Optical fiber temperature strain measurement decoupling method and system

Abstract

The invention relates to the field of optical fiber sensing, and discloses an optical fiber temperature strain measurement decoupling method and system. Optical fiber and structure integration modes corresponding to different strain-wavelength coefficients and optical fiber direction and composite material fiber direction included angle integration modes corresponding to different temperature-wavelength coefficients are designed; the two are combined to obtain a plurality of combination integration modes; a test piece is manufactured according to the combined integration mode, and temperature-wavelength and strain-wavelength coefficient calibration experiments are carried out; carrying out a simultaneous temperature and strain measurement experiment on the test piece, and recording related parameters; combining the temperature-wavelength coefficient and the strain-wavelength coefficient of the test piece to form a matrix, judging whether the matrix is a nonsingular matrix, and if so, solving a decoupling result; and finally, comparing a plurality of decoupling results with experimental measurement values to obtain an optimal parameter combination. The problem of strain and temperature cross sensitivity of the optical fiber sensor can be solved, temperature and strain information acquired by the optical fiber are separated, and the size, the manufacturing cost and the complexity of the optical fiber are not increased.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber sensing technology, and more particularly to an optical fiber temperature and strain measurement decoupling method and system. Background Art

[0002] Since fiber optic sensors are sensitive to both temperature and strain, temperature and strain usually exist simultaneously in actual measurements, resulting in the signal obtained by the sensor being the result of the two being superimposed and difficult to distinguish. Currently, there are two common technologies for solving the cross-sensitivity problem of strain and temperature in fiber optic sensors: one is to encapsulate the optical fiber using capillaries, etc. This external packaging method increases the size, cost, and impact on the structural performance of the sensor, and its feasibility is limited in specific scenarios; the other is to use specific optical fibers or optical fibers made by special processes. The basic idea is to use a dual-parameter method based on simultaneous measurement of temperature and strain to obtain different temperature strain response coefficients and achieve separation of temperature strain signals. The second method usually uses specific optical fibers or optical fibers made by special processes. This type of special optical fiber usually has a complex manufacturing process, high manufacturing cost, or complex principles, and is not very applicable in actual engineering.

[0003] For example, the invention patent with publication number CN110207734A discloses a measurement method for eliminating temperature-strain cross-sensitivity in optical fiber sensing. This method uses an ordinary optical fiber and a special optical fiber to achieve temperature-strain decoupling. The manufacturing process of the special optical fiber is complex and difficult to obtain.

[0004] For example, the invention patent with publication number CN109632134A discloses a Brillouin optical time-domain analysis temperature and strain decoupling method and system. The method mentions the use of different sensing optical fibers, but does not explain in detail how the different temperature coefficients and strain coefficients of the sensing optical fibers are obtained. Summary of the Invention

[0005] To address the problems and shortcomings of existing technologies, the present invention proposes a fiber-optic temperature-strain measurement decoupling method and system. This method addresses the cross-sensitivity issue between strain and temperature in fiber-optic sensors. It separates the temperature and strain information acquired by the fiber, allowing accurate strain and temperature change measurements of the measured object to be obtained without increasing the size, manufacturing cost, or complexity of the fiber.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows: In one aspect, the present invention discloses a method for decoupling optical fiber temperature and strain measurement, the method specifically comprising the following steps: Step A. Designing the integration method of optical fiber and structure corresponding to different strain-wavelength coefficients; Designing the integration method of the angle between the optical fiber direction and the composite fiber direction corresponding to different temperature-wavelength strain coefficients; Step B. combining the optical fiber and structure integration methods corresponding to different strain-wavelength coefficients with the optical fiber direction and composite fiber direction angle integration methods corresponding to different temperature-wavelength strain coefficients to obtain multiple different combined integration methods; Step C. Fabricating different types of optical fiber-composite integrated test pieces according to different combined integration methods, and conducting temperature-wavelength coefficient calibration experiments and strain-wavelength coefficient calibration experiments on the optical fiber-composite integrated test pieces with different combined integration methods, respectively, to obtain the temperature-wavelength coefficient and strain-wavelength coefficient corresponding to the integrated test pieces under different combined integration methods; Step D. Conducting simultaneous temperature and strain measurement experiments on optical fiber-composite integrated specimens with different integration combinations, and recording the strain change value, temperature change value, and optical fiber wavelength offset of the integrated specimens during the experiment; Step E. Combining the temperature-wavelength coefficients and strain-wavelength coefficients of the integrated test pieces in different combination integration modes in pairs to form a temperature-strain dual-parameter matrix, and determining whether the dual-parameter matrix is a non-singular matrix; when the dual-parameter matrix is a non-singular matrix, calculating the inverse matrix of the matrix and simultaneously calculating the optical fiber wavelength offset corresponding to the combination integration mode to obtain a decoupling result of the strain change value and the temperature change value; Step F: Compare the decoupling results of different combination integration modes with the strain change values and temperature change values obtained from the experimental measurement to obtain the optimal parameter combination.

