring environment in actual still water. The temperature in the plastic tube is changed by the temperature of the external environment. The fixed fiber bragg grating linear sensor and the thermometer are placed into the plastic pipe together with the traction rope, so that the fiber bragg grating linear sensor is ensured to be in a state of being straightened and not stressed in the calibration process. The batch calibration of gratings on the fiber grating linear sensor can be realized. The calibration device and the calibration method of the linear temperature sensor, disclosed by the invention, solve the problems of low precision, poor consistency, easiness in being influenced by stress and the like of the traditional calibration method, have the advantages of high calibration precision, stress-free calibration, high efficiency and the like, and have important application value in the calibration of the linear temperature sensor array.
In summary, the calibration device and the calibration method for the linear temperature sensor array, disclosed by the invention, overcome the problems of low precision, poor consistency, easiness in being influenced by bending stress and the like of the traditional calibration method, and have important application value in calibrating the high-precision fiber bragg grating temperature sensor.
Claims (6)
1. A calibration method of a linear temperature sensor is characterized in that: the method is based on a calibration device of a linear temperature sensor, and the calibration device comprises a hard tube (4), a linear temperature sensor array (2), a thermometer (7), a demodulator (1) and a fixing frame (9);
the bottom end of the hard pipe (4) is sealed and is provided with a valve, and the top end of the hard pipe is open; the hard tube (4) is vertically fixed by the fixing frame (9);
the hard tube (4) is filled with a liquid heat conducting medium (8);
one end of the linear temperature sensor array (2) is freely placed downwards along an opening at the top end of the hard tube (4), and the other end of the linear temperature sensor array (2) is connected with the demodulator (1);
the thermometer (7) is fixed in parallel with the sensing points on the linear temperature sensor array (2);
the device further comprises a traction rope (3), wherein the traction rope (3) is fixed with the linear temperature sensor array (2), and a balancing weight (10) is hung at the free end of the traction rope (3) and used for keeping the plumb state of the traction rope (3); the traction rope (3) and the linear temperature sensor array (2) are fixed in a segmented manner by a fixing ribbon (6) and are used for guiding the linear temperature sensor array to be calibrated to be vertically arranged in the hard tube (4);
the temperature calibration method of the linear temperature sensor based on the calibration device comprises the following steps:
s1: fixing the hard tube (4) on a fixing frame (9), keeping the hard tube (4) and the ground to be filled directly, closing a bottom valve, injecting a liquid heat conducting medium (8), bolting a balancing weight (10) on one end of the hauling rope (3), and fixing the linear sensor array to be calibrated with the hauling rope (3);
s2: connecting a plurality of high-precision thermometers (7) with a computer, setting temperature sampling time and interval, fixing the thermometers (7) on a traction rope (3) after setting, and ensuring that the probe of the thermometers is the same as the grating position on a linear sensor array to be calibrated;
s3: placing the hauling cable (3) together with the linear sensor to be calibrated and the thermometer (7) into the hard tube (4) until the balancing weight (10) on the hauling cable (3) approaches the bottom of the hard tube (4), and fixing the hauling cable (3) at the top of the hard tube (4);
s4: connecting the other end of the linear temperature sensor array (2) with a fiber bragg grating demodulator, setting the sampling time and interval of the demodulator (1) to be consistent with those of a thermometer (7), and automatically storing data into a database;
s5: after continuous measurement for a period of time, the haulage rope (3), the linear temperature sensor array (2) and the thermometer (7) are taken out of the hard pipe (4), and temperature data and corresponding wavelength data are respectively derived from databases of the thermometer (7) and the demodulator (1);
s6: and fitting the temperature-wavelength data to obtain temperature characteristic curves corresponding to the gratings of the linear temperature sensor array (2).
2. The method for calibrating a linear temperature sensor according to claim 1, wherein: the liquid heat conducting medium (8) is water or oil.
3. The method for calibrating a linear temperature sensor according to claim 1, wherein: the linear temperature sensor array (2) is a fiber bragg grating array.
4. The method for calibrating a linear temperature sensor according to claim 1, wherein: the thermometer (7) is a platinum electronic thermometer, and is integrally sealed and packaged for setting a sampling time interval.
5. The method for calibrating a linear temperature sensor according to claim 1, wherein: the demodulator (1) is a fiber grating demodulator.
6. The method for calibrating a linear temperature sensor according to claim 1, wherein: the hard pipe (4) is a plastic pipe.
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| CN110411609A (en) * | 2019-02-14 | 2019-11-05 | 辽宁达能电气股份有限公司 | A kind of distributed optical fiber temperature measurement on-line calibration device and calibration method |
| CN110319951A (en) * | 2019-07-18 | 2019-10-11 | 华北电力科学研究院有限责任公司 | The temperature monitoring system and method for enclosed busbar |
| CN110285892A (en) * | 2019-08-02 | 2019-09-27 | 北京市人工影响天气办公室 | Cloud chamber temperature monitoring system, temperature detection part and its production and scaling method |
| CN111426410B (en) * | 2020-04-24 | 2024-07-30 | 武汉雷施尔光电信息工程有限公司 | Calibration device and method for multi-measuring-point fiber grating high-temperature sensor |
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