A method and system for decoupling optical fiber temperature strain measurements

Abstract

The present application relates to the field of optical fiber sensing, and discloses a kind of optical fiber temperature strain measurement decoupling method and system, the present application designs different strain-wavelength coefficient corresponding optical fiber and structure integrated mode and different temperature-wavelength coefficient corresponding optical fiber direction and composite fiber direction angle integrated mode, and the combination of both obtains multiple combination integrated mode;Temperature-wavelength and strain-wavelength coefficient calibration experiment is carried out according to the combination integrated mode to make test piece;Temperature and strain simultaneous measurement experiment is carried out to test piece, and relevant parameters are recorded;Then temperature-wavelength and strain-wavelength coefficient of test piece are combined to form matrix, whether it is non-singular matrix is judged, if yes, then decoupling result is solved;Finally, multiple decoupling results are compared with experimental measurement value, and the optimal parameter combination is obtained.The present application can solve the strain and temperature cross-sensitivity problem of optical fiber sensor, separate the temperature and strain information obtained by optical fiber, and does not increase the size, manufacturing cost and complexity of optical fiber.

Description

Technical Field

[0001] This invention relates to the field of fiber optic sensing technology, and more specifically to a decoupling method and system for fiber optic temperature strain measurement. Background Technology

[0002] Because fiber optic sensors are sensitive to both temperature and strain, and these two factors often coexist in actual measurements, the signals obtained by the sensor are usually a superposition of the two, making them difficult to distinguish. Currently, existing technologies to address the cross-sensitivity of fiber optic sensors to strain and temperature typically fall into two categories: First, encapsulating the fiber optic cable with capillaries or similar external encapsulation methods. This method increases the sensor's size, cost, and impact on structural performance, and its feasibility is limited in certain scenarios. Second, using specific optical fibers or fibers manufactured with special processes. The basic idea behind this approach is a dual-parameter method based on simultaneous temperature and strain measurement, obtaining different temperature and strain response coefficients to separate the temperature and strain signals. The second method typically uses specific optical fibers or fibers manufactured with special processes. These specialized fibers are usually complex to manufacture, costly, or have complex principles, limiting their practical engineering applications.

[0003] For example, the invention patent with publication number CN110207734A discloses a measurement method for eliminating temperature strain cross-sensitivity in fiber optic sensing. This method uses a common optical fiber and a special optical fiber to achieve temperature strain decoupling. The special optical fiber has a complex manufacturing process and is not easy 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 fibers, but does not explain in detail how the different temperature coefficients and strain coefficients of the sensing fibers are obtained. Summary of the Invention

[0005] To address the problems and shortcomings of existing technologies, this invention proposes a decoupling method and system for fiber optic temperature strain measurement. This invention solves the problem of cross-sensitivity between strain and temperature in fiber optic sensors, separating the temperature and strain information acquired by the fiber optic cable to obtain accurate strain and temperature change values ​​of the measured object, without increasing the size, manufacturing cost, or complexity of the fiber optic cable.

[0006] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows:

[0007] This invention discloses a decoupling method for fiber optic temperature strain measurement, the method specifically including the following steps:

[0008] Step A. Design the fiber-structure integration method corresponding to different strain-wavelength coefficients; design the fiber orientation and composite material fiber orientation angle integration method corresponding to different temperature-wavelength strain coefficients;

[0009] Step B. Combine the fiber-structure integration methods corresponding to different strain-wavelength coefficients with the fiber-composite fiber direction angle integration methods corresponding to different temperature-wavelength strain coefficients to obtain multiple different combination integration methods;

[0010] Step C. Fabricate different types of fiber-composite material integrated specimens according to different combination integration methods, and conduct temperature-wavelength coefficient calibration experiments and strain-wavelength coefficient calibration experiments on fiber-composite material integrated specimens with different combination integration methods to obtain the temperature-wavelength coefficient and strain-wavelength coefficient corresponding to the integrated specimens under different combination integration methods.

[0011] Step D. Conduct simultaneous temperature and strain measurement experiments on fiber-composite integrated specimens with different integration methods, and record the strain change, temperature change and fiber wavelength offset of the integrated specimens during the experiment.