[0007] Preferably, the integration methods of the optical fiber and the structure include: optical fiber surface mounting integration, optical fiber embedding integration and optical fiber braiding integration.

[0008] Preferably, in the integration mode in which the optical fiber direction and the composite fiber direction have different angles, the angle between the optical fiber direction and the composite fiber direction is between 0° and 90°.

[0009] Preferably, the temperature-strain dual parameter matrix is expressed as follows: ; in, and Respectively represent i The strain-wavelength coefficient corresponding to the first combination integration method and the j The strain-wavelength coefficient corresponding to the combination integration method; and Respectively represent i The temperature-wavelength coefficient corresponding to the first combination integration method and the j The temperature-wavelength coefficients corresponding to the three combined integration methods.

[0010] Preferably, in step E, when the dual-parameter matrix is a singular matrix, the inverse matrix of the matrix is calculated and the strain change value, temperature change value, and optical fiber wavelength offset corresponding to the combined integration method are simultaneously solved to obtain the decoupling result of the strain change value and the temperature change value. The calculation method is as follows: ; in, and Respectively represent the decoupling results of strain change value and temperature change value; and Respectively represent i The strain-wavelength coefficient corresponding to the first combination integration method and the j The strain-wavelength coefficient corresponding to the combination integration method; and Respectively represent i The temperature-wavelength coefficient corresponding to the first combination integration method and the j The temperature-wavelength coefficients corresponding to the combined integration methods; and Respectively i The first combination integration method and the i The optical fiber wavelength offset corresponding to the three combined integration methods.

[0011] Preferably, the temperature-wavelength coefficient calibration experiment is carried out under the condition that the integrated specimen is not subjected to external forces. Preferably, the strain-wavelength coefficient calibration experiment is carried out under constant temperature conditions. Based on the same inventive concept, the present invention further discloses a fiber optic temperature and strain measurement decoupling system. The decoupling system is used in the above-mentioned fiber optic temperature and strain measurement decoupling method, comprising: The temperature-strain dual-parameter matrix construction module combines the temperature-wavelength coefficients and strain-wavelength coefficients of the integrated specimens in different combination integration modes into a temperature-strain dual-parameter matrix; The temperature and strain change decoupling module determines whether the constructed temperature-strain dual-parameter matrix is a non-singular matrix. If the dual-parameter matrix is a non-singular matrix, the inverse matrix of the matrix is calculated and the optical fiber wavelength offset corresponding to the combined integration method is calculated to obtain the decoupling result of the strain change value and the temperature change value. The optimal parameter combination selection module compares the decoupling results of different combination integration methods with the strain change values and temperature change values obtained from experimental measurements to obtain the optimal parameter combination.

[0012] In another aspect, the present invention further discloses a storage medium storing a computer program. When the computer program is executed by a processor, the above-mentioned optical fiber temperature strain measurement decoupling method is implemented.

[0013] On the other hand, the present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable in the processor. When the processor executes the computer program, the above-mentioned optical fiber temperature strain measurement decoupling method is implemented. Beneficial effects of the present invention: 1. The present invention adopts different combination integration methods of ordinary optical fiber and composite material design to achieve precise decoupling of optical fiber temperature changes and strain changes without relying on special optical fiber or additional packaging process, avoiding the high packaging manufacturing costs and complex processes in traditional methods, and significantly lowering the implementation threshold of the decoupling solution.

