Solution to the problem of excessive loss of distributed temperature measurement optical fiber in double-end measurement

Abstract

The present invention relates to a solution to the problem of excessive loss of distributed temperature measurement optical fiber during double-end measurement. It solves the problem of inaccurate temperature measurement accuracy of distributed optical fiber in the prior art. It includes S1, marking the temperature of the first and last ends of the distributed temperature measurement optical fiber in the initial state; S2, setting an annular temperature measurement interval in the main temperature measurement channel to detect the temperature transmission change; S3, setting a temperature rise noise detection device in each annular temperature measurement interval in the main temperature measurement channel and the slave temperature measurement channel to detect the temperature rise noise at the beginning and end of the annular temperature measurement interval; S4, setting a temperature rise noise alarm value; S5, synthesizing the data of the main temperature measurement channel and the slave temperature measurement channel as the new channel temperature and comparing it with the temperature noise alarm value; S6, setting a temperature compensation component in the annular temperature measurement interval to compensate for the temperature attenuation of the distributed temperature measurement optical fiber in the alarm area. The advantages of the present invention are: effectively reducing the noise at the tail of the optical fiber, allowing the equipment to measure temperature normally, and extending the service life of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of temperature measuring optical fibers, and in particular to a solution to the problem of excessive loss of distributed temperature measuring optical fibers during double-end measurement. Background Art

[0002] Distributed fiber optic temperature measurement realizes temperature monitoring based on the principle of optical time domain reflection and the sensitivity of Raman scattering effect to temperature. Among them, in the double-end measurement technology, the temperature-sensitive optical fiber is measured in a loop wiring manner, that is, the optical fiber is wired from the main channel, then goes back to the host, and then connected to the optical fiber from the slave channel. However, the spatial resolution of the existing distributed optical fiber temperature measurement system is large, the positioning accuracy is insufficient, and the temperature measurement accuracy is not high; at the same time, under normal circumstances, the temperature is measured using the data of the main channel. When a fiber break occurs, the data of the main channel and the slave channel are combined into one channel to avoid the inability to measure the temperature of the optical fiber behind the fiber break point due to fiber break. However, this method has too much fiber loss, and due to the excessive length of the temperature-sensitive optical fiber or the insufficient power of the host device, it is easy to cause the temperature data collected by the temperature-sensitive optical fiber to have too much noise at the tail of the optical fiber, that is, the temperature value has a large range, which will cause temperature misreporting or inaccurate temperature measurement accuracy, affecting the temperature measurement effect.

[0003] In order to solve the shortcomings of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a distributed optical fiber temperature measurement system using fiber Bragg grating temperature compensation [CN201620887389.0], which uses a fiber Bragg grating sensor to perform temperature compensation on the distributed optical fiber temperature measurement system. Compared with the existing distributed optical fiber temperature measurement system, the temperature measurement accuracy is higher, combining the advantages of both the fiber Bragg grating sensing system and the distributed optical fiber temperature measurement system.

[0004] The above scheme has solved the problem of large spatial resolution and insufficient positioning accuracy of the distributed optical fiber temperature measurement system in the prior art to a certain extent. However, the scheme still has many shortcomings. For example, excessive optical fiber loss leads to large upper and lower ranges of temperature values, which can easily lead to false temperature alarms or inaccurate temperature measurement accuracy, affecting the temperature measurement effect. Summary of the invention

[0005] The purpose of the present invention is to provide a solution to the problem of excessive loss of distributed temperature measurement optical fiber during double-end measurement in view of the above problem.

[0006] To achieve the above object, the present invention adopts the following technical solution: a solution to the excessive loss of distributed temperature measurement optical fiber during double-end measurement, the method comprises the following steps:

[0007] S1, marking the temperature of the head end and tail end of the distributed temperature measurement optical fiber in the initial state;

[0008] S2. An annular temperature measurement interval is set in the main temperature measurement channel to detect the temperature transmission change of the distributed temperature measurement optical fiber in each annular temperature measurement interval;

[0009] S3, setting a temperature rise noise detection device in each annular temperature measurement interval in the temperature measurement main channel and the temperature measurement slave channel to detect the temperature rise noise at the beginning and end of the annular temperature measurement interval;

[0010] S4. Set the temperature rise noise alarm value;

[0011] S5, synthesizing the data of the temperature measurement main channel and the temperature measurement slave channel as a new channel temperature and comparing it with the temperature noise alarm value;

[0012] S6. A temperature compensation component is arranged in the annular temperature measurement interval to perform temperature attenuation compensation on the distributed temperature measurement optical fiber in the alarm area.

