CN111122007B - Distributed Shan Mola Mantemperature measuring device with self-calibration function - Google Patents
Distributed Shan Mola Mantemperature measuring device with self-calibration function Download PDFInfo
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- 239000000835 fiber Substances 0.000 claims abstract description 79
- 239000013307 optical fiber Substances 0.000 claims abstract description 50
- 230000003287 optical effect Effects 0.000 claims description 86
- 238000001069 Raman spectroscopy Methods 0.000 claims description 20
- 238000009529 body temperature measurement Methods 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 9
- 238000001259 photo etching Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 241000357437 Mola Species 0.000 claims 3
- 238000004321 preservation Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing 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
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
-
- 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
- G01K15/005—Calibration
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a distributed Shan Mola Mans accurate temperature measuring device with a self-calibration function, wherein the output end of a pulse light source is connected with the input end of a erbium-doped fiber amplifier A, the output end of the erbium-doped fiber amplifier A is connected with the input end of a fiber grating filter, the output end of a scanning light source is connected with the input end of a erbium-doped fiber amplifier B, and the output end of the erbium-doped fiber amplifier B is connected with the input end of a C-band filter. The invention combines the distributed optical fiber sensing technology and the point type optical fiber sensing technology, can realize the long-distance monitoring of the distributed optical fiber sensing, and utilizes the point type optical fiber sensing technology to calibrate the temperature, thereby ensuring that the distributed Shan Mola man device can accurately measure the temperature for a long time.
Description
Technical Field
The invention relates to a temperature measuring device, in particular to a distributed Shan Mola Mans accurate temperature measuring device with a self-calibration function.
Background
The distributed optical fiber temperature sensing technology is to measure the temperature field distribution in continuous space of tens of kilometers along the optical fiber. Although the distributed optical fiber temperature sensing technology can measure the temperature distribution of long-distance optical fibers, the temperature measurement is not very accurate, and the temperature measurement has accumulated errors along with the accumulation of measurement time. The point type temperature sensor can only test the temperature state in the area near one point, is not suitable for monitoring long-distance temperature distribution, but has high temperature measuring precision.
With the popularization of intelligent monitoring of infrastructure, submarine cables, communication optical cables, high-voltage cables and the like can utilize a single-mode fiber to perform temperature test on the cables so as to monitor the states of the cables in the operation process. The conventional distributed single-mode fiber temperature measuring device can accumulate along with the monitoring time, and the temperature measuring accuracy of the device can be reduced. Especially at the end of the cable, the temperature can change more dramatically. Therefore, a distributed Shan Mola man temperature measuring device capable of calibrating the temperature periodically is needed to ensure that the equipment operates for a long time, and the temperature monitoring does not have accumulated errors and can not generate false alarms.
The patent of the distributed Shan Mola Raman accurate temperature measuring device currently comprises a China patent with application number 201810077167.6, which is applied in 2018, 1 and 26, and a distributed optical fiber temperature measuring device based on a single-mode optical fiber Raman scattering effect. And China patent No. 201910144287.8, filed on 27 days of 2 months in 2019, is a distributed single-mode fiber ultra-long distance Raman temperature measurement sensor. However, the existing distributed Shan Mola Mans temperature measuring device has no function of self-calibrating temperature.