[0014] 2. The present invention designs optical fiber-composite integrated specimens under different combination integration modes, and then obtains the corresponding temperature-wavelength coefficient and strain-wavelength coefficient, and thereby constructs a non-singular matrix of temperature and strain dual parameters. Then, through matrix calculation and selection, the optimal decoupling result of optical fiber temperature change and strain change is obtained, which can achieve accurate signal separation and ensure high precision of the decoupling result. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The foregoing and following detailed description of the present invention will become more apparent when read in conjunction with the following drawings, in which: Figure 1 Schematic diagram of bare optical fiber; Figure 2 This is a schematic diagram of type A integration of the present invention; Figure 3 This is a schematic diagram of type B integration of the present invention; Figure 4 This is a schematic diagram of the C-type integration of the present invention; Figure 5 This is a 0° integration schematic diagram of the present invention; Figure 6 This is a schematic diagram of 45° integration of the present invention; Figure 7 This is a schematic diagram of 90° integration of the present invention; Figure 8 This is a schematic diagram of the combined integration method of the present invention. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions for achieving the purposes of the present invention will be further illustrated below through specific embodiments. It should be noted that the technical solutions claimed for protection by the present invention include but are not limited to the following embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention. Since fiber optic sensors can sense temperature and strain simultaneously, when the ambient temperature difference is large and the temperature influence cannot be ignored, the temperature and strain signals obtained by the sensor are usually the result of the superposition of the two and are difficult to distinguish. The temperature and strain measurement results of the fiber optic sensor must be decoupled to obtain the accurate strain value and temperature change value of the measured object respectively, and try not to increase the size, production cost and complexity of the optical fiber.

[0017] Based on this, embodiments of the present invention disclose a method and system for decoupling fiber temperature and strain measurements. This method accurately decouples fiber temperature and strain changes without relying on specialized optical fibers or additional packaging processes. This eliminates the high packaging and manufacturing costs and complex processes associated with traditional methods, significantly lowering the barrier to implementation for decoupling solutions.

[0018] The present invention first explains and illustrates the fiber optic temperature and strain measurement decoupling method. The core of the present invention's decoupling method is a temperature-strain dual-parameter matrix method based on temperature change and strain change values. According to the fiber optic sensing principle, when the fiber senses temperature changes and strain, the fiber wavelength will change. The fiber's response coefficient to strain is defined as the strain-wavelength coefficient. , the optical fiber's response coefficient to temperature is defined as the temperature-wavelength coefficient When the optical fiber senses strain and temperature changes at the same time, the strain change value is , the temperature change value is , then the optical fiber wavelength change value is When there are two optical fibers with different strain and temperature response coefficients that simultaneously sense the same strain change and temperature change, for example, the strain-wavelength coefficient of the first optical fiber is , temperature-wavelength coefficient , the wavelength change value is ; The strain-wavelength coefficient of another optical fiber is , temperature-wavelength coefficient , the wavelength change value is . Then the following equation exists: ,Will It is defined as the temperature-strain dual-parameter matrix of the optical fiber.

[0019] Furthermore, according to the matrix equation, When it is a non-singular matrix, the matrix is reversible and its inverse matrix can be obtained , then At this point, the linear equations can obtain a unique solution: and Under known conditions, we can solve And there is a unique solution, thus achieving the decoupling of temperature change and strain change.

[0020] Therefore, the core of the present invention is to obtain a temperature-strain dual-parameter matrix that is a non-singular matrix, that is, a matrix whose determinant is not equal to zero. To this end, the idea of the present invention is to obtain the strain-wavelength coefficient of optical fibers in different integrated combinations. and different temperature-wavelength coefficients , and combine them; obtain the corresponding temperature-strain double parameter matrix under various combinations , and then determine whether the two-parameter matrix formed by each combination is a non-singular matrix, and solve the corresponding ; Finally, the different combinations of solutions will correspond to With actual Conduct comparative analysis to select the optimal parameter combination and ultimately obtain the optimal coefficient for temperature-strain decoupling .

