CN115585910B - Calibration method of temperature calibration system for distributed optical fiber temperature measurement system - Google Patents
Calibration method of temperature calibration system for distributed optical fiber temperature measurement system Download PDFInfo
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Abstract
The invention provides a calibration method of a temperature calibration system for a distributed optical fiber temperature measurement system, which is characterized by comprising the following steps: the temperature calibration device is provided with two groups, an adjustable interval is arranged between the two groups of temperature calibration devices, the temperature calibration device comprises a fan, a radiator, a temperature control source and a constant temperature bin, the fan is arranged on the radiator, the temperature control source is arranged on the other side of the radiator opposite to the fan, and at least one part of a shell of the constant temperature bin is in thermal contact with the temperature control source; a temperature sensor disposed within the constant temperature bin and configured to obtain a calibrated temperature in the constant temperature bin; the temperature control plate is connected with the temperature sensor through a first wire, acquires the temperature detected by the temperature sensor, and is connected with the temperature control source through a second wire; the distributed optical fiber temperature measurement system comprises a temperature measurement unit.
Description
Technical Field
The invention relates to a calibration method of a temperature calibration system for a distributed optical fiber temperature measurement system, and belongs to the field of optical fiber temperature measurement.
Background
A distributed optical fiber temperature measurement technology system is a technology for acquiring the distribution of a temperature field along an optical fiber based on a Raman scattering principle and an optical time domain reflection technology. In a distributed optical fiber temperature measurement system, a laser emits laser pulse with a certain wavelength into an optical fiber, and a laser pulse technical signal usually automatically generates Raman scattering in the forward propagation process to generate two Raman scattering light waves with inconsistent wavelengths. The intensity of the raman scattered light wave is generally changed to a proper extent due to the temperature influence of the position of the optical fiber scattering point, and then the back raman light wave signal returned in the optical fiber scattering process is captured and analyzed by the photoelectric converter, so that the temperature condition of the optical fiber scattering point is demodulated. Meanwhile, according to the relation between the transmission speed of the laser pulse in the optical fiber and time, the position of the scattering point can be unfolded and positioned.
In the process of demodulating the Raman scattered light, the distributed optical fiber temperature measurement system needs to convert an optical signal into an electric signal through an avalanche diode, and meanwhile, the acquisition card is used for signal acquisition work. However, in the practical application process, the accuracy of the avalanche diode and the acquisition card is limited, and the demodulated temperature has larger fluctuation and error. Therefore, a constant reference temperature is required in the distributed optical fiber temperature measurement process to calibrate the temperature of the optical fiber measured by the system along the temperature field. The constant temperature water tank is used for realizing the function in a laboratory generally, but in actual use, the constant temperature water tank not only has the problems of large space occupation, heavy weight, low temperature change speed, uneven temperature distribution and the like, but also needs to consider the safety problems of liquid leakage and the like, and cannot be installed inside a temperature measuring host.
The invention discloses a distributed optical fiber temperature measurement intelligent monitoring system in China patent number CN112595434B, the date of the grant is 2021, 11 and 5, which comprises a plurality of temperature measurement optical fibers, an optical fiber temperature measurement host, a local monitoring center and a cloud monitoring center, wherein the optical fiber temperature measurement host comprises an optical fiber wavelength division multiplexing coupler, a pulse laser light source, a signal acquisition processor and a photoelectric detector, the temperature measurement optical fibers are connected with the optical fiber wavelength division multiplexing coupler, the optical fiber wavelength division multiplexing coupler is respectively connected with the pulse laser light source and the photoelectric detector, the photoelectric detector is connected with the signal acquisition processor, the signal acquisition processor is linked with the local monitoring center, and the local monitoring center is in data interaction with the cloud monitoring center; the optical fiber temperature measurement functional module comprises a parameter configuration unit, a temperature acquisition and calculation unit, an alarm processing unit, a data storage unit and a data communication unit; the application scene operation prediction function module provides unified access platforms of different application scenes, and acquires parameters and related data corresponding to the corresponding application scenes from the cloud monitoring center according to the application scenes to construct an application scene operation prediction model; the application scene operation prediction function module provides unified access platforms of different application scenes, and the method specifically refers to the steps that the application scene operation prediction function module obtains the application scene of the temperature measuring optical fiber according to parameters and related data corresponding to the application scene obtained from the cloud monitoring center, wherein the application scene comprises the application of the temperature measuring optical fiber to power cable distributed temperature measurement, distributed fire detection and data center environment temperature detection; transmitting an application scene of the temperature measuring optical fiber to a cloud monitoring center, acquiring parameters and data required by current carrying capacity evaluation of the power cable from the cloud monitoring center if the application scene is applied to distributed temperature measurement of the power cable, acquiring parameters and data required by fire alarm evaluation from the cloud monitoring center if the application scene is applied to distributed fire detection, and acquiring parameters and data required by environment evaluation and feedback control of the data center from the cloud monitoring center if the application scene is applied to environment temperature detection of the data center. The distributed optical fiber temperature measurement intelligent monitoring system is the typical distributed optical fiber temperature measurement system and is used for monitoring the temperature of the cable sheath. It also suffers from the aforementioned drawbacks of distributed fiber optic thermometry systems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a calibration method of a temperature calibration system for a distributed optical fiber temperature measurement system.