[0013] In step S1, a constant temperature device is set at both ends of the distributed temperature measurement optical fiber, and a first temperature measurement module and a second temperature measurement module are respectively set at both ends of the distributed temperature measurement optical fiber, the constant temperature device is connected to a temperature control module for adjusting the temperature, and the first temperature measurement module and the second temperature measurement module are respectively connected to temperature displays.

[0014] In step S2, the annular temperature measurement interval is arranged corresponding to the distributed temperature measurement optical fiber node in the temperature measurement main channel, and a plurality of equidistantly arranged temperature measurement ring bodies are arranged in the annular temperature measurement interval. The circumference of the temperature measurement ring body is connected to the circumference of the distributed temperature measurement optical fiber through a plurality of temperature measuring rods, and an isothermal ring is arranged in the temperature measurement ring body to obtain the average temperature value of the temperature detected in the circumference of the distributed temperature measurement optical fiber, and the isothermal rings located in the same temperature measurement main channel are connected by a heat equalizing wire arranged along the axial direction of the temperature measurement main channel, the isothermal ring has an external wireless positioning module and a built-in temperature rise timing module, and the wireless positioning module and the temperature rise timing module are connected to the channel control module.

[0015] Step S3 specifically includes the following steps:

[0016] S21, performing temperature detection on the circumference of the distributed temperature measurement optical fiber through a temperature measurement rod;

[0017] S22, using the temperature measuring ring to obtain the average circumferential temperature of the distributed temperature measuring optical fiber;

[0018] S23, the heat-saturating wire conducts the temperature of the temperature measuring ring body to the adjacent temperature measuring ring body;

[0019] S24, the temperature rise timing module detects the temperature transmission change.

[0020] Step S24 specifically includes the following steps:

[0021] S241, the temperature rise timing module performs daily temperature status monitoring;

[0022] S242, when the temperature exceeds the set value and is detected to be conducted toward the adjacent temperature measuring ring body, the temperature rise timing module starts timing;

[0023] S243: When the duration of abnormal temperature conduction is longer than the set safety time value, a current position abnormality warning is issued to the channel control module through the positioning module.

[0024] In step S3, the temperature rise noise detection device uses the temperature rise noise data in the temperature measurement main channel to obtain the first temperature point exceeding the noise alarm threshold set in step S4 and uses this temperature point as the active channel merging point to synthesize the temperature measurement main channel and the temperature measurement slave channel data as new channel temperature data.

[0025] In step S3, the temperature rise noise data acquisition of the temperature rise noise detection device includes the following steps:

[0026] S31, setting the latest temperature curve L1, and setting the previous temperature curve to L2;

[0027] S32, set the historical average temperature data bit n;

[0028] S32, setting the interval number to m;

[0029] Among them, 1<=m<=3 and 7<=n<=12;

[0030] The temperature rise noise data curve is: Lt=L1-(Lm+2+Lm+3+...+Lm+1+n) / n.

[0031] In step S5, when a fiber break occurs, the previous temperature point exceeding the set noise threshold of the temperature measurement main channel and the temperature measurement slave channel is calculated respectively, and the following operations are performed after the calculation is completed:

[0032] ① If the temperature of the temperature point where the fiber is broken is greater than the preset temperature noise alarm value, the splicing will be normal;

[0033] ② If the temperature of the temperature point where the fiber is broken is lower than the preset temperature noise alarm value, the data after this temperature point will be discarded.

[0034] And, the temperature measurement is performed in the same way from channel 2.

[0035] In step S6, the temperature compensation component includes a photoelectric detection module, and the photoelectric detection module is connected to an optical signal modulation host for compensating the intensity of the optical signal.

[0036] Step S6 specifically includes the following steps:

[0037] S61, using a photoelectric detection module to detect distributed temperature measurement optical fiber attenuation point data;

[0038] S62, obtaining the anti-Stokes signal and the Stokes signal of the distributed temperature measurement optical fiber at the point, and drawing a light intensity ratio curve of the anti-Stokes light and the Stokes light;

[0039] S63, the light intensity ratio curve is segmented according to the attenuation point data;

[0040] S64, performing piecewise polynomial fitting according to the segmented information, and defining the fitted data as the baseline data of the system at the current temperature;

[0041] S65. The optical signal modulation host performs temperature compensation on the temperature attenuation point of the distributed temperature measurement optical fiber according to the baseline data at the current temperature.