[0021] To this end, the present invention designs fiber-composite integrated test pieces in different integrated combinations. Based on calibration experiments, the corresponding temperature-wavelength coefficients and strain-wavelength coefficients are obtained. From these coefficients, a non-singular matrix of temperature-strain dual parameters is constructed. Matrix calculations and selection are then performed to obtain the optimal decoupling result for fiber temperature and strain changes. The specific process is as follows: (1) Design to obtain different strain-wavelength coefficients Corresponding integration method. According to the principle of optical fiber strain sensing, the change in optical fiber wavelength caused by axial strain can be expressed as: ;in, It is defined as the effective elastic-optical coefficient of the optical fiber. From this, we can know that the strain-wavelength coefficient of the optical fiber sensor is It is only related to the elastic coefficient of the optical fiber material. Figure 1 As shown, the strain-wavelength coefficient of optical fiber of the same material Similarly, changing parameters such as fiber diameter and coating will not affect the strain-wavelength coefficient However, the integration of optical fiber and structure is different, and the strain transmission effect is different. The strain-wavelength coefficient of the optical fiber sensor is Therefore, the strain-wavelength coefficient can be achieved by designing different optical fibers and structural integration methods. Different. The present invention now designs the following three different ways of integrating optical fibers and structures: The first method is to lay the optical fiber on the surface of the composite test piece first, and then apply the film on the surface of the optical fiber for curing, which is called A-type integration. Figure 2 As shown; The second method is to first apply a film on the surface of the composite test piece, and then lay optical fibers on the film surface for curing, which is called B-type integration. Figure 3 As shown; The third method is to weave the optical fiber into the dry fiber during the prefabrication stage of the composite material and then solidify it into C-type integration. Figure 4 shown.

[0022] (2) Design to obtain different temperature-strain coefficients Corresponding integration method. According to the principle of optical fiber temperature sensing, the change in optical fiber wavelength caused by temperature change can be expressed as: ;in, Defined as the thermal expansion coefficient of the optical fiber, It is defined as the thermo-optical coefficient of the optical fiber. From this, we can know that the temperature-wavelength coefficient of the optical fiber sensor Mainly determined by the thermal expansion coefficient and thermo-optical coefficient of the optical fiber material, the optical fiber length-wavelength coefficient of the same material The same. For bare optical fiber, the thermal expansion coefficient of the coating has a greater impact, and after the optical fiber is integrated with the structure, the thermal expansion coefficient of the structural material has an even greater impact. Due to the anisotropy of the composite material, considering the linear expansion coefficient of the composite material, after the optical fiber is integrated with the composite material, if the laying direction of the optical fiber is at a different angle to the direction of the composite fiber, the final temperature-wavelength coefficient of the optical fiber will be Therefore, the temperature-wavelength coefficient can be achieved by designing an integration method with different angles between the optical fiber direction and the composite fiber direction. The present invention now designs the following three angles between the optical fiber direction and the composite fiber direction: The first type has an angle of 0° between the direction of the optical fiber and the direction of the composite fiber, which is called 0° integration. Figure 5 As shown; The second type is that the angle between the optical fiber direction and the composite fiber direction is 45°, which is called 45° integration. Figure 6 As shown; The third type is that the angle between the optical fiber direction and the composite fiber direction is 90°, which is called 90° integration. Figure 7 shown.

[0023] (3) Design different strain-wavelength coefficients and the temperature-wavelength coefficient The strain-wavelength coefficient Different fiber and structure integration methods and temperature-wavelength coefficients Different optical fiber directions and composite fiber direction angle integration methods are used for pairwise integration. Figure 2-Figure 4 Type A integration, type B integration and type C integration are respectively Figure 5-Figure 7 The 0° integration, 45° integration and 90° integration are arranged and combined to form 9 different combination integration methods, such as Figure 8As shown, finally, optical fiber-composite material integrated test pieces with different combination integration methods were made.

[0024] (4) Strain-wavelength coefficient Calibration experiment. Under constant temperature conditions, 9 fiber-composite integrated test pieces with different integration methods were subjected to strain-wavelength coefficient calibration. Calibration experiment. During the experiment, the fiber-composite integrated test piece is subjected to axial strain by stretching or compressing, and the wavelength change during the process is obtained by using a spectrum analyzer. The wavelength offset of the fiber during the experiment is recorded. and strain change , according to the principle of optical fiber sensing ,at this time , then the fiber-strain coefficient corresponding to each different test piece can be solved .

[0025] (5) Temperature-wavelength coefficient Calibration experiment. Under the condition of no external force, the temperature-wavelength coefficient of 9 optical fiber-composite integrated test pieces with different integration methods were respectively Calibration experiment. During the experiment, the temperature of the fiber-composite integrated test piece is changed by liquid nitrogen or water bath, and the wavelength change during the process is obtained by spectrum analyzer. The wavelength offset of the fiber during the experiment is recorded. and temperature change , according to the principle of optical fiber sensing ,at this time , then the corresponding temperature-strain coefficient can be solved .