The technical scheme adopted by the embodiment of the invention for solving the problems is as follows: a method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system, the method comprising:
the temperature calibration device is provided with two groups, an adjustable interval is arranged between the two groups of temperature calibration devices, the temperature calibration device comprises a fan, a radiator, a temperature control source and a constant temperature bin, the fan is arranged on the radiator, the temperature control source is arranged on the other side of the radiator opposite to the fan, and at least one part of a shell of the constant temperature bin is in thermal contact with the temperature control source;
a temperature sensor disposed within the constant temperature bin and configured to obtain a calibrated temperature in the constant temperature bin; and
the temperature control plate is connected with the temperature sensor through a first wire, acquires the temperature detected by the temperature sensor, and is connected with the temperature control source through a second wire;
the distributed optical fiber temperature measurement system comprises a temperature measurement unit, wherein the temperature measurement unit is configured to detect the temperature in the constant temperature bin;
the temperature T before calibration measured by the distributed optical fiber temperature measurement system is
Wherein T is 0 At room temperature, k is boltzmann constant, k= 1.3806505 ×10 -23 J/K, T is kelvin absolute temperature in K, h is planck constant, h= 6.62606896 ×10 -34 J.s, deltav is the Raman frequency shift of the fiber molecule, which is 13.2THz, P s And P as Respectively the light intensities of Stokes light and anti-Stokes light generated by Raman scattering in the temperature measuring unit;
the temperature Tc after calibration is
Wherein T3 and T4 are temperatures of the two thermostats measured by the two temperature sensors, beta is an attenuation coefficient, and L is a distance between the two temperature calibration devices.
The embodiment of the invention further comprises a sliding rail, wherein the two temperature calibration devices are respectively arranged on the sliding rail, and the distance between the two temperature calibration devices is adjusted through directional movement on the sliding rail.
The temperature control source in the embodiment of the invention is a semiconductor refrigeration sheet.
The temperature measuring unit comprises an interface board, an optical fiber FC interface flange and an optical fiber, wherein the optical fiber FC interface flange is arranged on the interface board, the optical fiber is connected with the optical fiber FC interface flange, and one end of the optical fiber is connected with the inside of the constant temperature bin.
According to the embodiment of the invention, the constant temperature bin is provided with the opening, the optical fiber and the first lead enter the constant temperature bin through the opening, and the constant temperature bin is internally provided with the heat preservation layer so as to seal the opening.
The constant temperature bin comprises a cover body and a main body, wherein the cover body is arranged on the main body, the open hole is formed in the main body, and the heat preservation layer only covers the inner wall of the main body.
The radiator provided by the embodiment of the invention comprises a substrate and a plurality of fins arranged on the substrate, wherein the semiconductor refrigerating sheet is respectively attached to the substrate and the cover body of the constant temperature bin to form a conduction path.
The temperature calibration device comprises a fastening unit, wherein the fastening unit comprises a fastening piece and a locking part, and the fastening piece sequentially penetrates through the substrate and the semiconductor refrigerating sheet and is connected with the locking part encircling the constant temperature bin.
In the embodiment of the invention, the heat-conducting glue is respectively arranged between the substrate and the semiconductor refrigerating sheet as well as between the semiconductor refrigerating sheet and the cover body.
The calibration method provided by the embodiment of the invention comprises the following steps:
the distributed optical fiber temperature measuring system demodulates a temperature signal from the temperature measured by the temperature measuring unit, and the temperature sensor feeds back the measured calibration temperature to the temperature control plate and performs primary calibration on the temperature signal;
and reading the distance between the temperature measuring units between the two constant temperature bins, and carrying out secondary calibration on temperature measuring errors caused by the distance between the temperature measuring units in the distributed optical fiber temperature measuring system according to the distance value and the corresponding light intensity attenuation.