Disclosure of Invention
The invention aims to provide a distributed Shan Mola Mans accurate temperature measuring device with a self-calibration function, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The distributed Shan Mola Man accurate temperature measurement device with self-calibration function, the output end of the pulse light source is connected with the input end of the erbium-doped fiber amplifier A for amplifying pulse light, the output end of the erbium-doped fiber amplifier A is connected with the input end of the fiber grating filter for filtering noise outside the bandwidth of the filter, the output end of the scanning light source is connected with the input end of the erbium-doped fiber amplifier B for amplifying scanning light, the output end of the erbium-doped fiber amplifier B is connected with the input end of the C-band filter for limiting the wavelength of scanning light to 1520-1570nm, the output end of the C-band filter is connected with the input end of the 99:1 coupler, Dividing scanning light into two paths, connecting the output end of the fiber bragg grating filter with the input port of the optical switch A, connecting the 99:1 coupler with the 99% coupling ratio of the output end of the 99:1 coupler with the input port of the optical switch A, switching pulse light and scanning light by using the optical switch A, connecting the output end of the optical switch A with the circulator, injecting the pulse light or the scanning light into an optical fiber, connecting the circulator with the input end of the reference optical fiber, photoetching the fiber bragg grating sensor A at the middle position of the reference optical fiber for calibrating the temperature of the reference optical fiber in the equipment, placing the reference optical fiber in the heat-preserving box, The reference optical fiber output end is connected with the input end of the measuring optical fiber, the optical fiber grating sensor B and the optical fiber grating sensor C are respectively photoetched near the starting position and the cut-off position of the measuring optical fiber, the circulator is also connected with the input end of the optical switch B, the reflected pulse light is output through the optical switch B, the reflected scanning light is output through the optical switch B, the 99:1 coupler coupling ratio is that the 1% output end is connected with the input end of the optical etalon for generating a standard spectrum to carry out wavelength resolving reference, the output end of the optical etalon is connected with the input end of the photoelectric detector A for carrying out photoelectric conversion on the standard spectrum, The number output port of the optical switch B is connected with the input port of the photoelectric detector B to perform photoelectric conversion on the measured fiber bragg grating spectrum, the output port of the photoelectric detector A and the output port of the photoelectric detector B are respectively connected with the dual-channel acquisition card to acquire and preprocess data, and the optical switch B is connected with the optical switch 50:50 the input port of the coupler is connected to split the measured raman back-scattered light into two paths, said 50: an output port of a 50 coupler is connected to an input port of said 1450nm wavelength division multiplexer, said 50: the other output port of the 50 coupler is connected with the input port of the 1663nm wavelength division multiplexer, For frequency-selecting light with wavelength of 1450nm and 1663nm, the output port of 1450nm wavelength division multiplexer is connected with the input port of 1450nm filter for increasing signal-to-noise ratio for 1450nm wavelength Raman anti-Stokes light, the output port of 1663nm wavelength division multiplexer is connected with the input port of 1663nm filter for increasing signal-to-noise ratio for 1663nm wavelength Raman Stokes light, the output port of 1450nm filter and the output port of 1663nm filter are respectively connected with the input port of double-channel avalanche diode photoelectric detector, The output ports of the two-way avalanche diode photoelectric detector are respectively connected with the input ends of the two-way acquisition card B for acquiring two electric signals, the two-way acquisition card A and the two-way acquisition card B are connected with the computer through a network cable for synchronously controlling the two acquisition cards, transmitting data and resolving data, the two-way acquisition card B is connected with the optical switch A and the optical switch B for synchronously controlling the two optical switches to switch, when a first input port of the optical switch A passes through pulse light, an output port of the optical switch B passes through back scattering Raman light, and when a second input port of the optical switch A passes through scanning light, The optical switch B also reflects light back through the fiber grating.
As a further aspect of the invention: the optical switch A adopts a multi-channel optical switch.
As a further aspect of the invention: the optical switch B adopts a multi-channel optical switch.
As a further aspect of the invention: the positions of the fiber grating sensor B and the fiber grating sensor C can be interchanged.
As a further aspect of the invention: the number of the fiber bragg grating sensors B and the fiber bragg grating sensors C is 1 or more.
As a further aspect of the invention: and photoetching the fiber grating from the head to the tail of the measuring fiber.
As a further aspect of the invention: the control of the optical switch A and the optical switch B is controlled by the serial port for the computer.
