Fiber bragg grating strain measurement system and method and computer equipment

Abstract

The invention relates to a fiber bragg grating strain measurement system and method and computer equipment. The fiber bragg grating strain measurement system comprises a fiber bragg grating and a fiber bragg grating lever structure, and the fiber bragg grating lever structure comprises a fixed structure part and a first connecting structure part; the fiber grating is fixed between the fixed structure part and the first connecting structure part, the fixed structure part is fixedly connected with an object to be measured, and the fixed structure part is detachably connected with the first connecting structure part; the fixed structure part is used for transmitting an initial strain corresponding to the object to be measured to the first connecting structure part, the first connecting structure part is used for amplifying the initial strain into a target strain, and the fiber bragg grating is used for measuring the target strain. The system can improve the detection sensitivity of the fiber grating sensor.

Description

Technical Field

[0001] The present application relates to the field of optical fiber sensor monitoring technology, and in particular to an optical fiber Bragg grating strain measurement system, method and computer equipment. Background Art

[0002] With the continuous development of science and technology, the power sector has entered a new era of high parameters, large capacity, ultra-high voltage and high automation. With the further increase in the level and capacity of the power grid, higher requirements are placed on the safe operation and output reliability of the power grid system. Among them, power equipment, as the core of the power system, is responsible for the conversion, transmission and distribution of electric energy. Therefore, regular maintenance of power equipment is very necessary, such as the maintenance of transformers.

[0003] During the operation of the transformer, it is inevitable that the transformer winding will be deformed due to the influence of natural or human factors, which may eventually lead to transformer failure or even explosion. Therefore, the health status of the transformer winding can be monitored by the strain change of the transformer winding. The strain of the transformer winding can be detected by the fiber grating sensor.

[0004] In order to meet the long-term and stable strain monitoring needs of fiber grating sensors, it is usually necessary to package the fiber grating sensors, such as substrate packaging. However, due to the large differences in the working conditions of the transformer windings under micro-strain, and the relatively fixed strain measurement range of the fiber grating sensor, it is impossible to capture the strain changes of the transformer windings under micro-strain, which makes it easy to detect the strain of the transformer windings incorrectly. Therefore, the detection sensitivity of the current fiber grating sensors is low. Summary of the invention

[0005] Based on this, it is necessary to provide a fiber Bragg grating strain measurement system, method and computer equipment that can improve the detection sensitivity of the fiber Bragg grating sensor in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a fiber Bragg grating strain measurement system, the fiber Bragg grating strain measurement system comprising a fiber Bragg grating and a fiber Bragg grating lever structure, wherein the fiber Bragg grating lever structure comprises a fixed structure portion and a first connecting structure portion;

[0007] The fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part, the fixed structure part is fixedly connected to the object to be measured, and the fixed structure part and the first connecting structure part are detachably connected;

[0008] The fixed structure part is used to transfer the initial strain corresponding to the object to be measured to the first connection structure part, the first connection structure part is used to amplify the initial strain into a target strain, and the fiber Bragg grating is used to measure the target strain.

[0009] In the second aspect, the present application also provides a fiber Bragg grating packaging method, which is applied to a fiber Bragg grating strain measurement system, wherein the fiber Bragg grating strain measurement system includes a fiber Bragg grating and a fiber Bragg grating lever structure, wherein the fiber Bragg grating lever structure includes a fixed structure portion and a first connecting structure portion, wherein the fiber Bragg grating is fixed between the fixed structure portion and the first connecting structure portion, wherein the fixed structure portion is fixedly connected to an object to be measured, and wherein the fixed structure portion and the first connecting structure portion are detachably connected, wherein the method includes: transmitting an initial strain corresponding to the object to be measured to the first connecting structure portion via the fixed structure portion; amplifying the initial strain to a target strain via the first connecting structure portion; and measuring the target strain via the fiber Bragg grating.

[0010] In a third aspect, the present application also provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the following steps when executing the computer program: transmitting the initial strain corresponding to the object to be measured to the first connecting structure part through the fixed structure part; amplifying the initial strain into a target strain through the first connecting structure part; and measuring the target strain through the fiber grating.

[0011] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the following steps: transmitting the initial strain corresponding to the object to be measured to the first connecting structure part through the fixed structure part; amplifying the initial strain into a target strain through the first connecting structure part; and measuring the target strain through the fiber grating.