[0012] Step E. Combine the temperature-wavelength coefficient and strain-wavelength coefficient of the specimens integrated by different combination integration methods to form a temperature-strain dual-parameter matrix, and determine whether the dual-parameter matrix is ​​a non-singular matrix; when the dual-parameter matrix is ​​a non-singular matrix, calculate the inverse matrix of the matrix and combine it with the fiber wavelength offset corresponding to the combination integration method to obtain the decoupling result of strain change value and temperature change value.

[0013] Step F. Compare the decoupling results of different integration methods with the strain and temperature change values ​​obtained from experimental measurements to obtain the optimal parameter combination.

[0014] Preferably, the integration methods of the optical fiber and the structure include: surface-mount integration, embedded integration, and braided integration.

[0015] Preferably, in the integration method where the optical fiber direction and the composite material fiber direction have different angles, the angle between the optical fiber direction and the composite material fiber direction is between 0 and 90°.

[0016] Preferably, the expression for the temperature strain dual-parameter matrix is ​​as follows:

[0017] ;

[0018] in, and They represent the first i The strain-wavelength coefficient corresponding to the first combination integration method and the second jThe strain-wavelength coefficients corresponding to the various combined integration methods; and They represent the first i The temperature-wavelength coefficient corresponding to the first combination integration method and the second j Temperature-wavelength coefficients corresponding to various combination integration methods.

[0019] 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 fiber wavelength offset corresponding to the combined integration method are combined to obtain the decoupling result of the strain change value and temperature change value. The calculation method is as follows:

[0020] ;

[0021] in, and These represent the decoupling results for strain change and temperature change, respectively. and They represent the first i The strain-wavelength coefficient corresponding to the first combination integration method and the second j The strain-wavelength coefficients corresponding to the various combined integration methods; and They represent the first i The temperature-wavelength coefficient corresponding to the first combination integration method and the second j Temperature-wavelength coefficients corresponding to various combination integration methods; and They represent i The combination and integration method and the first i The fiber wavelength offset corresponding to the various combination and integration methods.

[0022] Preferably, the temperature-wavelength coefficient calibration experiment is carried out under conditions where the integrated specimen is not subjected to external force.

[0023] Preferably, the strain-wavelength coefficient calibration experiment is carried out under isothermal conditions.

[0024] Based on the same inventive concept, another aspect of the present invention discloses a fiber optic temperature strain measurement decoupling system, wherein the decoupling system is used in the above-mentioned fiber optic temperature strain measurement decoupling method, comprising:

[0025] The temperature-strain dual-parameter matrix construction module combines the temperature-wavelength coefficient and strain-wavelength coefficient of specimens with different integration methods to form a temperature-strain dual-parameter matrix.

[0026] The temperature and strain change decoupling module determines whether the constructed temperature and strain dual-parameter matrix is ​​a non-singular matrix; when the dual-parameter matrix is ​​a non-singular matrix, it calculates the inverse matrix of the matrix and combines it with the fiber wavelength offset corresponding to the combination integration method to obtain the decoupling result of the strain change value and the temperature change value.

[0027] The optimal parameter combination selection module compares the decoupling results of different combination integration methods with the strain and temperature change values ​​obtained from experimental measurements to obtain the optimal parameter combination.

[0028] In another aspect, the present invention also discloses a storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described fiber optic temperature strain measurement decoupling method.

[0029] In another aspect, 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, wherein when the processor executes the computer program, it implements the above-described fiber optic temperature strain measurement decoupling method.

[0030] The beneficial effects of this invention are:

[0031] 1. This invention uses different combination and integration methods of ordinary optical fiber and composite materials to achieve precise decoupling of optical fiber temperature change and strain change. It does not rely on special optical fiber or additional packaging process, avoids the high packaging manufacturing cost and complex process of traditional methods, and significantly reduces the implementation threshold of the decoupling solution.

