CN115585910A - 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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- 239000013307 optical fiber Substances 0.000 title claims abstract description 83
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 63
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- 238000001069 Raman spectroscopy Methods 0.000 claims description 13
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- 238000004321 preservation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000013475 authorization Methods 0.000 description 2
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- 230000003287 optical effect Effects 0.000 description 2
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- 229920000742 Cotton Polymers 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000004861 thermometry Methods 0.000 description 1
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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 in that the temperature calibration system comprises the following steps: the temperature calibration device comprises a fan, a radiator, a temperature control source and a constant temperature bin, wherein 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 thermostatic chamber and configured to obtain a calibrated temperature in the thermostatic chamber; the temperature control plate is connected with the temperature sensor through a first lead wire and acquires the temperature detected by the temperature sensor, and the temperature control plate is connected with the temperature control source through a second lead 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 temperature field distribution 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 device emits laser pulses with a certain wavelength into an optical fiber, and a laser pulse technical signal is usually accompanied by raman scattering automatically in the forward propagation process to generate two raman scattering light waves with inconsistent wavelengths. The intensity of the Raman scattering light wave is affected by the temperature of the scattering point position of the optical fiber, and then a backward 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 scattering point of the optical fiber is demodulated. Meanwhile, according to the relation between the transmission speed of the laser pulse in the optical fiber and the time, the positioning processing can be carried out on the position of the scattering point.
In the process of demodulating Raman scattered light, the distributed optical fiber temperature measurement system needs to convert optical signals into electric signals through an avalanche diode and simultaneously utilizes an acquisition card to carry out signal acquisition. 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 errors. Therefore, a constant reference temperature is needed to perform temperature calibration on the temperature field along the optical fiber measured by the system in the distributed optical fiber temperature measurement process. This function is realized with the constant temperature water tank usually in the laboratory, but when the in-service use, the constant temperature water tank not only has the space to occupy great, and weight is heavier, and temperature variation speed is slower, and the inhomogeneous scheduling problem of temperature distribution, and safety problems such as weeping need be considered, can't install inside the temperature measurement host computer.
The invention discloses a distributed optical fiber temperature measurement intelligent monitoring system, which is disclosed in Chinese patent with an authorization notice number of CN112595434B and an authorization notice date of 2021, 11.5.11.3, and 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 connected with the local monitoring center, and the local monitoring center and the cloud monitoring center interact data; 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 a uniform access platform for 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 a uniform access platform for different application scenes, and the acquisition of parameters and related data corresponding to the corresponding application scenes from the cloud monitoring center according to the application scenes specifically means that the application scene operation prediction function module acquires the application scenes of the temperature measurement optical fibers, and the application scenes comprise the application of the temperature measurement optical fibers in power cable distributed temperature measurement, distributed fire detection and data center environment temperature detection; transmitting an application scene of temperature measurement optical fibers to a cloud monitoring center, if the application scene is applied to distributed temperature measurement of a power cable, acquiring parameters and data required for power cable current-carrying capacity evaluation from the cloud monitoring center, if the application scene is applied to distributed fire detection, acquiring parameters and data required for fire alarm evaluation from the cloud monitoring center, and if the application scene is applied to distributed fire detection, acquiring parameters and data required for data center environment evaluation and feedback control from the cloud monitoring 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 sheath of the cable. It also suffers from the drawbacks of the distributed fiber optic thermometry systems described above.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a calibration method for a temperature calibration system of 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 calibration method of a temperature calibration system for a distributed optical fiber temperature measurement system is characterized in that the temperature calibration system comprises:
the temperature calibration device comprises a fan, a radiator, a temperature control source and a constant temperature bin, wherein 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 thermostatic chamber and configured to obtain a calibrated temperature in the thermostatic chamber; and
the temperature control plate is connected with the temperature sensor through a first lead wire and acquires the temperature detected by the temperature sensor, and the temperature control plate is connected with the temperature control source through a second lead wire;
the distributed optical fiber temperature measurement system comprises a temperature measurement unit, wherein the temperature measurement unit is configured to be used for detecting the temperature in the constant temperature bin;
the temperature T measured by the distributed optical fiber temperature measurement system before calibration is
Wherein, T 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.DELTA.v is the Raman shift of the fiber molecule, which has a value of 13.2THz s And P as The light intensities of Stokes light and anti-Stokes light generated by Raman scattering in the temperature measuring unit are respectively;
temperature Tc after calibration
Wherein, T3 and T4 are the temperatures of the two thermostats measured by the two temperature sensors, β is the attenuation coefficient, and L is the distance between the two temperature calibration devices.
