Static strain measurement method and system based on grating array and electronic equipment

Abstract

The invention relates to a static strain measurement method and system based on a grating array, and electronic equipment, and belongs to the technical field of optical fiber sensors, and the method comprises the steps: obtaining a reflection signal obtained through the reflection of a laser pulse signal by a chirp grating array; the laser pulse signal is transmitted by the grating array sound wave demodulator; interference demodulation is carried out on the reflected signal, and the phase of the reflected signal is determined; and performing optical frequency drift compensation and temperature compensation on the phase to obtain a static strain value of the optical fiber. According to the static strain measurement method based on the grating array, signal demodulation is achieved through the grating array sensing unit and an interference mode, a high-speed, high-spatial-resolution and wide-range static strain distribution measurement method can be achieved through temperature decoupling, and when the static strain measurement method is applied to infrastructures, the measurement accuracy is greatly improved. The structure change of the structural body can be rapidly and accurately detected, so that the safety state of the infrastructure structure is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensors, and in particular to a static strain measurement method, system and electronic equipment based on a grating array. Background Art

[0002] my country's construction scale of large-scale infrastructure such as high-speed railways, urban rail transit, oil and gas pipelines, highways, large bridges, high-voltage / ultra-high-voltage power transmission lines, etc. is developing rapidly, and the operating mileage is increasing rapidly. The operation status monitoring and safety management of these large-scale infrastructure and major engineering structures have become the most urgent and primary issues to be considered and resolved.

[0003] At present, the means of detecting structural damage in aspects such as roadbed settlement, bridge deformation, oil and gas pipeline leakage, and tunnel settlement deformation include manual detection and distributed monitoring using optical fiber.

[0004] On the one hand, manual detection requires a large number of personnel to operate, and on the other hand, the detection equipment is slow and cannot achieve real-time online detection, so it can only be carried out periodically. Distributed monitoring methods using optical fibers are also used in projects, but traditional distributed strain demodulation technology has problems such as large delay, low accuracy and narrow range. Traditional distributed optical fiber sensing technology cannot achieve real-time static strain demodulation. Summary of the invention

[0005] In view of this, it is necessary to provide a static strain measurement method, system and electronic device based on a grating array to solve the problems of large delay, low accuracy and narrow range of traditional distributed strain demodulation technology.

[0006] In order to solve the above problems, the present invention provides a static strain measurement method based on a grating array, comprising: Acquiring a reflection signal obtained by reflecting a laser pulse signal by a chirped grating array; the laser pulse signal is emitted by a grating array acoustic wave demodulator; Performing interference demodulation on the reflected signal through an interferometer to determine the phase of the reflected signal; Optical frequency drift compensation and temperature compensation are performed on the phase to obtain a static strain value of the optical fiber.

[0007] In a possible implementation, performing optical frequency drift compensation and temperature compensation on the phase to obtain a static strain value of the optical fiber includes: Performing optical frequency drift compensation and temperature compensation on the phase to determine a compensated phase; Determining a length change of the optical fiber based on the compensated phase; The static strain value is determined based on the length change of the optical fiber.

[0008] In a possible implementation, the expression for the change in length of the optical fiber is as follows:

[0009] in, Indicates the change in length of the optical fiber, represents the phase after compensation, represents the wavelength of the light source, Represents the refractive index of optical fiber.

[0010] The present invention also provides a static strain measurement system based on a grating array, comprising: Grating array acoustic wave demodulator, optical interface and chirped grating array; The grating array acoustic wave demodulator is connected to the chirped grating array via the optical interface; The grating array acoustic wave demodulator is used to emit laser pulse signals; The chirped grating array is used to reflect the laser pulse signal to obtain a reflected signal; The optical interface is used to send the laser pulse signal to the chirped grating array, and to send the reflected signal to the grating array acoustic wave demodulator.

[0011] In a possible implementation, the grating array acoustic wave demodulator is further used for: The reflected signal is interferometrically demodulated by an interferometer to determine the phase of the reflected signal.