[0032] 2. This invention designs fiber-composite material integrated specimens with different combination integration methods, then obtains the corresponding temperature-wavelength coefficient and strain-wavelength coefficient, and constructs a non-singular matrix of temperature and strain dual parameters. After matrix calculation and selection, the optimal decoupling result of fiber temperature change and strain change is obtained, which can achieve accurate signal separation and ensure high accuracy of decoupling result. Attached Figure Description

[0033] The foregoing and hereinafter detailed description of the invention becomes clearer when read in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of a bare optical fiber;

[0035] Figure 2 This is a schematic diagram of the A-type integration of the present invention;

[0036] Figure 3 This is a schematic diagram of the B-type integration of the present invention;

[0037] Figure 4 This is a schematic diagram of the C-type integration of the present invention;

[0038] Figure 5 This is a schematic diagram of the 0° integration of the present invention;

[0039] Figure 6 This is a schematic diagram of the 45° integration of the present invention;

[0040] Figure 7 This is a schematic diagram of the 90° integration of the present invention;

[0041] Figure 8 This is a schematic diagram of the combined integration method of the present invention. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solutions of this invention, specific embodiments will be used to further illustrate the technical solutions for achieving the objectives of this invention. It should be noted that the technical solutions claimed by this invention include, but are not limited to, the following embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort should fall within the scope of protection of this invention.

[0043] Since fiber optic sensors can sense both temperature and strain simultaneously, when there are large temperature differences in the environment and the influence of temperature cannot be ignored, the temperature and strain signals obtained by the sensor are usually superimposed and difficult to distinguish. It is necessary to decouple the temperature and strain measurement results of the fiber optic sensor in order to obtain the accurate strain value and temperature change value of the measured object separately, while minimizing the increase in the size, manufacturing cost and complexity of the fiber optic cable.

[0044] Based on this, embodiments of the present invention disclose a decoupling method and system for optical fiber temperature strain measurement, which can achieve precise decoupling of optical fiber temperature and strain changes without relying on special optical fibers or additional packaging processes. Therefore, it avoids the high packaging and manufacturing costs and complex processes of traditional methods, significantly lowering the implementation threshold of the decoupling solution.

[0045] This invention first explains and describes the decoupling method for fiber optic temperature strain measurement. The core of this decoupling method is the temperature-strain dual-parameter matrix method based on temperature change and strain change values. According to the principle of fiber optic sensing, when the fiber senses temperature and strain changes, the fiber wavelength will change. The fiber's response coefficient to strain is defined as the strain-wavelength coefficient. The temperature response coefficient of optical fiber is defined as the temperature-wavelength coefficient. When an optical fiber simultaneously experiences changes in strain and temperature, the strain change value is... Temperature change value Then there is the change value of the fiber wavelength. When two optical fibers with different strain and temperature response coefficients simultaneously sense the same strain and temperature changes, such as the strain-wavelength coefficient of the first type of fiber being... Temperature-wavelength coefficient Its wavelength change value is Another type of optical fiber has a strain-wavelength coefficient of... Temperature-wavelength coefficient Its wavelength change value is Then the following equation exists: ,Will Defined as the temperature strain dual-parameter matrix of the optical fiber.

[0046] Furthermore, according to the matrix equation, When the matrix is ​​non-singular, it is invertible, and its inverse matrix can be obtained. Then there is At this point, the system of linear equations has a unique solution: that is, in and Given the given conditions, the solution can be found. It has a unique solution, thus achieving decoupling of temperature change value and strain change value.

[0047] Therefore, the core of this invention lies in obtaining a temperature strain dual-parameter matrix that is a non-singular matrix, i.e., one whose matrix determinant is not equal to zero. Therefore, the present invention aims to obtain the strain-wavelength coefficient of optical fibers with different combination and integration methods. and different temperature-wavelength coefficients And combine them; obtain the corresponding temperature strain dual-parameter matrix under various combinations. Then, determine whether the two-parameter matrix formed by each combination is a non-singular matrix, and solve for the corresponding matrix for each combination. Finally, the different combinations of solutions will be... With reality By conducting comparative analysis, the optimal parameter combination was selected, and the best coefficient for temperature-strain decoupling was finally obtained. .