Compared with the prior art, the invention has one or more of the following advantages or effects:
1. the temperature measuring device has the advantages of small volume, light weight, no liquid in the temperature measuring device, independent of the existence of the distributed optical fiber temperature measuring system, and more flexible use, and can be installed in the temperature measuring host and outside the temperature measuring host.
2. The semiconductor refrigerating sheet is used as a temperature control source, and the temperature control plate can heat the constant temperature bin and perform refrigerating operation on the constant temperature bin, so that the temperature control precision of the constant temperature bin is improved.
3. The design of fastening unit and constant temperature storehouse is adopted, convenient dismantlement and installation, and convenient constant temperature storehouse content's arrangement can place many temperature measurement light and calibrate in the single constant temperature storehouse.
4. The sliding rail is adopted to connect the two constant temperature bins, and the temperature difference and the interval between the constant temperature bins are utilized to realize the secondary temperature calibration with attenuation compensation, thereby improving the calibration precision.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic perspective view of a temperature calibration system according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a temperature calibration device according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a radiator according to an embodiment of the invention.
Fig. 4 is a schematic perspective view of a thermostatic cartridge according to an embodiment of the present invention.
Fig. 5 is a schematic perspective view of a locking portion according to an embodiment of the present invention.
Fig. 6 is a schematic perspective view of a temperature measuring unit according to an embodiment of the present invention.
FIG. 7 is a flow chart of a method of calibrating a temperature calibration system for a distributed fiber temperature measurement system in accordance with an embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. The directions such as "axial direction", "above", "below", etc. are hereinafter for the sake of clarity of the structural positional relationship, and are not limiting of the present invention. In the present invention, the terms "vertical", "horizontal", "parallel" are defined as: including + -10% cases based on standard definition. For example, vertical generally refers to an included angle of 90 degrees with respect to the reference line, but in the present invention, vertical refers to a case including 80 degrees to 100 degrees or less.
Referring to fig. 1 to 7, the calibration method of the temperature calibration system for a distributed optical fiber temperature measurement system of the present embodiment includes a temperature control board 1, a temperature calibration device 7, and a temperature sensor (not shown).
The temperature calibration device 7 in this embodiment is provided with two groups, an adjustable distance is arranged between the two groups of temperature calibration devices 7, the temperature calibration device 7 comprises a fan 101, heat sinks 102, wen Kongyuan and a constant temperature bin 104, the fan 101 is arranged on the heat sink 102, wen Kongyuan of the Wen Kongyuan is arranged on the other side of the heat sink 102 opposite to the fan 101, and at least a part of a shell of the constant temperature bin 104 is in thermal contact with the Wen Kongyuan of the heat sink 102. In this embodiment, the temperature control source 103 can heat or cool to maintain the temperature control accuracy of the constant temperature bin 104.
The temperature sensor in this embodiment is disposed within the constant temperature compartment 104 and configured to obtain a calibrated temperature in the constant temperature compartment 104. The temperature sensor is an NTC temperature-sensitive resistance sensor in the prior art.
The temperature control plate 1 in this embodiment is connected to the temperature sensor through a first wire 3, and obtains the temperature detected by the temperature sensor, and the temperature control plate 1 is connected to the Wen Kongyuan 103 through a second wire 2.
In this embodiment, the fan 101 rotates at a constant speed, the temperature control board 1 reads the temperature transmitted by the temperature sensor through the first wire 3, and meanwhile, the temperature of the constant temperature cabin 104 is stabilized near the set value by controlling the voltage in the second wire 2 through the temperature of the constant temperature cabin 104 fed back to control the power of the temperature control source 103.
The distributed optical fiber temperature measuring system in the embodiment comprises a temperature measuring unit 4, wherein the temperature measuring unit 4 is configured to detect the temperature in the constant temperature bin 104. The basic structure and principle of the distributed optical fiber temperature measurement system are the prior art, and are not described herein.
The temperature T before calibration measured by the distributed optical fiber temperature measurement system is
Wherein T is 0 At room temperature, k is boltzmann constant, k= 1.3806505 ×10 -23 J/K, T in (T) is kelvin absolute temperature in K, h is planck constant, h= 6.62606896 ×10 -34 J.s, deltav is the Raman shift of the fiber molecule, which is 13.2THz, P s And P as Respectively the light intensities of Stokes light and anti-Stokes light generated by Raman scattering in the temperature measuring unit;
post calibration temperature T c Is that
Wherein T3 and T4 are temperatures of the two thermostats measured by the two temperature sensors, beta is an attenuation coefficient, and L is a distance between the two temperature calibration devices 7.