[0026] (6) Conduct temperature and strain simultaneous measurement experiments on 9 fiber-composite integrated test pieces with different integration methods, and record the strain change values during the experiment. , temperature change value And the optical fiber wavelength offset of each test piece .

[0027] (7) Arbitrarily select the temperature-wavelength coefficient and strain-wavelength coefficient of the optical fiber-composite integrated test piece based on two different combination integration methods to form a temperature-strain dual parameter matrix , to determine whether it is a non-singular matrix; when When it is a singular matrix, it needs to be reselected and calculated; when When it is a non-singular matrix, its inverse matrix is calculated , the inverse matrix The matrix formed by combining the optical fiber wavelength offset recorded in the experimental process of step (6) Substitute into the following equation to achieve temperature-strain decoupling: .

[0028] (8) In order to obtain the optimal decoupling method, the experimental results of the test pieces with different combination integration methods are combined in pairs (a total of 36 types) and the same solution process as step (7) is performed to solve them one by one. Compared with experimental measurements Conduct comparative analysis to select the optimal parameter combination .

[0029] Based on the same inventive concept, an embodiment of the present invention also discloses an optical fiber temperature strain measurement decoupling system. Since the principle of solving the problem by this system is similar to that of the optical fiber temperature strain measurement decoupling method, the implementation of the system can refer to the implementation of the method, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements predetermined functions. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived. The system may include: a temperature-strain dual-parameter matrix construction module, a temperature and strain change decoupling module, and an optimal parameter combination selection module; wherein, The temperature-strain dual-parameter matrix construction module combines the temperature-wavelength coefficients and strain-wavelength coefficients of the integrated specimens in different combination integration modes into a temperature-strain dual-parameter matrix; The temperature and strain change decoupling module determines whether the constructed temperature-strain dual-parameter matrix is a non-singular matrix. If the dual-parameter matrix is a non-singular matrix, the inverse matrix of the matrix is calculated and the optical fiber wavelength offset corresponding to the combined integration method is calculated to obtain the decoupling result of the strain change value and the temperature change value. The optimal parameter combination selection module compares the decoupling results of different combination integration methods with the strain change values and temperature change values obtained from experimental measurements to obtain the optimal parameter combination.

[0030] It should be noted that the systems, devices, models, or units described in the above embodiments can be implemented by computer chips or physical devices, or by products with certain functions. For ease of description, this specification describes the above systems by functionally grouping various units. Of course, when implementing the present invention, the functions of each unit can be implemented in the same or multiple software and / or hardware components.

[0031] Furthermore, in this specification, adjectives such as first and second may be used merely to distinguish one element or action from another, without necessarily or implying any actual such relationship or order.

[0032] Furthermore, another aspect of this embodiment also provides a computer device, which includes a processor, an input device, an output device and a memory, and the processor, input device, output device and memory are interconnected; wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the steps in the above embodiment.

[0033] Furthermore, another aspect of this embodiment also provides a computer-readable storage medium, characterized in that: the computer-readable storage medium stores a computer program, the computer program includes program instructions, and when the program instructions are executed by a processor, the processor executes the steps in the above embodiment.

[0034] In this embodiment, the processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0035] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and units, such as the corresponding program units in the above-described method embodiments of the present invention. The processor executes the non-transitory software programs, instructions, and modules stored in memory to perform various processor functions and work data processing, thereby implementing the methods in the above-described method embodiments.

[0036] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely located relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0037] The one or more units are stored in the memory, and when executed by the processor, perform the method in the above embodiment.