[0048] To address this, this invention designs fiber-composite material integrated specimens with different integration methods, then obtains the corresponding temperature-wavelength coefficient and strain-wavelength coefficient based on calibration experiments, and constructs a non-singular matrix of temperature and strain dual parameters. After matrix calculation and selection, the optimal decoupling result between fiber temperature change and strain change is obtained. The specific process is as follows:

[0049] (1) Design to obtain different strain-wavelength coefficients The corresponding integration method. Based on the principle of fiber optic strain sensing, the change in fiber wavelength caused by axial strain can be expressed as: ;in, Defined as the effective elastic-optical coefficient of the optical fiber. Therefore, the strain-wavelength coefficient of the optical fiber sensor can be determined. It is only related to the optical elasticity of the fiber material. For bare optical fibers, such as... Figure 1 As shown, the strain-wavelength coefficient of optical fibers of the same material Similarly, changing parameters such as fiber diameter and coating will not affect the strain-wavelength coefficient. However, due to the different integration methods of optical fibers and structures, and their different strain transfer effects, the strain-wavelength coefficient of the optical fiber sensor ultimately varies. The results will also differ. Therefore, the strain-wavelength coefficient can be achieved by designing different fiber-optic and structural integration methods. Different. This invention presents three different methods for integrating optical fibers with structures:

[0050] The first method involves first laying optical fibers on the surface of the composite material test piece, then applying an adhesive film to the surface of the optical fibers and curing it; this is called Type A integration. Figure 2 As shown;

[0051] The second method involves first applying an adhesive film to the surface of the composite material test piece, then laying optical fibers on the adhesive film and curing it; this is called Type B integration. Figure 3 As shown;

[0052] The third method involves weaving optical fibers into dry fibers during the composite material prefabrication stage for co-curing, resulting in C-type integration, such as... Figure 4 As shown.

[0053] (2) Design to obtain different temperature-strain coefficients The corresponding integration method. According to the principle of fiber optic temperature sensing, the change in fiber wavelength caused by temperature change can be expressed as: ;in, Defined as the coefficient of thermal expansion of optical fiber. Defined as the thermo-optic coefficient of the optical fiber. Therefore, the temperature-wavelength coefficient of the optical fiber sensor... The optical fiber's density-wavelength coefficient is mainly determined by the thermal expansion coefficient and thermo-optic coefficient of the optical fiber material. The same applies. For bare optical fibers, the coefficient of thermal expansion of the coating layer has a significant impact, while after the fiber is integrated with the structure, the coefficient of thermal expansion of the structural material has an even greater impact. Due to the anisotropy of composite materials, and considering the linear expansion coefficient of the composite material, when the fiber is integrated with the composite material and the angle between the fiber laying direction and the composite material fiber direction is different, the final temperature-wavelength coefficient of the optical fiber will be affected. The results will also differ. Therefore, the temperature-wavelength coefficient can be achieved by designing an integration method with different angles between the fiber direction and the composite material fiber direction. Different. This invention now designs the following three angle forms between the optical fiber direction and the composite material fiber direction:

[0054] The first type has an angle of 0° between the fiber direction and the composite material fiber direction, which is called 0° integration, such as... Figure 5 As shown;

[0055] The second type has an angle of 45° between the fiber direction and the composite material fiber direction, which is called 45° integration, such as... Figure 6 As shown;

[0056] The third type has an angle of 90° between the fiber direction and the composite material fiber direction, called 90° integration, such as... Figure 7 As shown.

[0057] (3) Design different strain-wavelength coefficients and temperature-wavelength coefficient The combined integration method. Incorporating the strain-wavelength coefficient. Different fiber and structure integration methods and temperature-wavelength coefficients Different fiber orientations and composite material fiber orientation angles are combined and integrated in pairs. Specifically, the following methods are used: Figures 2-4 The A-type integration, B-type integration, and C-type integration in the text are respectively related to... Figures 5-7 By arranging and combining 0° integration, 45° integration, and 90° integration, a total of 9 different combination integration methods are formed, such as... Figure 8 As shown, fiber-composite material integrated test pieces with different combination and integration methods were finally fabricated.

[0058] (4) Strain-wavelength coefficient Calibration experiments. Under isothermal conditions, strain-wavelength coefficient tests were performed on fiber-composite material integrated specimens with nine different integration methods. Calibration experiment. During the experiment, axial strain was induced in the fiber-composite integrated specimen through tension or compression, and wavelength changes were recorded using a spectrometer. The fiber wavelength shift during the experiment was recorded. and strain change value Based on the principle of fiber optic sensing ,at this time Then the fiber-strain coefficients corresponding to different test specimens can be solved. .