The temperature calibration device comprises a temperature calibration device body, a temperature calibration device and a slide rail, wherein the temperature calibration device body is provided with a plurality of temperature calibration devices, the temperature calibration devices are arranged on the slide rail respectively, and the distance between the two temperature calibration devices is adjusted through directional movement on the slide rail.
The temperature control source is a semiconductor refrigerating 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 interior 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 insulation layer to seal the opening.
The constant temperature bin comprises a cover body and a main body portion, wherein the cover body is arranged on the main body portion, the opening is formed in the main body portion, and the heat insulation layer only covers the inner wall of the main body portion.
The radiator comprises a substrate and a plurality of fins arranged on the substrate, wherein the semiconductor refrigeration sheet is respectively attached to the substrate and a cover body of the constant temperature bin to form a conducting 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 refrigeration piece and is connected with the locking part surrounding the constant temperature bin.
In the embodiment of the invention, heat conducting glue is respectively arranged between the substrate and the semiconductor refrigerating sheet and 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 measurement system demodulates a temperature signal to the temperature measured by the temperature measurement 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 two temperature measuring units between the constant temperature bins, and performing 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 measurement device has the advantages of small volume, light weight, no liquid inside, independence from the existence of a distributed optical fiber temperature measurement system, capability of being installed inside the temperature measurement host machine and being installed outside the temperature measurement host machine, and more flexible use.
2. The semiconductor refrigeration piece is used as a temperature control source, and the constant-temperature bin can be heated and refrigerated through the temperature control plate, so that the temperature control precision of the constant-temperature bin is improved.
3. The design that adopts fastening unit and constant temperature storehouse, convenient dismantlement and installation make things convenient for arranging of constant temperature storehouse content, and single constant temperature storehouse is inside can to place many temperature measurement light and calibrate.
4. The slide 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 and improve the calibration precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
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 in an embodiment of the invention.
Fig. 3 is a schematic perspective view of a heat sink in an embodiment of the invention.
Fig. 4 is a schematic perspective view of a thermostatic chamber in an embodiment of the present invention.
Fig. 5 is a perspective view of a locking portion in the 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 flowchart of a calibration method of a temperature calibration system for a distributed optical fiber temperature measurement system according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The 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 following directions such as "axial direction", "above", "below", etc. are for more clearly showing the structural positional relationship and are not intended to limit the present invention. In the present invention, the terms "vertical", "horizontal" and "parallel" are defined as: including ± 10% of cases based on the standard definition. For example, vertical generally refers to an angle of 90 degrees relative to a reference line, but in the present invention, vertical refers to a situation within 80 to 100 degrees inclusive.
Referring to fig. 1 to 7, the calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system of the present embodiment includes a temperature control plate 1, a temperature calibration device 7, and a temperature sensor (not shown).
The temperature calibration devices 7 in this embodiment are provided in two sets, an adjustable distance is provided between the two sets of temperature calibration devices 7, the temperature calibration devices 7 include a fan 101, a heat sink 102, a temperature control source 103, and a constant temperature chamber 104, the fan 101 is disposed on the heat sink 102, the temperature control source 103 is disposed on the other side of the heat sink 102 opposite to the fan 101, and at least a portion of a housing of the constant temperature chamber 104 is in thermal contact with the temperature control source 103. In this embodiment, the temperature control source 103 can heat or cool to maintain the temperature control accuracy of the constant temperature chamber 104.