The embodiment further comprises a sliding rail 6, two temperature calibration devices 7 are respectively arranged on the sliding rail 6, and the two temperature calibration devices 7 adjust the distance between the two temperature calibration devices through directional movement on the sliding rail 6. And the temperature calibration device 7 can be fixed on the slide rail 6 by bolts so that its position is fixed.
In this embodiment, wen Kongyuan is a semiconductor refrigeration sheet, which is a prior art, and will not be described herein.
The temperature measuring unit 4 in this embodiment includes an interface board 501, an optical fiber FC interface flange 502 and an optical fiber 5, where the optical fiber FC interface flange 502 is disposed on the interface board 501, the optical fiber is connected with the optical fiber FC interface flange 502, and one end of the optical fiber 5 is connected with the inside of the constant temperature cabin 104. The temperature measurement unit 4 may further comprise a connector 503 for connecting the fiber FC interface flange 502 and the optical fiber 5.
The interface board 501 of the temperature measurement unit 4 may be fixed to the distributed fiber optic temperature measurement system by a fixed angle code 504.
In this embodiment, an opening 302 is provided on the constant temperature bin 104, the optical fiber and the first wire 3 enter the constant temperature bin 104 through the opening 302, and an insulating layer is provided in the constant temperature bin 104 to seal the opening 302. In other words, the openings 302 are thermally isolated from the outside by the insulating layer. The heat-insulating layer can be made of heat-insulating cotton.
The constant temperature cabin 104 of this embodiment includes a cover 303 and a main body 301, the cover 303 is disposed on the main body 301, the opening 302 is disposed on the main body 301, and the insulating layer only covers the inner wall of the main body 301, but does not cover the cover 303, so that heat exchange between the cover 303 and the temperature control source 103 is realized inside the constant temperature cabin 104. The cover 303 is screwed with the main body 301 for easy detachment.
The heat sink 102 in this embodiment includes a base 202 and a plurality of fins 201 disposed on the base 202, and the semiconductor refrigeration sheets are respectively attached to the base 202 and a cover 303 of the constant temperature bin 104 to form a conductive path.
The temperature calibration device 7 in this embodiment includes a fastening unit 105, which includes a fastening member and a locking portion, where the fastening member sequentially passes through the base 202 and the semiconductor cooling fin, and is connected with the locking portion encircling the constant temperature bin 104.
The base 202 is provided with a round hole 203, the locking part is provided with a fixing hole 401, and a fastener passes through the fixing hole 401 and the round hole 203 and is locked by a nut so as to fasten the radiator 102, wen Kongyuan 103 and the constant temperature bin 104.
In this embodiment, heat-conducting glue is respectively disposed between the substrate 202 and the semiconductor cooling sheet, and between the semiconductor cooling sheet and the cover 303. When the fastening unit 105 is fastened, the heat-conducting glue between the base 202 and the semiconductor refrigeration sheet and between the semiconductor refrigeration sheet and the cover 303 is sufficiently pressed to ensure a sufficient heat-conducting area to improve heat-conducting efficiency.
The calibration method in this embodiment includes the following steps:
the pulse laser signal of the distributed optical fiber temperature measurement system carries out temperature demodulation operation on the back Raman heat radiation echo generated by the temperature measurement unit 4, and demodulates a temperature signal, and the temperature sensor feeds back the measured calibration temperatures of the two constant temperature bins 104 to the temperature control plate 1, and carries out primary calibration on the temperature signal;
and reading the distance between the temperature measuring units 4 between the two constant temperature bins 104, and performing secondary calibration on temperature measuring errors caused by the distance between the temperature measuring units 4 in the distributed optical fiber temperature measuring system according to the distance value and the corresponding light intensity attenuation.
The foregoing description of the invention is merely exemplary of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the scope of the invention as defined in the accompanying claims.
Claims (9)
1. A method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system, the method comprising:
the temperature calibration device is provided with two groups, an adjustable interval is arranged between the two groups of temperature calibration devices, the temperature calibration device comprises a fan, a radiator, a temperature control source and a constant temperature bin, the fan is arranged on the radiator, the temperature control source is arranged on the other side of the radiator opposite to the fan, and at least one part of a shell of the constant temperature bin is in thermal contact with the temperature control source;
a temperature sensor disposed within the constant temperature bin and configured to obtain a calibrated temperature in the constant temperature bin; and
the temperature control plate is connected with the temperature sensor through a first wire, acquires the temperature detected by the temperature sensor, and is connected with the temperature control source through a second wire;
the distributed optical fiber temperature measurement system comprises a temperature measurement unit, wherein the temperature measurement unit is configured to detect the temperature in the constant temperature bin;
the temperature measuring unit comprises an interface board, an optical fiber FC interface flange and an optical fiber, wherein the optical fiber FC interface flange is arranged on the interface board, the optical fiber is connected with the optical fiber FC interface flange, and one end of the optical fiber is connected with the inside of the constant temperature bin;
the temperature T before calibration measured by the distributed optical fiber temperature measurement system is
Wherein T is 0 At room temperature, k is boltzmann constant, k= 1.3806505 ×10 -23 J/K, T is kelvin absolute temperature in K, h is planck constant, h= 6.62606896 ×10 -34 J· s Deltav is the optical fiberRaman shift of the molecule, which has a value of 13.2THz, P s And P as Respectively the light intensities of Stokes light and anti-Stokes light generated by Raman scattering in the temperature measuring unit;
the temperature Tc after calibration is
Wherein T3 and T4 are temperatures of the two constant temperature bins measured by the two temperature sensors, beta is an attenuation coefficient, and L is a distance between the two temperature calibration devices.