[0059] (5) Temperature-wavelength coefficient Calibration experiments. Under conditions free from external forces, nine fiber-composite material integrated specimens with different integration methods were subjected to temperature-wavelength coefficient calibration. Calibration experiment. During the experiment, the fiber-composite integrated test piece was subjected to temperature changes using liquid nitrogen or a water bath, and the wavelength changes during this process were recorded using a spectrometer. The fiber wavelength shift during the experiment was recorded. and temperature change value Based on the principle of fiber optic sensing ,at this time Then the corresponding temperature-strain coefficient can be solved. .

[0060] (6) Conduct simultaneous temperature and strain measurement experiments on optical fiber-composite material integrated specimens with nine different integration methods, and record the strain change values ​​during the experiment. Temperature change value and the fiber wavelength offset of each test piece .

[0061] (7) Arbitrarily select the temperature-wavelength coefficient and strain-wavelength coefficient of the fiber-composite material integrated test piece based on two different combination integration methods to form a temperature-strain dual-parameter matrix. Determine whether it is a non-singular matrix; when When it is a singular matrix, it needs to be reselected and recalculated; when When the matrix is ​​non-singular, its inverse matrix is ​​calculated. , inverse matrix The matrix formed by combining the fiber wavelength offset recorded in step (6) of the experiment. Substituting these equations into the following equations achieves temperature-strain decoupling:

[0062] .

[0063] (8) To obtain the optimal decoupling method, the experimental results of the test pieces with different integration methods were combined in pairs (a total of 36 kinds) and the same solution process as in step (7) was performed to solve them one by one. The results obtained after solving were... With experimental measurements Comparative analysis is conducted to select the optimal parameter combination. .

[0064] Based on the same inventive concept, this invention also discloses a fiber optic temperature strain measurement decoupling system. Since the principle of this system in solving the problem is similar to that of the fiber optic temperature strain measurement decoupling method, the implementation of this system can be referred to the implementation of the method, and repeated details will not be elaborated further. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated. 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,

[0065] The temperature-strain dual-parameter matrix construction module combines the temperature-wavelength coefficient and strain-wavelength coefficient of specimens with different integration methods to form a temperature-strain dual-parameter matrix.

[0066] The temperature and strain change decoupling module determines whether the constructed temperature and strain dual-parameter matrix is ​​a non-singular matrix; when the dual-parameter matrix is ​​a non-singular matrix, it calculates the inverse matrix of the matrix and combines it with the fiber wavelength offset corresponding to the combination integration method to obtain the decoupling result of the strain change value and the temperature change value.

[0067] The optimal parameter combination selection module compares the decoupling results of different combination integration methods with the strain and temperature change values ​​obtained from experimental measurements to obtain the optimal parameter combination.

[0068] It should be noted that the systems, devices, models, or units described in the above embodiments can be implemented by computer chips or physical entities, or by products with certain functions. For ease of description, the above systems are described in this specification by dividing them into various functional units. Of course, in implementing this invention, the functions of each unit can be implemented in one or more software and / or hardware.

[0069] Furthermore, in this specification, adjectives such as first and second may only be used to distinguish an element or action, without necessarily implying any actual such relationship or order.

[0070] Furthermore, this embodiment also provides a computer device, which includes a processor, an input device, an output device, and a memory, all interconnected. The memory stores a computer program, which includes program instructions, and the processor is configured to invoke the program instructions to execute the steps described in the above embodiment.

[0071] Furthermore, another aspect of this embodiment provides a computer-readable storage medium, characterized in that: the computer-readable storage medium stores a computer program, the computer program including program instructions, which, when executed by a processor, cause the processor to perform the steps in the above embodiments.

[0072] In this embodiment, the processor can be a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0073] 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 program units corresponding to the above-described method embodiments of the present invention. The processor executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory, thereby implementing the methods described in the above-described method embodiments.

[0074] The memory may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor, etc. Furthermore, the memory may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the processor, which can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0075] The one or more units are stored in the memory and, when executed by the processor, perform the methods described in the above embodiments.