Compared with the prior art, the invention has the beneficial effects that: 1. the distributed Shan Mola Mans accurate temperature measuring device with the self-calibration function can realize long-distance accurate temperature measurement. The accuracy of each temperature calibration can reach 0.1 ℃. 2. The distributed Shan Mola-man accurate temperature measuring device with the self-calibration function can ensure the accuracy of long-time temperature measurement and temperature measurement. 3. The distributed Shan Mola-mann accurate temperature measuring device with the self-calibration function can measure long-distance temperature distribution and accurate temperature measurement of the point temperature measuring sensor by using the distributed optical fiber sensing system, and the advantages of the distributed Shan Mola-mann accurate temperature measuring device are selected and effectively fused. 4. The distributed Shan Mola-man accurate temperature measuring device with the self-calibration function has the advantages that the repetition frequency of the fiber grating demodulation system is 2.5kHz, the time for each calibration is shorter, and the measurement time of the distributed single-mode Raman is not influenced.
Drawings
Fig. 1 is a block diagram of the present invention.
In the figure: the pulse light source-1, the erbium-doped fiber amplifier A-2, the fiber grating filter-3, the scanning light source-4, the erbium-doped fiber amplifier B-5, the C wave band filter-6, the 99:1 coupler-7, the optical switch A-8, the circulator-9, the thermal insulation box-10, the fiber grating sensor A-11, the fiber grating sensor B-12, the fiber grating sensor C-13, the reference fiber-14, the measuring fiber-15, the optical switch B-16, the optical etalon-17, the photoelectric detector A-18, the photoelectric detector B-19, the dual-channel acquisition card A-20, the 50:50 coupler-21, the 1450nm wavelength division multiplexer-22, the 1663nm wavelength division multiplexer-23, the 1450nm filter-24, the 1663nm filter-25, the dual-channel diode photoelectric detector-26, the dual-channel acquisition card B-27 and the computer-28.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 1, in the embodiment of the invention, a distributed Shan Mola man-made accurate temperature measurement device with self-calibration function includes a pulse light source 1, a erbium-doped fiber amplifier A2, a fiber grating filter 3, a scanning light source 4, a erbium-doped fiber amplifier B5, a C-band filter 6, a 99:1 coupler 7, an optical switch A8, a circulator 9, a thermal insulation box 10, a fiber grating sensor a11, a fiber grating sensor B12, a fiber grating sensor C13, a reference fiber 14, a measurement fiber 15, an optical switch B16, an optical etalon 17, a photodetector a18, a photodetector B19, a dual-channel acquisition card a20, a 50:50 coupler 21, a 1450nm wavelength division multiplexer 22, a 1663nm wavelength division multiplexer 23, a 1450nm filter 24, a 1663nm filter 25, a dual-channel avalanche diode photodetector 26, a dual-channel acquisition card B27, and a computer 28.
The output end of the pulse light source 1 is connected with the input end of the erbium-doped fiber amplifier A2 and is used for amplifying pulse light.
The output end of the erbium-doped fiber amplifier A2 is connected with the input end of the fiber grating filter 3 and is used for filtering noise outside the bandwidth of the filter so as to improve the signal-to-noise ratio.
The output end of the scanning light source 4 is connected with the input end of the erbium-doped fiber amplifier B5, and is used for amplifying scanning light.
The output end of the erbium doped fiber amplifier B5 is connected with the input end of the C-band filter 6, and is used for limiting the scanning light wavelength to 1520-1570 nm.
The output end of the C-band filter 6 is connected with the input end of the 99:1 coupler 7, so that scanning light is divided into two paths.
The output end of the fiber grating filter 3 is connected with the input port 1 (upper line connection in the figure) of the optical switch A8, and the coupling ratio of the 99:1 coupler 7 is that 99% of the output end is connected with the input port 2 (lower line connection in the figure) of the optical switch A8. The pulse light and the scanning light are switched by an optical switch A8.
The output end of the optical switch A8 is connected to the 1 port (left side in the drawing) of the circulator 9, and pulse light or scanning light is injected into the optical fiber.