[0012] In a fifth aspect, the present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the following steps: obtaining an initial strain corresponding to the object to be measured; amplifying the initial strain to a target strain; and measuring the target strain.

[0013] The fiber Bragg grating strain measurement system, method and computer device mentioned above, the fiber Bragg grating strain measurement system is composed of a fiber Bragg grating and a fiber Bragg grating lever structure, wherein the fiber Bragg grating lever structure includes a fixed structure part and a first connecting structure part, the fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part, that is, the fiber Bragg grating is fixed on the fiber Bragg grating lever structure, and at the same time, the fixed structure part of the fiber Bragg grating lever structure is fixedly connected to the object to be measured, that is, the fixed structure part can transfer the initial strain corresponding to the object to be measured, and the first connecting structure part and the fixed structure part are detachably connected, that is, the structural relationship between the fixed structure part and the first connecting structure part is adjustable, and because the first connecting structure part can amplify the initial strain to the target strain, by adjusting the fixed structure part and the first connecting structure part The structural relationship between the parts can change the amplification ability of the first connecting structure part for the initial strain, and finally the target strain can be measured by the fiber Bragg grating fixed between the fixed structure part and the first connecting structure part. Since the fiber Bragg grating lever structure of the fiber Bragg grating strain measurement system can amplify the initial strain corresponding to the object to be measured, the fiber Bragg grating can capture the strain change of the object to be measured through the target strain with a larger numerical value. Therefore, the technical defect that the working state of the transformer winding under micro-strain is greatly different and the strain measurement range of the fiber Bragg grating sensor is relatively fixed, which makes it difficult to capture the strain change of the transformer winding under micro-strain, and thus makes it easy to detect the strain of the transformer winding incorrectly, is overcome. Therefore, the detection sensitivity of the fiber Bragg grating sensor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of the structure of a fiber Bragg grating strain measurement system in one embodiment;

[0016] Figure 2 A schematic diagram of a double-layer fiber grating lever structure in one embodiment;

[0017] Figure 3 A schematic diagram of the structure of a fiber protection sleeve in one embodiment;

[0018] Figure 4 is a schematic structural diagram of another fiber Bragg grating strain measurement system in one embodiment;

[0019] Figure 5is a schematic structural diagram of a first connecting structural part in an embodiment;

[0020] Figure 6 A schematic diagram of a process of a fiber Bragg grating packaging method in one embodiment;

[0021] Figure 7 A schematic diagram of strain amplification of a fiber Bragg grating lever structure in a fiber Bragg grating packaging method according to an embodiment;

[0022] Figure 8 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] First of all, it should be understood that power equipment is very important to the power system. Once a failure occurs, it will bring huge economic losses and system safety risks. At present, power companies usually regularly inspect and maintain power equipment to achieve inspection and maintenance of power equipment. Although this method can ensure the safety of power equipment to a certain extent, it also has obvious disadvantages. On the one hand, each regular inspection of power equipment requires corresponding power outage operations, including equipment-level and network-level operations, which affects the continuity of power supply and adds additional operation and maintenance costs. On the other hand, the defect detection of power equipment focuses on detection sensitivity and reflects the long-term The state changes on a time scale (such as months, years and several years, etc.), so regular maintenance has serious defects for short time scales (minutes, hours and days, etc.), and the judgment accuracy will be insufficient. When the defects cannot be discovered in time and continue to evolve into internal faults, they may have caused serious damage to the power equipment; taking the transformer as an example, by detecting the strain of the core component of the transformer "transformer winding", the health status of the transformer can be accurately monitored. During the operation of the transformer, it will be affected by various factors, such as natural factors such as direct lightning overvoltage and induced lightning overvoltage, as well as operational overvoltage, operation overvoltage and so on. Transmission bumps or hoisting vibrations and other human factors will inevitably cause winding deformation in this process, and winding deformation will lead to power transformer failure or even explosion, causing huge economic losses and serious safety hazards. At the same time, since the health status of the transformer winding can usually be reflected by the strain change of the transformer winding, that is, the change of the winding mechanical strain is closely related to the decline of the transformer performance, it is necessary to accurately detect the transformer winding strain. Under normal circumstances, the transformer winding strain can be detected by a fiber grating sensor. The fiber grating sensor has the advantages of strong anti-electromagnetic interference ability and high accuracy, and can effectively solve the problem that traditional electrical sensors are susceptible to complex electromagnetic interference in the operating environment. However, since the fiber grating is relatively fragile and easily damaged without any protection, it is difficult to meet the long-term stable strain monitoring. Moreover, due to the large difference in the working state of the transformer winding under micro-strain, the strain measurement range of the fiber grating sensor is relatively fixed, which makes it impossible to capture the strain change of the transformer winding under micro-strain, which makes it easy to detect the transformer winding strain incorrectly. Therefore, there is an urgent need for a fiber grating system that can improve the detection sensitivity of the fiber grating sensor.