[0076] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A decoupling method for fiber optic temperature strain measurement, characterized in that, Includes the following steps: Step A. Design the fiber-structure integration method corresponding to different strain-wavelength coefficients; design the fiber orientation and composite material fiber orientation angle integration method corresponding to different temperature-wavelength strain coefficients; Step B. Combine the fiber-structure integration methods corresponding to different strain-wavelength coefficients with the fiber-composite fiber direction angle integration methods corresponding to different temperature-wavelength strain coefficients to obtain multiple different combination integration methods; Step C. Fabricate different types of fiber-composite material integrated specimens according to different combination integration methods, and conduct temperature-wavelength coefficient calibration experiments and strain-wavelength coefficient calibration experiments on fiber-composite material integrated specimens with different combination integration methods to obtain the temperature-wavelength coefficient and strain-wavelength coefficient corresponding to the integrated specimens under different combination integration methods. Step D. Conduct simultaneous temperature and strain measurement experiments on fiber-composite integrated specimens with different integration methods, and record the strain change, temperature change and fiber wavelength offset of the integrated specimens during the experiment. Step E. Combine the temperature-wavelength coefficient and strain-wavelength coefficient of the specimens with different integration methods to form a temperature-strain dual-parameter matrix, and determine 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 fiber wavelength offset corresponding to the combined integration method is combined to obtain the decoupling result of the strain change value and the temperature change value. Step F. Compare the decoupling results of different integration methods with the strain and temperature change values ​​obtained from experimental measurements to obtain the optimal parameter combination; The temperature-wavelength coefficient calibration experiment was conducted under conditions where the integrated specimen was not subjected to external forces. The strain-wavelength coefficient calibration experiment was carried out under isothermal conditions.

2. The fiber optic temperature strain measurement decoupling method according to claim 1, characterized in that, The fiber optic and structural integration methods include: surface-mounted fiber optic integration, embedded fiber optic integration, and braided fiber optic integration.

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

4. The fiber optic temperature strain measurement decoupling method according to claim 1, characterized in that, The expression for the temperature strain two-parameter matrix is ​​as follows: ； in, and They represent the first i The strain-wavelength coefficient corresponding to the first combination integration method and the second j The strain-wavelength coefficients corresponding to the various combined integration methods; and They represent the first i The temperature-wavelength coefficient corresponding to the first combination integration method and the second j Temperature-wavelength coefficients corresponding to various combination integration methods.

5. The fiber optic 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 is ​​calculated and the strain change value, temperature change value, and fiber wavelength offset corresponding to the combined integration method are combined to obtain the decoupling results of the strain change value and temperature change value. The calculation method is as follows: ； in, and These represent the decoupling results for strain change and temperature change, respectively. and They represent the first i The strain-wavelength coefficient corresponding to the first combination integration method and the second j The strain-wavelength coefficients corresponding to the various combined integration methods; and They represent the first i The temperature-wavelength coefficient corresponding to the first combination integration method and the second j Temperature-wavelength coefficients corresponding to various combination integration methods; and They represent i The combination and integration method and the first j The fiber wavelength offset corresponding to the various combination and integration methods.

6. A fiber optic temperature strain measurement decoupling system, said system being used to implement the fiber optic temperature strain measurement decoupling method according to any one of claims 1-5, characterized in that, include: The temperature-strain dual-parameter matrix construction module combines the temperature-wavelength coefficient and strain-wavelength coefficient of specimens with different integration methods to form a temperature-strain dual-parameter matrix. The temperature and strain change decoupling module determines whether the constructed temperature and strain dual-parameter matrix is ​​a non-singular matrix; when the dual-parameter matrix is ​​a non-singular matrix, it calculates the inverse matrix of the matrix and combines it with the fiber wavelength offset corresponding to the combination integration method 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 and temperature change values ​​obtained from experimental measurements to obtain the optimal parameter combination.

7. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the fiber optic temperature strain measurement decoupling method according to any one of claims 1-5.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable in the processor, characterized in that, When the processor executes the computer program, it implements the fiber optic temperature strain measurement decoupling method according to any one of claims 1-5.

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