[0042] Compared with the existing technology, the advantages of the present invention are: in the case of no channel fiber breakage, dual-end temperature measurement uses the temperature data of the main channel. When the noise of the main channel is too large, it will affect the temperature measurement effect. Through the method of synthesizing temperature at the noise zero boundary point, the part of the main channel that exceeds the noise alarm value is synthesized by the data of the slave channel, which effectively reduces the noise at the tail of the optical fiber, enables the equipment to measure temperature normally, and thus extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of the method of the present invention;

[0044] Figure 2 It is a connection relationship diagram between the temperature measurement main channel and the temperature measurement slave channel in the present invention;

[0045] Figure 3 It is a cross-sectional view of the temperature measuring ring in the present invention;

[0046] Figure 4 It is a distribution diagram of the temperature measuring ring body in the annular temperature measuring interval of the present invention;

[0047] Figure 5 It is a local structure connection block diagram of the present invention;

[0048] Figure 6 This is a block diagram of the connection between the head and tail ends of the distributed temperature measurement optical fiber in the present invention;

[0049] In the figure, there are a main temperature measurement channel 1, an annular temperature measurement interval 11, a slave temperature measurement channel 2, a distributed temperature measurement optical fiber 3, a constant temperature device 31, a first temperature measurement module 32, a temperature control module 34, a temperature display 35, a temperature measurement ring body 4, a temperature measurement rod 41, an isothermal ring 42, a heating wire 43, a wireless positioning module 44, a temperature rise timing module 45, a channel control module 46, a temperature compensation component 5, a photoelectric detection module 51, and an optical signal mediation host 52. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figure 1-6 As shown, a solution to the problem of excessive loss of distributed temperature measurement optical fiber during double-end measurement is provided. The method includes the following steps:

[0052] S1, marking the temperatures of the head end and the tail end of the distributed temperature measurement optical fiber 3 in the initial state;

[0053] S2, setting an annular temperature measurement interval 11 in the temperature measurement main channel 1 to detect the temperature transmission change of the distributed temperature measurement optical fiber 3 in each annular temperature measurement interval 11;

[0054] S3, a temperature rise noise detection device is provided in each annular temperature measurement interval 11 in the temperature measurement main channel 1 and the temperature measurement slave channel 2 to detect the temperature rise noise at the beginning and end of the annular temperature measurement interval 11;

[0055] S4. Set the temperature rise noise alarm value;

[0056] S5, synthesizing the data of the temperature measurement main channel 1 and the temperature measurement slave channel 2 as the new channel temperature and comparing it with the temperature noise alarm value;

[0057] S6. A temperature compensation component 5 is arranged in the annular temperature measurement interval 11 to perform temperature attenuation compensation on the distributed temperature measurement optical fiber 3 in the alarm area.

[0058] In step S1, a constant temperature device 31 is set at both ends of the distributed temperature measurement optical fiber 3, and a first temperature measurement module 32 and a second temperature measurement module 33 are respectively set at both ends of the distributed temperature measurement optical fiber 3, the constant temperature device 31 is connected to a temperature control module 34 for adjusting the temperature, and the first temperature measurement module 32 and the second temperature measurement module 33 are respectively connected to a temperature display 35.

[0059] The first temperature measuring module 32 and the second temperature measuring module 33 detect the temperatures at both ends of the distributed temperature measuring optical fiber 3, and ensure the daily detection temperature difference at both ends of the distributed temperature measuring optical fiber 3 through the constant temperature device 31. Secondly, in order to ensure the precision of the measurement, the temperature control module 34 is used to adjust the constant temperature of the temperature at both ends of the distributed temperature measuring optical fiber 3 according to the detected ambient temperature.