[0025] In one embodiment, Figure 1As shown, a fiber Bragg grating strain measurement system is provided, which includes a fiber Bragg grating lever structure 102 and a fiber Bragg grating 104, wherein the fiber Bragg grating lever structure includes a fixed structure part 1001 and a first connecting structure part 1002; the fiber Bragg grating 102 is fixed between the fixed structure part 1001 and the first connecting structure part 1002, the object to be measured 106 is fixedly connected to the fixed structure part 1001, and the fixed structure part 1001 and the first connecting structure part 1002 are detachably connected; the fixed structure part 1001 is used to transfer the initial strain corresponding to the object to be measured 106 to the first connecting structure part 1002, the first connecting structure part 1002 is used to amplify the initial strain into a target strain, and the fiber Bragg grating is used to measure the target strain.

[0026] It should be noted that the main function of the fiber Bragg grating strain measurement system is to provide certain protection for the fiber Bragg grating and enhance the measurement sensitivity of the fiber Bragg grating to strain. The fiber Bragg grating measures strain (tension, compression or bending, etc.) through the feedback of the central wavelength shift of the fiber Bragg grating caused by the change of the internal refractive index. It can be understood that the fiber Bragg grating system mainly includes a test object that provides the strain to be detected, and a fiber Bragg grating sensor composed of a fiber Bragg grating and a fiber Bragg grating lever structure, wherein the fiber Bragg grating is the main component for measuring strain. The fiber Bragg grating lever structure is used to encapsulate the fiber Bragg grating to prevent the fiber Bragg grating from being easily damaged in an exposed state. On the other hand, the lever structure composed of a detachably connected fixed structure part and a first connecting structure part is used to amplify the strain of the object to be measured through the lever amplification theory. The object to be measured can be a transformer winding or a capacitor winding, etc., and the fiber Bragg grating sensor can be a fiber Bragg grating strain sensor.

[0027] It should be noted that the fiber Bragg grating lever structure can be called a "lever amplification support base", which can be specifically a planar asymmetric lever structure. During the packaging process of the fiber Bragg grating, the fiber Bragg grating needs to be firstly fixed and packaged on the fiber Bragg grating lever structure, that is, the fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part of the fiber Bragg grating lever structure. For example, in one feasible method, when the fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part, a certain pre-strain is applied between the fixed structure part and the first connecting structure part, so that the optical fiber is in a taut state while being fixed, so as to avoid the subsequent fiber Bragg grating being compressed during the sensing process and not being able to accurately reflect the micro-strain at the μɛ level. After the fiber Bragg grating is fixed, it is left to stand for 1-2 days, waiting for the fixing of the fiber Bragg grating, the fixed structure part and the first connecting structure part. The adhesive of a connecting structure is solidified, and a performance test is performed on it after solidification. After the performance test, a fiber Bragg grating strain sensor composed of a fiber Bragg grating lever structure and a fiber Bragg grating is fixed to the surface of a transformer winding to detect strain. Since there is a fulcrum in the fiber Bragg grating strain sensor, the fiber Bragg grating lever structure of the fiber Bragg grating strain sensor can be simplified into a complete lever structure according to the strain concentration and lever amplification theory. Since the fixed structure part and the object to be measured are fixedly connected, the initial strain of the transformer winding can be directly transmitted to the first connecting structure part through the fixed structure part. The first connecting structure part then uses the lever amplification theory to amplify the initial strain into a target strain, and finally the fixed fiber Bragg grating is used to measure the target strain, wherein the target strain refers to the strain actually measured.