The temperature sensor in this embodiment is disposed in the thermostatic chamber 104 and configured to obtain a calibrated temperature in the thermostatic chamber 104. The temperature sensor is an NTC temperature-sensitive resistance sensor in the prior art.
In this embodiment, the temperature control plate 1 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 temperature control source 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 the voltage in the second wire 2 is controlled by the temperature of the thermostatic chamber 104 fed back to control the power of the temperature control source 103, so that the temperature of the thermostatic chamber 104 is stabilized near a set value.
The distributed optical fiber temperature measurement system in this embodiment includes a temperature measurement unit 4, and the temperature measurement unit 4 is configured to be used for detecting the temperature in the constant temperature chamber 104. The basic structure and principle of the distributed optical fiber temperature measurement system are the prior art, and are not described herein again.
The temperature T measured by the distributed optical fiber temperature measurement system before calibration is
Wherein, T 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 Planckian constant, h =6.62606896 × 10 -34 J.s.DELTA.v is the Raman shift of the fiber molecule, with a value of 13.2THz s And P as The light intensities of Stokes light and anti-Stokes light generated by Raman scattering in the temperature measuring unit are respectively;
temperature T after calibration c Is composed of
Wherein T3 and T4 are the temperatures of the two thermostats measured by the two temperature sensors, β is the attenuation coefficient, and L is the distance between the two temperature calibration devices 7.
The temperature calibration device comprises a slide rail 6, two temperature calibration devices 7 are respectively arranged on the slide rail 6, and the distance between the two temperature calibration devices 7 is adjusted through directional movement on the slide rail 6. And the temperature calibration device 7 may be fixed on the slide rail 6 by bolts so that its position is fixed.
In this embodiment, the temperature control source 103 is a semiconductor refrigeration chip, which is a prior art and is not described herein again.
The temperature measuring unit 4 of 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 to the optical fiber FC interface flange 502, and one end of the optical fiber 5 is connected to the inside of the constant temperature chamber 104. The temperature measuring unit 4 may further include a connector 503 for connecting the optical fiber FC interface flange 502 and the optical fiber 5.
The interface board 501 of the temperature measuring unit 4 can be fixed to the distributed optical fiber temperature measuring system by a fixed angle code 504.
In this embodiment, an opening 302 is formed in the thermostatic chamber 104, the optical fiber and the first wire 3 enter the thermostatic chamber 104 through the opening 302, and an insulating layer is formed in the thermostatic chamber 104 to seal the opening 302. In other words, the opening 302 is thermally isolated from the outside by the insulating layer. The heat-insulating layer can be made of heat-insulating cotton.
In this embodiment, the constant temperature chamber 104 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 heat insulating layer only covers the inner wall of the main body 301, but does not cover the cover 303, so that the heat exchange between the inside of the constant temperature chamber 104 and the temperature control source 103 is realized through the cover 303. The cover 303 is screwed to the main body 301 for easy removal.
In this embodiment, the heat sink 102 includes a base 202 and a plurality of fins 201 disposed on the base 202, and the semiconductor chilling plates are respectively attached to the base 202 and the cover 303 of the thermostatic chamber 104 to form a conductive path.
In this embodiment, the temperature calibration device 7 includes a fastening unit 105, and the fastening unit includes a fastening member and a locking portion, and the fastening member sequentially passes through the substrate 202 and the semiconductor chilling plate, and is connected to the locking portion surrounding the constant temperature compartment 104.
The base 202 is provided with a round hole 203, the locking part is provided with a fixing hole 401, and the fastener passes through the fixing hole 401 and the round hole 203 and then is locked by a nut, so as to fasten the radiator 102, the temperature control source 103 and the constant temperature chamber 104.