[0060] In step S2, the annular temperature measurement interval 11 is arranged corresponding to the nodes of the distributed temperature measurement optical fiber 3 in the temperature measurement main channel 1, and a plurality of equidistantly arranged temperature measurement ring bodies 4 are arranged in the annular temperature measurement interval 11. The temperature measurement ring body 4 is circumferentially connected to the distributed temperature measurement optical fiber 3 through a plurality of temperature measuring rods 41, and an isothermal ring 42 is arranged in the temperature measurement ring body 4 to obtain the average temperature value of the temperature detected circumferentially by the distributed temperature measurement optical fiber 3, and the isothermal rings 42 located in the same temperature measurement main channel 1 are connected by a heat equalizing wire 43 arranged axially along the temperature measurement main channel 1, the isothermal ring 42 has an external wireless positioning module 44 and a built-in temperature rise timing module 45, and the wireless positioning module 44 and the temperature rise timing module 45 are connected to the channel control module 46.

[0061] Step S2 specifically includes the following steps:

[0062] S21, performing circumferential temperature detection on the distributed temperature measuring optical fiber 3 through the temperature measuring rod 41;

[0063] S22, using the temperature measuring ring 4 to obtain the circumferential average temperature of the distributed temperature measuring optical fiber 3;

[0064] S23, the heat-saturating wire 43 conducts the temperature of the temperature measuring ring body 4 to the adjacent temperature measuring ring body 4;

[0065] S24, the temperature rise timing module 45 detects the temperature transmission change.

[0066] Through step S2, the distributed temperature measurement optical fiber 3 in the temperature measurement main channel 1 is monitored in sections to promptly detect nodes with broken fibers or abnormal temperatures, and the nodes are located through the wireless positioning module 4. Secondly, the temperature rise timing module 45 is used to perform temperature rise timing and temperature measurement of abnormal nodes to avoid no judgment, and a heat-averaging wire 43 is provided for temperature diffusion to avoid fiber breakage caused by local instantaneous high temperature.

[0067] Step S24 specifically includes the following steps:

[0068] S241, the temperature rise timing module 45 performs daily temperature status monitoring;

[0069] S242, when the temperature exceeds the set value and is detected to be conducted toward the adjacent temperature measuring ring body 4, the temperature rise timing module 45 starts timing;

[0070] S243. When the duration of abnormal temperature conduction is longer than the set safety time value, a current position abnormality warning is issued to the channel control module 46 through the wireless positioning module 4.

[0071] The wireless positioning module 4 is mainly used for locating abnormal nodes and providing accurate positions for the master-slave channel merging and switching of the channel control module 46 .

[0072] In step S3, the temperature rise noise detection device uses the temperature rise noise data in the temperature measurement main channel 1 to obtain the first temperature point that exceeds the noise alarm threshold set in step S4 and uses this temperature point as the active channel merging point to synthesize the temperature measurement main channel 1 and the temperature measurement slave channel 2 data as new channel temperature data.

[0073] The temperature rise noise data acquisition of the temperature rise noise detection device includes the following steps:

[0074] S31, setting the latest temperature curve L1, and setting the previous temperature curve to L2;

[0075] S32, set the historical average temperature data bit n;

[0076] S32, setting the interval number to m;

[0077] Among them, 1<=m<=3 and 7<=n<=12;

[0078] The temperature rise noise data curve is: Lt=L1-(Lm+2+Lm+3+...+Lm+1+n) / n.

[0079] In step S5, when a fiber break occurs, the previous temperature point exceeding the set noise threshold of the temperature measurement main channel 1 and the temperature measurement slave channel 2 is calculated respectively, and the following operations are performed after the calculation is completed:

[0080] ① If the temperature of the temperature point where the fiber is broken is greater than the preset temperature noise alarm value, the splicing will be normal;

[0081] ② If the temperature of the temperature point where the fiber is broken is lower than the preset temperature noise alarm value, the data after this temperature point will be discarded.

[0082] And, the temperature measurement is performed in the same way from channel 2.

[0083] The part that exceeds the temperature rise noise alarm value is synthesized from the data of the temperature measurement slave channel, which effectively reduces the noise at the tail of the optical fiber, allowing the device to measure temperature normally, thereby extending the service life of the equipment.

[0084] In step S6 , the temperature compensation component 5 includes a photoelectric detection module 51 , and the photoelectric detection module 51 is connected to an optical signal modulation host 52 for compensating the intensity of the optical signal.