[0012] In a possible implementation, the interferometer is a Mach-Zehnder interferometer based on a 3×3 coupler.

[0013] In a possible implementation, the chirped grating array is a chirped grating array compounded into OPGW / OPPC.

[0014] In a possible implementation manner, the optical interface is further used for: Separate the communication fiber optic signal and the sensor grating signal.

[0015] On the other hand, the present invention also provides an electronic device, including a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the static strain measurement method based on the grating array described in any of the above implementations.

[0016] On the other hand, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the static strain measurement method based on a grating array described in any of the above implementations is implemented.

[0017] The beneficial effects of the present invention are as follows: the static strain measurement method, system and electronic device based on the grating array provided by the present invention emit a laser pulse signal through a grating array acoustic demodulator, and reflect the laser pulse signal through a chirped grating array to obtain a reflected signal, and perform interference demodulation on the reflected signal to obtain the phase of the reflected signal, and perform optical frequency drift compensation and temperature compensation on the phase to reduce the error, thereby obtaining the static strain value of the optical fiber, that is, the signal is demodulated by the grating array sensing unit and interference, and through temperature decoupling, a high-speed, high-spatial-resolution, and large-range static strain distribution measurement method can be realized. When applied to infrastructure, the structural changes of the structure can be quickly and accurately detected, thereby obtaining the safe state of the infrastructure structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A method flow chart of an embodiment of a static strain measurement method based on a grating array provided by the present invention; Figure 2 A schematic diagram of the principle of phase and wavelength provided by the present invention; Figure 3 A schematic diagram of the principle of interference demodulation provided by the present invention; Figure 4 A schematic diagram of the interference principle provided by the present invention; Figure 5 A schematic diagram of the structure of a Mach-Zehnder interferometer based on a 3×3 coupler provided by the present invention; Figure 6 One of the structural schematic diagrams of an embodiment of a static strain measurement system based on a grating array provided by the present invention; Figure 7 A second structural schematic diagram of an embodiment of a static strain measurement system based on a grating array provided by the present invention; Figure 8 A schematic structural diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone.

[0022] The descriptions of "first", "second", etc. involved in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0023] Figure 1 A method flow chart of an embodiment of a static strain measurement method based on a grating array provided by the present invention, such as Figure 1 As shown, the static strain measurement method based on grating array includes: S101, obtaining a reflection signal obtained by a chirped grating array reflecting a laser pulse signal; the laser pulse signal is emitted by a grating array acoustic wave demodulator; S102, performing interference demodulation on the reflected signal to determine the phase of the reflected signal; S103, performing optical frequency drift compensation and temperature compensation on the phase to obtain a static strain value of the optical fiber.

[0024] It should be noted that the grating array acoustic wave demodulator can emit a laser pulse signal, and the chirped grating array can reflect the laser pulse signal to obtain a reflected signal. The reflected signal can generate interference in the grating array acoustic wave demodulator, and the signal strength can be obtained through interference, and the phase of the reflected signal can be obtained by interferometric demodulation of the reflected signal.

[0025] Compared with the prior art, the static strain measurement method based on the grating array provided in the embodiment of the present invention emits a laser pulse signal through a grating array acoustic demodulator, reflects the laser pulse signal through a chirped grating array to obtain a reflected signal, performs interference demodulation on the reflected signal to obtain the phase of the reflected signal, and performs optical frequency drift compensation and temperature compensation on the phase to reduce the error, thereby obtaining the static strain value of the optical fiber, that is, the signal is demodulated by the grating array sensing unit and interference, and through temperature decoupling, a high-speed, high-spatial-resolution, and large-range static strain distribution measurement method can be realized. When applied to infrastructure, the structural changes of the structure can be quickly and accurately detected, thereby obtaining the safety status of the infrastructure structure.

[0026] In some embodiments of the present invention, performing optical frequency drift compensation and temperature compensation on the phase to obtain a static strain value of the optical fiber includes: Performing optical frequency drift compensation and temperature compensation on the phase to determine a compensated phase; Determining a length change of the optical fiber based on the compensated phase; The static strain value is determined based on the length change of the optical fiber.