[0038] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A fiber optic temperature and strain measurement decoupling method, characterized in that: The following steps are involved: Step A. Designing the integration method of optical fiber and structure corresponding to different strain-wavelength coefficients; Designing the integration method of the angle between the optical fiber direction and the composite fiber direction corresponding to different temperature-wavelength strain coefficients; Step B. combining the optical fiber and structure integration methods corresponding to different strain-wavelength coefficients with the optical fiber direction and composite fiber direction angle integration methods corresponding to different temperature-wavelength strain coefficients to obtain multiple different combined integration methods; Step C. Fabricating different types of optical fiber-composite integrated test pieces according to different combined integration methods, and conducting temperature-wavelength coefficient calibration experiments and strain-wavelength coefficient calibration experiments on the optical fiber-composite integrated test pieces with different combined integration methods, respectively, to obtain the temperature-wavelength coefficient and strain-wavelength coefficient corresponding to the integrated test pieces under different combined integration methods; Step D. Conducting simultaneous temperature and strain measurement experiments on optical fiber-composite integrated specimens with different integration combinations, and recording the strain change value, temperature change value, and optical fiber wavelength offset of the integrated specimens during the experiment; Step E. Combining the temperature-wavelength coefficients and strain-wavelength coefficients of the integrated test pieces in different combination integration modes in pairs to form a temperature-strain dual-parameter matrix, and determining whether the dual-parameter matrix is a non-singular matrix; When the dual-parameter matrix is a non-singular matrix, the inverse matrix of the matrix is calculated and the optical fiber wavelength offset corresponding to the combined integration method is simultaneously calculated to obtain the decoupling result of the strain change value and the temperature change value; Step F: Compare the decoupling results of different combination integration modes with the strain change values and temperature change values obtained from the experimental measurement to obtain the optimal parameter combination.

2. The optical fiber temperature strain measurement decoupling method according to claim 1, characterized in that: The optical fiber and structure integration methods include: optical fiber surface mounting integration, optical fiber embedding integration and optical fiber braiding integration.

3. The optical fiber temperature strain measurement decoupling method according to claim 1, characterized in that: In the angle integration method between the optical fiber direction and the composite fiber direction, the angle between the optical fiber direction and the composite fiber direction is designed to be between 0° and 90°.

4. The optical fiber temperature strain measurement decoupling method according to claim 1, characterized in that: The expression of the temperature strain double parameter matrix is as follows: ； in, and Respectively represent i The strain-wavelength coefficient corresponding to the first combination integration method and the j The strain-wavelength coefficient corresponding to the combination integration method; and Respectively represent i The temperature-wavelength coefficient corresponding to the first combination integration method and the j The temperature-wavelength coefficients corresponding to the three combined integration methods.

5. The optical fiber temperature strain measurement decoupling method according to claim 1, characterized in that: In step E, when the dual-parameter matrix is a singular matrix, the inverse matrix of the matrix is calculated and the strain change value, temperature change value, and optical fiber wavelength offset corresponding to the combined integration method are simultaneously solved to obtain the decoupling result of the strain change value and the temperature change value. The calculation method is as follows: ； in, and Respectively represent the decoupling results of strain change value and temperature change value; and Respectively represent i The strain-wavelength coefficient corresponding to the first combination integration method and the j The strain-wavelength coefficient corresponding to the combination integration method; and Respectively represent i The temperature-wavelength coefficient corresponding to the first combination integration method and the j The temperature-wavelength coefficients corresponding to the combined integration methods; and Respectively i The first combination integration method and the j The optical fiber wavelength offset corresponding to the three combined integration methods.

6. The optical fiber temperature strain measurement decoupling method according to claim 1, characterized in that: The temperature-wavelength coefficient calibration experiment is carried out under the condition that the integrated specimen is not subjected to external force.

7. The optical fiber temperature strain measurement decoupling method according to claim 1, characterized in that: The strain-wavelength coefficient calibration experiment is carried out under constant temperature conditions.

8. An optical fiber temperature and strain measurement decoupling system, the system being used to implement the optical fiber temperature and strain measurement decoupling method according to any one of claims 1 to 7, characterized in that: include: The temperature-strain dual-parameter matrix construction module combines the temperature-wavelength coefficients and strain-wavelength coefficients of the integrated specimens in different combination integration modes into a temperature-strain dual-parameter matrix; The temperature and strain change decoupling module determines whether the constructed temperature-strain dual-parameter matrix is a non-singular matrix. If the dual-parameter matrix is a non-singular matrix, the inverse matrix of the matrix is calculated and the optical fiber wavelength offset corresponding to the combined integration method is calculated to obtain the decoupling result of the strain change value and the temperature change value. The optimal parameter combination selection module compares the decoupling results of different combination integration methods with the strain change values and temperature change values obtained from experimental measurements to obtain the optimal parameter combination.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the optical fiber temperature and strain measurement decoupling method according to any one of claims 1 to 7 is implemented.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein: When the processor executes the computer program, the optical fiber temperature and strain measurement decoupling method according to any one of claims 1 to 7 is implemented.

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