[0085] Step S6 specifically includes the following steps:

[0086] S61, using the photoelectric detection module 51 to detect the attenuation point data of the distributed temperature measurement optical fiber 3;

[0087] S62, obtaining the anti-Stokes signal and the Stokes signal of the distributed temperature measurement optical fiber 3 at the point, and drawing a light intensity ratio curve of the anti-Stokes light and the Stokes light;

[0088] S63, the light intensity ratio curve is segmented according to the attenuation point data;

[0089] S64, performing piecewise polynomial fitting according to the segmented information, and defining the fitted data as the baseline data of the system at the current temperature;

[0090] S65. The optical signal modulation host 52 performs temperature compensation on the temperature attenuation point of the distributed temperature measurement optical fiber 3 according to the baseline data at the current temperature.

[0091] The light intensity ratio curve is segmented according to the attenuation point data, and the segmented polynomial fitting is performed through the segmented information to obtain the baseline data at various temperatures of the operating environment. Then the ratio line obtained in the actual temperature measurement process is divided by the baseline data to obtain a horizontal curve related to temperature. The ratio of the intensity of anti-Stokes light to that of Stokes light is used to demodulate the temperature distribution of the area to be measured. For the standard two-way Raman signal ratio, in the range of 0-100℃, the Raman ratio is approximately a linear equation, which can be expressed as: T{℃}=m*(I as / I s )+a;

[0092] Among them, m is the proportional coefficient, a is a constant, I as ,I s are the intensities of the anti-Stokes and Stokes signals respectively. Once the values ​​of the proportional coefficient m and the intercept a are determined, the corresponding temperature value can be obtained according to the light intensity ratio of the anti-Stokes and Stokes signals.

[0093] To sum up, the principle of this embodiment is: by detecting the temperature transmission changes of the distributed temperature measurement optical fiber in each annular temperature measurement interval in the temperature measurement main channel 1, when the temperature rise noise detection is abnormal, the temperature measurement data of the temperature measurement slave channel 2 is merged into the temperature measurement main channel 1, and the abnormal node data in the temperature measurement main channel 1 is discarded, thereby forming a new temperature measurement channel, and using the temperature compensation component 5 to compensate for the merged temperature data to prevent the influence of temperature attenuation on the temperature detection data, effectively reduce the noise at the tail of the optical fiber, and enable the equipment to measure temperature normally, thereby extending the service life of the equipment.

[0094] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0095] Although this article uses more terms such as temperature measurement main channel 1, annular temperature measurement interval 11, temperature measurement slave channel 2, distributed temperature measurement optical fiber 3, constant temperature device 31, first temperature measurement module 32, temperature control module 34, temperature display 35, temperature measurement ring body 4, temperature measurement rod 41, isothermal ring 42, heat equalizing wire 43, wireless positioning module 44, temperature rise timing module 45, channel control module 46, temperature compensation component 5, photoelectric detection module 51, optical signal mediation host 52, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A solution to the problem of excessive loss of distributed temperature measurement optical fiber during double-end measurement, characterized in that: The method comprises the following steps: S1, marking the temperatures of the head end and the tail end of the distributed temperature measurement optical fiber (3) in the initial state; S2, setting an annular temperature measurement interval (11) in the temperature measurement main channel (1) to detect the temperature transmission change of the distributed temperature measurement optical fiber (3) in each annular temperature measurement interval (11); S3, a temperature rise noise detection device is provided in each annular temperature measurement interval (11) in the temperature measurement main channel (1) and the temperature measurement slave channel (2) to detect the temperature rise noise at the beginning and end of the annular temperature measurement interval (11); S4. Set the temperature rise noise alarm value; S5, synthesizing the data of the temperature measurement main channel (1) and the temperature measurement slave channel (2) as a new channel temperature and comparing it with the temperature noise alarm value; S6, arranging a temperature compensation component (5) in the annular temperature measurement interval (11) to perform temperature attenuation compensation on the distributed temperature measurement optical fiber (3) in the alarm area; In step S2, the annular temperature measurement interval (11) is arranged corresponding to the distributed temperature measurement optical fiber (3) node in the temperature measurement main channel (1), and a plurality of equidistantly arranged temperature measurement ring bodies (4) are arranged in the annular temperature measurement interval (11), the temperature measurement ring body (4) is connected to the distributed temperature measurement optical fiber (3) in the circumference through a plurality of temperature measurement rods (41), and an isothermal ring (42) is arranged in the temperature measurement ring body (4) to obtain the average temperature value of the temperature detected in the circumference of the distributed temperature measurement optical fiber (3), and the isothermal rings (42) located in the same temperature measurement main channel (1) are connected by a heat-averaging wire (43) arranged along the axial direction of the temperature measurement main channel (1), the isothermal ring (42) is externally provided with a wireless positioning module (44) and internally provided with a temperature rise timing module (45), and the wireless positioning module (44) and the temperature rise timing module (45) are connected to a channel control module (46); Step S2 specifically includes the following steps: S21, performing circumferential temperature detection on the distributed temperature measurement optical fiber (3) by means of a temperature measurement rod (41); S22, using the temperature measuring ring (4) to obtain the circumferential average temperature of the distributed temperature measuring optical fiber (3); S23, the heat-saturating wire (43) conducts the temperature of the temperature measuring ring body (4) to the adjacent temperature measuring ring body (4); S24, the temperature rise timing module (45) detects the temperature transmission change; Step S24 specifically includes the following steps: S241, the temperature rise timing module (45) performs daily temperature status monitoring; S242, when the temperature exceeds the set value and is detected to be conducted toward the adjacent temperature measuring ring body (4), the temperature rise timing module (45) starts timing; S243, when the duration of abnormal temperature conduction is longer than the set safety time value, a current position abnormality warning is issued to the channel control module (46) through the positioning module; In step S3, the temperature rise noise detection device uses the temperature rise noise data in the temperature measurement main channel (1) to obtain the first temperature point exceeding the noise alarm threshold set in step S4 and uses this temperature point as the active channel merging point to synthesize the temperature measurement main channel (1) and the temperature measurement slave channel (2) data as new channel temperature data; In step S3, the temperature rise noise data acquisition of the temperature rise noise detection device includes the following steps: S31, setting the latest temperature curve L1, and setting the previous temperature curve to L2; S32, set the historical average temperature data bit n; S32, setting the interval number to m; Among them, 1<=m<=3 and 7<=n<=12; the temperature rise noise data curve is: Lt=L1-(Lm+2+Lm+3+...+Lm+1+n) / n.