The 2 port (right side in the figure) of the circulator 9 is connected with the input end of the reference optical fiber 14, and the intermediate position of the reference optical fiber 14 is used for photoetching the fiber bragg grating sensor A11 for calibrating the temperature of the reference optical fiber in the equipment. The reference fiber is placed in the incubator 10.
The output end of the reference optical fiber 14 is connected with the input end of the measuring optical fiber 15, and the vicinity of the starting position and the cut-off position of the measuring optical fiber 15 are respectively subjected to photoetching of the fiber grating sensor B12 and the fiber grating sensor C13.
The 3 port (lower side in the figure) of the circulator 9 is connected to the input terminal of the optical switch B16, and outputs the reflected pulse light through the 1 port of the optical switch B16 and the reflected scanning light through the 2 port of the optical switch B16.
The 99:1 coupler 7 has a 1% output coupled to the input of the optical etalon 17 for generating a standard spectrum for wavelength resolved reference.
The output end of the optical etalon 17 is connected with the input end of the photoelectric detector A18, and photoelectric conversion is carried out on a standard spectrum.
And the No.2 output port of the optical switch B16 is connected with the input port of the photoelectric detector B19, and performs photoelectric conversion on the measured fiber bragg grating spectrum.
The output port of the photoelectric detector A18 and the output port of the photoelectric detector B19 are respectively connected with the dual-channel acquisition card 20 to acquire and preprocess data.
And the No. 1 output port of the optical switch B16 is connected with the input port of the 50:50 coupler 21, so that the measured Raman back scattered light is divided into two paths.
One output port of the 50:50 coupler 21 is connected to an input port of the 1450nm wavelength division multiplexer 22, and the other output port of the 50:50 coupler 21 is connected to an input port of the 1663nm wavelength division multiplexer 23. For frequency-selective light of 1450nm and 1663nm wavelengths.
The reflection port of the 1450nm wavelength division multiplexer 22 is circled, and the output port of the 1450nm wavelength division multiplexer 22 is connected with the input port of the 1450nm filter 24, so as to improve the signal to noise ratio for the 1450nm wavelength raman anti-stokes light.
The reflection port of the 1663nm wavelength division multiplexer 23 is circled, and the output port of the 1663nm wavelength division multiplexer 23 is connected with the input port of the 1663nm filter 25 for improving signal-to-noise ratio for 1663nm wavelength raman stokes light.
The output port of the 1450nm filter 24 and the output port of the 1663nm filter 25 are respectively connected with the input port of the two-way avalanche diode photodetector 26 for photoelectric conversion of weaker signals.
The output ports of the two-way avalanche diode photoelectric detector 26 are respectively connected with the input ends of the two-way acquisition card B27 and are used for acquiring two electrical signals.
The two-channel acquisition card A20 and the two-channel acquisition card B27 are connected with the computer 28 through a network cable and used for synchronous control of the two acquisition cards, data transmission and data calculation.
The dual-channel acquisition card B27 is connected with the optical switch A8 and the optical switch B16 and is used for controlling synchronous switching of the two optical switches. When the input 1 port of the optical switch A8 passes the pulsed light, the output 1 port of the optical switch B16 passes the backscattered raman light. When the input 2 port of the optical switch A8 passes the scanning light, the output 2 port of the optical switch B16 reflects the light back through the fiber grating.
Example 2: based on example 1: the optical switches A8 and B16 can be multi-channel optical switches. The system thus enables multi-channel measurements.
Example 3: based on example 1: the positions of the fiber grating sensor B12 and the fiber grating sensor C13 can be changed or increased, so that the temperature of the calibration measurement optical cable can be more accurate.
Example 4: based on example 1: the optical fiber grating is required to be photoetched at the head and the tail of the measuring optical fiber 15, and in actual operation, the optical fiber grating sensor with two ends can be welded to the measuring optical fiber.
Example 5: based on example 1: the control of the optical switches A8 and B16 may be controlled by the serial port for a computer.