[0027] In some embodiments of the present invention, the expression for the change in length of the optical fiber is as follows:

[0028] in, Indicates the change in length of the optical fiber, represents the phase after compensation, represents the wavelength of the light source, Represents the refractive index of optical fiber.

[0029] For example, Figure 2 A schematic diagram of the principle of phase and wavelength provided by the present invention, such as Figure 2 As shown, when the ambient temperature of the optical fiber changes, the length of the optical fiber will change linearly with the temperature. When the wavelength of light is constant, the change in the length of the optical fiber will cause the number of installed light wavelengths to change.

[0030] Figure 3 A schematic diagram of the principle of interference demodulation provided by the present invention, such as Figure 3 As shown in the figure, in an actual system, if the spacing between the grating arrays is 5 meters, then 3225556 light wavelengths (light source 1550.12nm) can be accommodated between the two gratings. Static strain demodulation technology uses interferometric demodulation technology to achieve wavelength measurement between two grating arrays.

[0031] Figure 4A schematic diagram of the interference principle provided by the present invention, such as Figure 4 As shown, interference can be understood as the addition of two light waves. When two light waves interfere, for example: The first light path y1=cos(w0t + 0), and the second light path y2=cos(w1t +2π).

[0032] Interference is: y1+y2=cos(w0t + 0)+ cos(w1t + 2π).

[0033] When the light frequency is constant (kHz level), w0 = w1, then △φ = φ1- φ2 = 2π.

[0034] In fact, one light path has one more whole cycle of wavelength than the other light path. Here, one wavelength is 1550.12nm.

[0035] In the embodiment of the present invention, a laser pulse is emitted by a grating array acoustic wave demodulator, and then a reflected signal of a chirped grating array is received. The reflected signal generates interference in the grating array acoustic wave demodulator, and the signal strength is obtained by interference. .

[0036] According to the interference theory of light, when two coherent beams of light interfere at any point, the interference light intensity at that point is:

[0037] in, represents the total light intensity after interference, and represent the intensity of the two light waves respectively, Represents the phase difference between two light waves.

[0038] The reflected signal is interferometrically demodulated by an interferometer. In the embodiment of the present invention, a Mach-Zehnder interferometer based on a symmetrical 3×3 coupler is used. Figure 5 A schematic structural diagram of a Mach-Zehnder interferometer based on a 3×3 coupler provided by the present invention.

[0039] Through classical theoretical analysis, we can obtain the following relationship between the signals of the three-way detector and the signals reflected by the chirped grating array:

[0040]

[0041]

[0042] in, , and Respectively represent the signal strength of the three detectors, Represents the total light intensity after interference.

[0043] Through the above three-variable cubic equation, the current phase φ (ξ in the formula) can be demodulated. Here, the demodulated phase φ = φ1-φ2, which is the phase difference between the two light paths, can be directly understood as the difference in the wavelengths of the two light paths.

[0044] According to the classical theoretical formula, the output signal of the grating array acoustic wave sensor system is the phase change of the light wave after passing through the optical fiber between adjacent gratings. , and the change in temperature of the optical fiber , the length change of the optical fiber due to strain , wavelength change of light source , Instrument internal disturbance signal , the refractive index change of the optical fiber Related, the refractive index change of the optical fiber , The expression is as follows:

[0045] The use of a compensator can eliminate the drift caused by the light frequency, and the use of temperature compensation can decouple the temperature effect on the strain, thereby eliminating the influence of external factors (instability of the light source frequency and changes in ambient temperature) on the measurement results.

[0046] Further obtaining a separate measurement of strain yields The expression is as follows:

[0047] That is, φ is calculated by the above formula, so, The expression is as follows:

[0048] in, Indicates the change in length of the optical fiber, represents the phase after compensation, represents the wavelength of the light source, Represents the refractive index of optical fiber, n=1.468 (G.652).

[0049] The strain value can be further obtained: (L=5 meters).