2. The solution to the problem of excessive loss of the distributed temperature measurement optical fiber in double-end measurement according to claim 1 is characterized in that: In step S1, a constant temperature device (31) is arranged at both ends of the distributed temperature measurement optical fiber (3), and a first temperature measurement module (32) and a second temperature measurement module (33) are arranged at both ends of the distributed temperature measurement optical fiber (3), respectively, the constant temperature device (31) is connected to a temperature control module (34) for adjusting the temperature, and the first temperature measurement module (32) and the second temperature measurement module (33) are respectively connected to a temperature display (35).

3. The solution to the problem of excessive loss of the distributed temperature measurement optical fiber in double-end measurement according to claim 1 is characterized in that: In step S5, when a fiber break occurs, the previous temperature point exceeding the set noise threshold of the temperature measurement main channel (1) and the temperature measurement slave channel (2) is calculated respectively, and the following operations are performed after the calculation is completed: ① If the temperature of the temperature point where the fiber is broken is greater than the preset temperature noise alarm value, the splicing is normal; ② If the temperature of the temperature point where the fiber is broken is lower than the preset temperature noise alarm value, the data after this temperature point will be discarded; And, the temperature measurement is performed in the same way from channel (2).

4. The solution to the problem of excessive loss of the distributed temperature measurement optical fiber in double-end measurement according to claim 3 is characterized in that: In step S6, the temperature compensation component (5) comprises a photoelectric detection module (51), and the photoelectric detection module (51) is connected to an optical signal modulation host (52) for compensating the intensity of the optical signal.

5. The solution to the problem of excessive loss of the distributed temperature measurement optical fiber in double-end measurement according to claim 4 is characterized in that: Step S6 specifically includes the following steps: S61, using a photoelectric detection module (51) to detect attenuation point data of the distributed temperature measurement optical fiber (3); S62, obtaining the anti-Stokes signal and the Stokes signal of the attenuation point of the distributed temperature measurement optical fiber (3), and drawing a light intensity ratio curve of the anti-Stokes light and the Stokes light; S63, the light intensity ratio curve is segmented according to the attenuation point data; S64, performing piecewise polynomial fitting according to the segmented information, and defining the fitted data as the baseline data of the system at the current temperature; S65. The optical signal modulation host (52) performs temperature compensation on the temperature attenuation point of the distributed temperature measurement optical fiber (3) according to the baseline data at the current temperature.

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