Example 5: based on example 1: the 50: the 50 coupler 21 aliquotes the reflected raman back-scattered light, which reduces the light intensity. The 50: and a 50 coupler 21, which connects the input end of the 1450nm wavelength division multiplexer 22 with the No. 1 output end of the optical switch B, and connects the reflection port of the 1450nm wavelength division multiplexer 22 with the input port of the 1663nm wavelength division multiplexer 23, so that the light intensity is improved, and the signal to noise ratio is improved.
The temperature measurement step of the invention is specifically as follows:
The light of the pulse light source enters the erbium-doped fiber amplifier 1 for amplification. And step two, filtering the noise outside the bandwidth of the amplified pulse light through a fiber grating filter. And thirdly, the light of the scanning light source enters the erbium-doped fiber amplifier 2 for amplification. And step four, the amplified scanning light passes through a C-band filter, and the wavelength of the scanning light is limited to 1520-1570 nm. And fifthly, switching the pulse light and the scanning light through the optical switch A, wherein only one light passes at a certain moment. Step six, the fiber enters the reference fiber through the 1 st output port of the circulator. And seventhly, photoetching a fiber bragg grating sensor A at the middle position of the reference optical fiber, and calibrating the temperature of the reference optical fiber in the equipment. And step eight, injecting the light of the reference optical fiber into the measuring optical fiber. And step nine, photoetching a fiber grating sensor B and a fiber grating sensor C at the head and the tail of the measuring fiber, and calibrating the temperature of the measuring fiber. And step nine, inputting the back-facing Raman scattering signals or the light reflected back by the fiber bragg grating through a2 nd port of the circulator, and outputting the back-facing Raman scattering signals or the light reflected back by the fiber bragg grating through a3 rd port. And step ten, switching the back Raman scattering signal and the light reflected by the fiber bragg grating through an optical switch B. Step eleven, 99: the 1 coupler couples 1% of the light through the optical etalon to obtain the standard spectrum. And step twelve, carrying out photoelectric conversion on a standard spectrum through a photoelectric detector A. And thirteen, the light reflected by the fiber bragg grating passes through a photoelectric detector B to be subjected to photoelectric conversion. Fourteen, acquiring data of two channels through the two-channel acquisition card A. Fifteen, through 50: the 50 coupler divides the back raman scattered optical power equally. Sixteenth, separating Stokes light and anti-Stokes light by 1450nm optical fiber wavelength division multiplexer and 1663nm optical fiber wavelength division multiplexer. Seventeen, filtering through 1450nm filter and 1663nm filter respectively. Eighteenth, the optical signal is converted into an electric signal by using a double-channel avalanche diode photoelectric detector. Nineteenth, collecting signals through a two-channel collecting card. And twenty, transmitting the data acquired by the two-channel acquisition card A and the two-channel acquisition card B to a computer through a network cable for data processing. And step eleven, synchronous switching control is carried out on the optical switch A and the optical switch B through the double-channel acquisition card B.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. The distributed Shan Mola Man temperature measuring device with the self-calibration function is characterized in that the output end of a pulse light source (1) is connected with the input end of a erbium-doped optical fiber amplifier A (2) and used for amplifying pulse light, the output end of the erbium-doped optical fiber amplifier A (2) is connected with the input end of a fiber grating filter (3) and used for filtering noise outside the bandwidth of the filter, the output end of a scanning light source (4) is connected with the input end of a erbium-doped optical fiber amplifier B (5) and used for amplifying scanning light, the output end of the erbium-doped optical fiber amplifier B (5) is connected with the input end of a C-band filter (6) and used for limiting the scanning light to 1520-1570, The output end of the C-band filter (6) is connected with the input end of a 99:1 coupler (7) to divide scanning light into two paths, the output end of the fiber grating filter (3) is connected with an optical switch A (8), the 99:1 coupler (7) is connected with the optical switch A (8) at the coupling ratio of 99 percent, the optical switch A (8) is used for switching pulse light and scanning light, the output end of the optical switch A (8) is connected with a circulator (9) to inject the pulse light or the scanning light into an optical fiber, the circulator (9) is also connected with the input end of a reference optical fiber (14), the middle position of the reference optical fiber (14) is used for photoetching the fiber grating sensor A (11), The device is used for calibrating the temperature of a reference optical fiber in equipment, the reference optical fiber is arranged in a heat preservation box (10), the output end of the reference optical fiber (14) is connected with the input end of a measuring optical fiber (15), a fiber grating sensor B (12) and a fiber grating sensor C (13) are respectively photoetched near the starting position and the cut-off position of the measuring optical fiber (15), the circulator (9) is also connected with the input end of an optical switch B (16), reflected pulse light is output through the optical switch B (16), reflected scanning light is output through the optical switch B (16), the coupling ratio of the 99:1 coupler (7) is that the output end of 1 percent is connected with the input end of an optical standard tool (17), The optical etalon is used for generating a standard spectrum for wavelength resolving reference, the output end of the optical etalon (17) is connected with the input end of the photoelectric detector A (18) for photoelectric conversion of the standard spectrum, the No. 2 output port of the optical switch B (16) is connected with the input port of the photoelectric detector B (19) for photoelectric conversion of the measured fiber bragg grating spectrum, and the output port of the photoelectric detector A (18) and the output port of the photoelectric detector B (19) are respectively connected with the dual-channel acquisition card A (20) for data acquisition and pretreatment, and the optical switches B (16) and 50: the input port of the 50 coupler (21) is connected, splitting the measured raman back-scattered light into two paths, 50: an output port of a 50 coupler (21) is connected to an input port of a 1450nm wavelength division multiplexer (22), said 50: the other output port of the 50 coupler (21) is connected with the input port of a 1663nm wavelength division multiplexer (23) for frequency-selecting light with wavelengths of 1450nm and 1663nm, the output port of the 1450nm wavelength division multiplexer (22) is connected with the input port of a 1450nm filter (24) for improving the signal-to-noise ratio for the 1450nm wavelength Raman anti-Stokes light, the output port of the 1663nm wavelength division multiplexer (23) is connected with the input port of a 1663nm filter (25) for improving signal to noise ratio for 1663nm wavelength Raman Stokes light, the output port of the 1450nm filter (24) and the output port of the 1663nm filter (25) are respectively connected with the input port of a double-channel avalanche diode photoelectric detector (26) for photoelectric conversion of weaker signals, the output port of the double-channel avalanche diode photoelectric detector (26) is respectively connected with the input end of a double-channel acquisition card B (27) for acquisition of two paths of electric signals, The dual-channel acquisition card A (20) and the dual-channel acquisition card B (27) are connected with a computer (28) through a network cable and are used for synchronous control of the two acquisition cards, data transmission and data calculation, the dual-channel acquisition card B (27) is connected with the optical switch A (8) and the optical switch B (16) and is used for controlling synchronous switching of the two optical switches, when a first input port of the optical switch A (8) passes through pulse light, the optical switch B (16) passes through back scattering Raman light, and when a second input port of the optical switch A (8) passes through scanning light, the optical switch B (16) also reflects light back through a fiber grating; The optical switch A (8) and the optical switch B (16) are both multichannel optical switches.
2. The self-calibrating distributed Shan Mola Manter temperature measurement device according to claim 1, wherein the positions of the fiber grating sensor B (12) and the fiber grating sensor C (13) can be interchanged.
3. The self-calibrating distributed Shan Mola Manter temperature measurement device according to claim 2, wherein the number of fiber grating sensors B (12) and fiber grating sensors C (13) is 1 or more.
4. The self-calibrating distributed Shan Mola Manter temperature measuring device according to claim 1, wherein the head and tail of the measuring fiber (15) are lithographically fiber gratings.
5. The self-calibrating distributed Shan Mola mann temperature measuring device according to claim 1, wherein the control of the optical switch a (8) and the optical switch B (16) is controlled by the serial port for the computer.
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