2. The method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 1, wherein: the temperature calibration device comprises a sliding rail, and is characterized by further comprising two temperature calibration devices which are respectively arranged on the sliding rail and adjust the distance between the two temperature calibration devices through directional movement on the sliding rail.
3. The method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 1, wherein: the temperature control source is a semiconductor refrigerating sheet.
4. A method of calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 3, wherein: an opening is formed in the constant temperature bin, the optical fiber and the first lead enter the constant temperature bin through the opening, and a heat preservation layer is arranged in the constant temperature bin to seal the opening.
5. The method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 4, wherein: the constant temperature storehouse includes lid and main part, the lid set up in on the main part, and the trompil set up in the main part, the heat preservation only covers the inner wall department of main part.
6. A method of calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 3, wherein: the heat sink comprises a substrate and a plurality of fins arranged on the substrate, the semiconductor refrigerating sheet is respectively attached to the base and the cover body of the constant temperature bin to form a conduction path.
7. The method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 6, wherein: the temperature calibration device comprises a fastening unit, wherein the fastening unit comprises a fastening piece and a locking part, and the fastening piece sequentially penetrates through the substrate and the semiconductor refrigerating sheet and is connected with the locking part encircling the constant temperature bin.
8. The method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 7, wherein: and heat-conducting glue is respectively arranged between the substrate and the semiconductor refrigerating sheet and between the semiconductor refrigerating sheet and the cover body.
9. The method for calibrating a temperature calibration system for a distributed optical fiber temperature measurement system according to claim 1, wherein: the calibration method comprises the following steps:
the distributed optical fiber temperature measuring system demodulates a temperature signal from the temperature measured by the temperature measuring unit, and the temperature sensor feeds back the measured calibration temperature to the temperature control plate and performs primary calibration on the temperature signal;
and reading the distance between the temperature measuring units between the two constant temperature bins, and carrying out secondary calibration on temperature measuring errors caused by the distance between the temperature measuring units in the distributed optical fiber temperature measuring system according to the distance value and the corresponding light intensity attenuation.
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| CN101344440B (en) * | 2008-08-28 | 2012-03-21 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method |
| CN203422175U (en) * | 2013-07-31 | 2014-02-05 | 北京航空航天大学 | Distributed fiber temperature measuring experiment apparatus capable of realizing parameter calibration and automatic calibration |
| CN204964071U (en) * | 2015-07-29 | 2016-01-13 | 宁波东方之光安全技术有限公司 | Portable optic fibre calibration device |
| US10845221B2 (en) * | 2016-06-27 | 2020-11-24 | Omnisens Sa | Calibration device for distributing sensing technologies |
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| CN108458814B (en) * | 2018-07-09 | 2019-10-08 | 太原理工大学 | Self calibration detection device and temperature demodulation method towards fiber Raman temperature-sensing system |
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| CN111141413B (en) * | 2019-12-26 | 2020-11-10 | 武汉新楚电力集团有限公司 | Distributed optical fiber temperature measurement system and method based on double-end temperature calibration |
| CN112595434B (en) * | 2020-12-30 | 2021-11-05 | 广州旭杰电子有限公司 | Distributed optical fiber temperature measurement intelligent monitoring system |
| CN113654683B (en) * | 2021-08-16 | 2023-12-05 | 许昌许继软件技术有限公司 | Calibration method and device for distributed optical fiber temperature measurement system |
| CN114674463A (en) * | 2022-03-14 | 2022-06-28 | 中国科学技术大学 | Distributed optical fiber temperature sensing calibration unit, sensing device and detection method |
| CN114942087B (en) * | 2022-04-29 | 2024-06-25 | 合肥师范学院 | Raman Stokes light intensity dynamic self-calibration distributed temperature detection system and method |
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