[0050] The static strain measurement method based on the grating array provided in the embodiment of the present invention realizes signal demodulation through the grating array sensing unit and interference, and through temperature decoupling, can realize a high-speed, high-spatial-resolution, and large-range static strain distribution measurement method. When applied to infrastructure, the structural changes of the structure can be quickly and accurately detected, thereby obtaining the safe status of the infrastructure structure.

[0051] Figure 6 One of the structural schematic diagrams of an embodiment of a static strain measurement system based on a grating array provided by the present invention is as follows Figure 6 As shown, the grating array-based static strain measurement system 600 includes: Grating array acoustic wave demodulator 610, optical interface 620 and chirped grating array 630; The grating array acoustic wave demodulator 610 is connected to the chirped grating array 630 via the optical interface 620; The grating array acoustic wave demodulator 610 is used to emit laser pulse signals; The chirped grating array 630 is used to reflect the laser pulse signal to obtain a reflected signal; The optical interface 620 is used to send the laser pulse signal to the chirped grating array 630 , and to send the reflected signal to the grating array acoustic wave demodulator 610 .

[0052] The output end of the grating array acoustic wave demodulator is connected to an optical interface for transmitting laser pulses and receiving return light signals.

[0053] The optical interface is connected to the output end of the grating array acoustic wave demodulator and is used to send the laser pulse to the chirped grating array.

[0054] The chirped grating array is connected to the optical interface and receives the laser pulse signal of the grating array acoustic wave demodulator, and each chirped grating reflects the input light.

[0055] When the static strain measurement system based on the grating array provided by the present invention is working, the grating array acoustic wave demodulator emits laser pulses and then receives the reflected signal of the chirped grating array. The reflected signal generates interference in the grating array acoustic wave demodulator, and the signal strength is obtained by interference. .

[0056] The present invention adopts Figure 5 By demodulating the interferometer shown, the relationship between the signals of the three detectors and the signals reflected by the chirped grating array can be obtained, thereby demodulating the phase φ of the reflected signal. The phase is compensated for optical frequency drift and temperature to reduce the error, thereby obtaining the strain value.

[0057] The static strain measurement system based on the grating array provided in the embodiment of the present invention realizes signal demodulation through the grating array sensing unit and interference, and through temperature decoupling, can realize a high-speed, high-spatial-resolution, and large-range static strain distribution measurement method. When applied to infrastructure, it can implement rapid and accurate detection of structural changes of the structure, thereby obtaining the safe status of the infrastructure structure.

[0058] In some embodiments of the present invention, the grating array acoustic wave demodulator is also used for: The reflected signal is interferometrically demodulated by an interferometer to determine the phase of the reflected signal.

[0059] In some embodiments of the present invention, the interferometer is a Mach-Zehnder interferometer based on a 3×3 coupler.

[0060] In some embodiments of the present invention, the chirped grating array is a chirped grating array compounded into OPGW / OPPC.

[0061] In some embodiments of the present invention, the optical interface is further used for: Separate the communication fiber optic signal and the sensor grating signal.

[0062] For example, Figure 7 The second structural diagram of an embodiment of a static strain measurement system based on a grating array provided by the present invention is as follows Figure 7 As shown, the static strain measurement system based on grating array includes: Grating array acoustic wave demodulator, optical interface and chirped grating array integrated into OPGW / OPPC.

[0063] The output end of the grating array acoustic wave demodulator is connected to an optical interface for transmitting laser pulses and receiving return light signals.

[0064] The optical interface is connected to the output of the grating array acoustic demodulator to send the laser pulse to the chirped grating array that is compounded into the OPGW / OPPC. In practical applications, the optical interface is different from the traditional communication connector. It needs to separate the communication fiber signal and the sensor grating signal. Due to the requirements of sensing, there are very high loss control requirements.

[0065] The chirped grating array composited into OPGW / OPPC is connected to the optical interface to receive the laser pulse signal of the grating array acoustic wave demodulator. At the same time, each chirped grating reflects the input light with a reflection ratio of 0.01% (1000 times stronger than the sensor signal of the communication optical fiber). The spacing of the chirped grating is usually 2 meters, which can be directly understood as a spatial resolution of 2 meters.