[0028] It can be understood that the connection method for fixed connection between the fixed structure part and the object to be measured, the fixed structure part and the optical fiber Bragg grating, and the optical fiber Bragg grating and the first connecting structure part can be specifically a method of coating with high-strength organic glue, such as epoxy resin glue, and the connection method for detachable connection between the fixed structure part and the first connecting structure part can be specifically a method of riveting the fixed structure part and the first connecting structure part. The fixed structure part can be either an integrated structure or a non-integrated structure. For example, in one feasible method, the fixed structure part is composed of two symmetrically designed fixed plates. The fixed plates are coated at different positions with high-strength organic glue to achieve the purpose of fixed connection between the fixed structure part and the object to be measured.

[0029] Since the fixed structure part of the fiber Bragg grating lever structure can transmit the initial strain and the first connecting structure part can amplify the initial strain, when the initial strain of the object to be measured is microstrain, the fiber Bragg grating can also be measured after the initial strain is amplified, thereby broadening the strain measurement range of the fiber Bragg grating and accurately capturing the strain changes of the object to be measured under microstrain, rather than directly relying on a relatively fixed range to measure the strain of the object to be measured. Therefore, the detection sensitivity of the current fiber Bragg grating is improved.

[0030] In one embodiment, Figure 2 As shown, Figure 2 The schematic diagram of the structure of the double-layer fiber Bragg grating lever structure is shown, that is, the fiber Bragg grating lever structure 104 includes a first lever structure 1003 and a second lever structure 1004, wherein the first lever structure 1003 and the second lever structure 1004 are respectively fixedly connected to the second connecting structure part 108 of the fiber Bragg grating strain measurement system, and the first lever structure 1003 is nested in the second lever structure 1004; wherein the second connecting structure part 108 is used to connect the first lever structure 1003 and the second lever structure 1004, the first lever structure 1003 is used to amplify the initial strain to the target strain, and the second lever structure 1004 is used to protect the first lever structure 1003.

[0031] It should be noted that the fiber Bragg grating strain sensor needs to meet the long-term stable measurement requirements in some strain measurement scenarios, so a double-layer fiber Bragg grating lever structure with inner and outer nesting can be set. Through the inner and outer nesting relationship between different fiber Bragg grating lever structures, the outer second lever structure protects the inner first lever structure, and the fixed connection between the first lever structure and the second lever structure can be a welding fixation method. For example, in one feasible method, the second connection structure portion is composed of a welded part, wherein the materials for preparing the first lever structure and the second lever structure can be the same, for example, both are high-strength elastic structures, and the first lever structure and the second lever structure can be bent and coated on the surface of the object to be measured, and the fiber Bragg grating is fixed to the first lever structure, and the second lever structure effectively protects the fiber Bragg grating from the influence of the external environment.

[0032] It should be noted that, in addition to the first lever structure and the second lever structure being fixedly connected by the second connecting structure portion, the first lever structure and the second lever structure can both be fixed to the surface of the object to be measured. For example, in one feasible method, by welding the fixed structure portions of the first lever structure and the second lever structure to the surface of the object to be measured, since the second lever structure is exposed to the external environment, and thus in the process of long-term stable monitoring of the strain changes of the object to be measured, the second lever structure can resist the erosion of the external environment and avoid the influence of the external environment on the strain monitoring results, while the first lever structure can still amplify the initial strain to the target strain through the lever amplification theory. Therefore, the fiber Bragg grating strain measurement system can improve the sensitivity of strain detection of the object to be measured through the first lever structure, and can also improve the accuracy of strain detection of the object to be measured through the second lever structure.

[0033] In one embodiment, the first lever structure is made of a rigid material having an elastic modulus greater than a preset elastic modulus threshold, and the second lever structure is made of a flexible material having a corrosion rate less than a preset corrosion rate threshold. The first lever structure and the second lever structure are mechanically fixedly connected by a second connecting structure.