In this embodiment, heat conducting glue is respectively disposed between the substrate 202 and the semiconductor chilling plate, and between the semiconductor chilling plate and the cover 303. When the fastening unit 105 is fastened, the heat-conducting glue between the substrate 202 and the semiconductor cooling plate and between the semiconductor cooling plate and the cover 303 is sufficiently squeezed to ensure a sufficient heat-conducting area, thereby improving the heat-conducting efficiency.
The calibration method in this embodiment includes the following steps:
the pulse laser signals of the distributed optical fiber temperature measurement system are subjected to temperature demodulation operation through back Raman heat dissipation echoes generated by the temperature measurement unit 4, temperature signals are demodulated, the temperature sensors feed back the measured calibration temperatures of the two constant temperature bins 104 to the temperature control plate 1, and the temperature signals are calibrated for one time;
and reading the distance between the temperature measuring units 4 between the two constant temperature bins 104, and performing secondary calibration on the temperature measuring error 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 above description of the present invention is intended to be illustrative. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A calibration method of a temperature calibration system for a distributed optical fiber temperature measurement system is characterized in that the temperature calibration system comprises:
the temperature calibration device comprises a fan, a radiator, a temperature control source and a constant temperature bin, wherein 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 thermostatic chamber and configured to obtain a calibrated temperature in the thermostatic chamber; and
the temperature control plate is connected with the temperature sensor through a first lead wire and acquires the temperature detected by the temperature sensor, and the temperature control plate is connected with the temperature control source through a second lead wire;
the distributed optical fiber temperature measurement system comprises a temperature measurement unit, wherein the temperature measurement unit is configured to be used for detecting the temperature in the constant temperature bin;
the temperature T measured by the distributed optical fiber temperature measurement system before calibration is
Wherein, T 0 At room temperature, k is boltzmann constant, k =1.38.65.5 × 10 -23 J/K, T is Kelvin absolute temperature, in K, h is Planckian constant, h =6.62606896 × 10 -34 J.s.DELTA.v is the Raman shift of the fiber molecule, which has a value of 13.2THz s And P as The light intensities of Stokes light and anti-Stokes light generated by Raman scattering in the temperature measuring unit are respectively;
temperature Tc after calibration
Wherein, T3 and T4 are the temperatures of the two thermostats measured by the two temperature sensors, β is the attenuation coefficient, and L is the distance between the two temperature calibration devices.
2. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 1, wherein: the temperature calibration device comprises a slide rail, two temperature calibration devices are respectively arranged on the slide rail, and the distance between the two temperature calibration devices is adjusted through directional movement on the slide rail.
3. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 1, wherein: the temperature control source is a semiconductor refrigerating sheet.
4. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 3, wherein: 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.
5. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 4, wherein: the constant temperature cabin is provided with an opening, the optical fiber and the first lead enter the constant temperature cabin through the opening, and a heat insulation layer is arranged in the constant temperature cabin to seal the opening.
6. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 5, wherein: the constant temperature bin comprises a cover body and a main body portion, the cover body is arranged on the main body portion, the opening is formed in the main body portion, and the heat preservation layer only covers the inner wall of the main body portion.
7. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 3, wherein: the radiator comprises a base and a plurality of fins arranged on the base, and the semiconductor refrigeration piece is respectively attached to the base and the cover body of the constant-temperature bin to form a conducting path.
8. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 7, wherein: the temperature calibration device comprises a fastening unit, the fastening unit comprises a fastening piece and a locking part, and the fastening piece sequentially penetrates through the substrate and the semiconductor refrigeration piece and is connected with the locking part surrounding the constant temperature bin.
9. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 8, 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.
10. The calibration method of the temperature calibration system for the distributed optical fiber temperature measurement system according to claim 1, wherein: the calibration method comprises the following steps:
the distributed optical fiber temperature measurement system demodulates a temperature signal to the temperature measured by the temperature measurement 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 two temperature measuring units between the two constant temperature bins, and performing 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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| CN117007198A (en) * | 2023-06-19 | 2023-11-07 | 深圳阿珂法先进科技有限公司 | Temperature point detection method and temperature measurement system for bearing bush of power generation equipment |
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