[0066] When the static strain measurement system based on grating array provided by the present invention is working, the grating array acoustic wave demodulator emits laser pulses, and then receives the reflected signal of the chirped grating array compounded into OPGW / OPPC. The reflected signal generates interference in the grating array acoustic wave demodulator, and the signal strength is obtained through interference. .

[0067] According to the interference theory of light, when two coherent beams of light interfere at any point, the interference light intensity at that point is:

[0068] in, represents the total light intensity after interference, and represent the intensity of the two light waves respectively, Represents the phase difference between two light waves.

[0069] The present invention adopts Figure 5 The interferometer shown is used for demodulation. Through classical theoretical analysis, it can be obtained that the signals of the three-way detectors and the signals reflected by the chirped grating array have the following relationship:

[0070]

[0071]

[0072] in, , and Respectively represent the signal strength of the three detectors, Represents the total light intensity after interference.

[0073] Through the above three-variable cubic equation, the current phase φ (ξ in the formula) can be demodulated. Here, the demodulated phase φ = φ1-φ2, which is the phase difference between the two light paths, can be directly understood as the difference in the wavelengths of the two light paths.

[0074] According to the classical theoretical formula, the output signal of the grating array acoustic wave sensor system is the phase change of the light wave after passing through the optical fiber between adjacent gratings. , and the change in temperature of the optical fiber , the length change of the optical fiber due to strain , wavelength change of light source , Instrument internal disturbance signal , the refractive index change of the optical fiber Related, the refractive index change of the optical fiber , The expression is as follows:

[0075] The use of a compensator can eliminate the drift caused by the light frequency, and the use of temperature compensation can decouple the temperature effect on the strain, thereby eliminating the influence of external factors (instability of the light source frequency and changes in ambient temperature) on the measurement results.

[0076] Further obtaining a separate measurement of strain yields The expression is as follows:

[0077] That is, φ is calculated by the above formula, so, The expression is as follows:

[0078] in, Indicates the change in length of the optical fiber, represents the phase after compensation, represents the wavelength of the light source, Represents the refractive index of optical fiber, n=1.468 (G.652).

[0079] The strain value can be further obtained: (L=5 meters).

[0080] The static strain measurement system based on the grating array provided in the embodiment of the present invention can realize nanometer-level to micrometer-level measurement, and has the following advantages by using the acoustic wave strain demodulation technology: (1) Ultra-low frequency detection: static strain detection using acoustic wave technology can achieve signal detection and measurement at the 0.0001 Hz level, which can effectively detect slow structural changes in infrastructure.

[0081] (2) High speed: Static strain measurement using acoustic wave technology can achieve kHz-level measurements, which is much higher than the 0.1 Hz-level rate of distributed optical fiber.

[0082] (3) High spatial resolution: static strain measured by grating array can achieve arbitrary resolution measurement from 1 meter, 2 meters to tens of meters.

[0083] (4) Large range: static strain measurement achieved through grating array can achieve measurement from 0.01uξ level to 2000uξ.

[0084] like Figure 8 As shown, the present invention also provides an electronic device 800. The electronic device 800 includes a processor 801, a memory 802 and a display 803. Figure 8Only some components of the electronic device 800 are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0085] In some embodiments, the processor 801 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 802, such as the static strain measurement method based on the grating array in the present invention.

[0086] In some embodiments, the processor 801 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, the processor 801 may be local or remote. In some embodiments, the processor 801 may be implemented in a cloud platform. In some embodiments, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-cloud, etc., or any combination thereof.

[0087] In some embodiments, the memory 802 may be an internal storage unit of the electronic device 800, such as a hard disk or memory of the electronic device 800. In other embodiments, the memory 802 may also be an external storage device of the electronic device 800, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped on the electronic device 800.

[0088] Furthermore, the memory 802 may include both an internal storage unit of the electronic device 800 and an external storage device. The memory 802 is used to store application software installed in the electronic device 800 and various data.