[0034] It should be noted that, taking into account the difference in functions achieved by the first lever structure and the second lever structure, different preparation materials may be used for the first lever structure and the second lever structure during the preparation of the first lever structure and the second lever structure, and corresponding preparation materials are selected for preparation with emphasis on the functions of the lever structures, wherein the elastic modulus reflects the rigidity of the lever structure, and the corrosion rate reflects the corrosion resistance of the lever structure. The preset elastic modulus threshold and the preset corrosion rate threshold can be set according to needs, that is, the first lever structure is a high-strength material, specifically steel, aluminum alloy, titanium alloy, advanced high-strength steel, and composite materials, and the second lever structure is a corrosion-resistant material, specifically alloy materials, polymer materials, and nickel-based alloys, etc.

[0035] It should be noted that, due to the different measurement environments of different fiber Bragg grating strain measurement systems, the degree of erosion of the outermost second lever structure of the fiber Bragg grating strain measurement system is different, which leads to different service lives of the first lever structure and the second lever structure. In order to facilitate the replacement of the second lever structure at any time, the first lever structure and the second lever structure can be mechanically fixedly connected through a second connecting structure. For example, the second connecting structure can specifically be a hinge, a buckle, a pin, a sleeve, and a thread.

[0036] Since the preparation materials of the first lever structure and the second lever structure are selected based on their functions respectively, and different lever structures for amplifying different functions are prepared in the fiber Bragg grating strain measurement system using the prepared materials, and at the same time, since the service life of different lever structures is different, the first lever structure and the second lever structure can be connected by mechanical fixation, so as to facilitate the disassembly and replacement of the second lever structure. Therefore, while taking into account the detection sensitivity and detection effect of the fiber Bragg grating, the packaging flexibility of the fiber Bragg grating strain measurement system is improved.

[0037] In one embodiment, referring to Figure 3 , Figure 3 Schematic diagram of the structure of the fiber protection sleeve. The system also includes a fiber protection sleeve 110. The fiber protection sleeve 110 is sleeved on the optical fiber tails at both ends of the fiber grating. The fiber grating is fixed between the fixed structure part and the first connecting structure part by a polymer.

[0038] It should be noted that when the optical fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part, there may be a difference between the size of the fixed structure part and the first connecting structure part and the size of the optical fiber Bragg grating, and thus a fiber protection sleeve may be provided at the pigtail near the fixed structure part and the pigtail near the first connecting structure part, and the fiber protection sleeve is used to protect the tails at both ends of the optical fiber Bragg grating, and the optical fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part by a polymer, wherein the polymer may specifically be an adhesive, and the relationship between the fiber protection sleeve and the fixed structure part and the first connecting structure part is not specifically limited in this embodiment. For example, in one feasible method, the optical fiber Bragg grating is fixed between the first connecting structure part and the fixed structure part by glue, and then after the glue is completely cured, two fiber protection sleeves are respectively inserted into the left and right ends of the optical fiber Bragg grating, wherein different fiber protection sleeves can be fixed by glue when being fixed to the first connecting structure part and the fixed structure part, and can also be fixed by limiting grooves provided on the fixed structure part and the first connecting structure part.

[0039] In one embodiment, the fixed connection method between the fixed structure part and the object to be tested includes one of the following: the fixed structure part is fixed to the object to be tested by an adhesive matrix material; the fixed structure part is welded to the object to be tested; the fixed structure part is mechanically fixedly connected to the object to be tested.

[0040] It should be noted that, for different objects to be tested, different connection methods can be adopted to connect the object to be tested and the fixed structure part, wherein the adhesive matrix material can specifically be epoxy resin. If the fixed structure part is fixed to the object to be tested through the adhesive matrix material, the object to be tested and the fixed structure part can be fixed through the adhesive matrix material, and other parts do not need to be fixed. The fixed structure part can also be welded to the object to be tested, wherein the size of the welding area between the fixed structure part and the object to be tested is set by the user according to the welding requirements. In addition, the fixed structure part can also be mechanically fixed to the object to be tested. For example, in one feasible method, bolt holes are added at specified positions of the fixed structure part, and threaded holes are processed at specified positions of the object to be tested, and the fixed structure part is fixedly connected to the object to be tested by bolt connection.