[0089] In some embodiments, the display 803 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an organic light-emitting diode (OLED) touch device, etc. The display 803 is used to display information on the electronic device 800 and to display a visual user interface. The components 801-803 of the electronic device 800 communicate with each other via a system bus.

[0090] In one embodiment, when the processor 801 executes the grating array-based static strain measurement program in the memory 802, the following steps may be implemented: Acquiring a reflection signal obtained by reflecting a laser pulse signal by a chirped grating array; the laser pulse signal is emitted by a grating array acoustic wave demodulator; Performing interference demodulation on the reflected signal to determine the phase of the reflected signal; Optical frequency drift compensation and temperature compensation are performed on the phase to obtain a static strain value of the optical fiber.

[0091] It should be understood that: when the processor 801 executes the grating array-based static strain measurement program in the memory 802 , in addition to the above functions, other functions may also be implemented, and details may refer to the description of the corresponding method embodiments above.

[0092] Furthermore, the embodiment of the present invention does not specifically limit the type of the electronic device 800 mentioned, and the electronic device 800 may be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, a laptop computer, etc. Exemplary embodiments of portable electronic devices include but are not limited to portable electronic devices equipped with IOS, Android, Microsoft or other operating systems. The above-mentioned portable electronic devices may also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, the electronic device 800 may not be a portable electronic device, but a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0093] Accordingly, an embodiment of the present invention also provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, it can implement the steps or functions of the static strain measurement method based on the grating array provided in the above-mentioned method embodiments.

[0094] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0095] The static strain measurement method, system and electronic device based on the grating array provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A static strain measurement method based on a grating array, characterized in that: include: Acquiring a reflection signal obtained by reflecting a laser pulse signal by a chirped grating array; the laser pulse signal is emitted by a grating array acoustic wave demodulator; Performing interference demodulation on the reflected signal to determine the phase of the reflected signal; Optical frequency drift compensation and temperature compensation are performed on the phase to obtain a static strain value of the optical fiber.

2. The static strain measurement method based on grating array according to claim 1, characterized in that: The performing optical frequency drift compensation and temperature compensation on the phase to obtain a static strain value of the optical fiber includes: Performing optical frequency drift compensation and temperature compensation on the phase to determine a compensated phase; Determining a length change of the optical fiber based on the compensated phase; The static strain value is determined based on the length change of the optical fiber.

3. The static strain measurement method based on grating array according to claim 2, characterized in that: The expression of the length variation of the optical fiber is as follows: in, Indicates the change in length of the optical fiber. represents the phase after compensation, represents the wavelength of the light source, Represents the refractive index of optical fiber.

4. A static strain measurement system based on a grating array, characterized in that: include: Grating array acoustic wave demodulator, optical interface and chirped grating array; The grating array acoustic wave demodulator is connected to the chirped grating array via the optical interface; The grating array acoustic wave demodulator is used to emit laser pulse signals; The chirped grating array is used to reflect the laser pulse signal to obtain a reflected signal; The optical interface is used to send the laser pulse signal to the chirped grating array, and to send the reflected signal to the grating array acoustic wave demodulator.

5. The static strain measurement system based on grating array according to claim 4, characterized in that: The grating array acoustic wave demodulator is also used for: The reflected signal is interferometrically demodulated by an interferometer to determine the phase of the reflected signal.

6. The static strain measurement system based on grating array according to claim 5, characterized in that: The interferometer is a Mach-Zehnder interferometer based on a 3×3 coupler.

7. The static strain measurement system based on grating array according to claim 4, characterized in that: The chirped grating array is a chirped grating array compounded into OPGW / OPPC.

8. The static strain measurement system based on grating array according to claim 4, characterized in that: The optical interface is also used for: Separate the communication fiber optic signal and the sensor grating signal.

9. An electronic device, characterized in that: comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory, and is used to execute the program stored in the memory to implement the static strain measurement method based on the grating array as described in any one of claims 1 to 3.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the static strain measurement method based on a grating array as claimed in any one of claims 1 to 3 is implemented.

Images