[0041] In one embodiment, Figure 4 As shown, Figure 4 The structural diagram of another fiber Bragg grating strain measurement system is shown in FIG. 1 , wherein the fixed structure 1001 includes a first fixed structure 11 and a second fixed structure 12, the first connection structure 1002 includes a support structure 13, a lever structure 14 and an adjustment structure 15, the lever structure 14 includes a first connection surface 21 and a second connection surface 22, and the initial strain includes a first initial strain component and a second initial strain component; one end of the support structure 13 is vertically connected to the first fixed structure 11, the other end of the support structure 13 is vertically connected to the lever structure 14 through the first connection surface, and one end of the adjustment structure 15 is vertically connected to the lever structure 14 through the first connection surface. The other end of the adjusting structure 15 is vertically connected to the second fixed structure 12 through the second connecting surface, and the first fixed structure 11 and the second fixed structure 12 are both fixed to the object to be measured 106; wherein the first fixed structure 11 is used to transfer the first initial strain component to the supporting structure 13, and the second fixed structure 12 is used to transfer the second initial strain component to the adjusting structure 15; the supporting structure 13 is used to transfer the first initial strain component to the adjusting structure 15, and the adjusting structure 15 is used to amplify the first initial strain component and the second initial strain component together into a target strain, and transfer the target strain to the fiber grating 102.

[0042] It should be noted that the fixed structure part and the first connecting structure part are both composed of multiple structural parts. When the object to be measured is in a working state, the strain is transmitted between the various structural parts, and finally the strain is measured by the fiber Bragg grating after the strain is amplified. Among them, the fiber Bragg grating lever structure can be specifically an integrated structure, and the first fixed structure part, the supporting structure part, the lever structure part, the adjustment structure part and the second structure part are connected in sequence. It can be understood that the object to be measured is disturbed by external factors in the working state, and the surface of the object to be measured will be deformed in the horizontal direction. The various structural parts are respectively subjected to tension, compression and bending. Therefore, the lever structure can be regarded as an over-determined structure, and then the deformation of the object to be measured can be amplified through the lever amplification theory, so that the fiber Bragg grating has the ability to monitor micro-strain. At the same time, the structural parts designed in the horizontal and vertical directions can facilitate the transmission of strain. Therefore, this fiber Bragg grating strain measurement system can further improve the sensitivity of strain monitoring, and at the same time, it can also improve the monitoring accuracy of strain monitoring.

[0043] In one embodiment, Figure 5 As shown, Figure 5 The schematic diagram of the structure represents the first connection structure part, wherein the first connection structure part 1002 also includes a lever extension 16, and the lever extension 16 is located at the top of the lever structure part 14; one end of the lever extension 16 is connected to the lever structure part 17, and the other end of the lever extension 16 is suspended; the lever extension 16 is used to provide prestress to the optical fiber Bragg grating 102.

[0044] It should be noted that after adding a lever extension to the first connecting structure part, it is convenient to provide prestress to the fiber grating fixed between the fixed structure part and the first connecting structure part before the strain measurement begins, so that the fiber grating is in a preset tensioned state, so that the fiber grating can sensitively capture the strain changes during the strain measurement stage. It can be understood that the preparation material of the lever extension part can be the same as or different from the fixed structure part and the first connecting structure part. For example, in one feasible method, the fixed structure part and the first connecting structure part that constitute the fiber grating lever structure are both made of stainless steel material, and the fiber grating lever structure is a double-layer planar asymmetric lever structure, which can not only effectively improve the sensitivity of fiber grating strain sensing, but also meet the actual needs of strain detection of the object to be measured.

[0045] In one embodiment, referring to Figure 6, a fiber Bragg grating strain measurement method is provided. This embodiment takes the method applied to a fiber Bragg grating strain measurement system as an example. It can be understood that the fiber Bragg grating strain measurement system includes a fiber Bragg grating and a fiber Bragg grating lever structure. The fiber Bragg grating lever structure includes a fixed structure part and a first connecting structure part. The fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part. The fixed structure part is fixedly connected to the object to be measured, and the fixed structure part and the first connecting structure part are detachably connected. The fiber Bragg grating strain measurement system also includes a terminal, which is used to process and analyze the optical signal transmitted by the fiber Bragg grating strain measurement system to finally obtain a specific value of the strain. The terminal includes but is not limited to a personal computer, a laptop computer, a smart phone, a tablet computer, an Internet of Things device and a portable wearable device. The Internet of Things device can be a smart speaker, a smart TV, a smart air conditioner, a smart car device, a projection device, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. It is understandable that the method of this embodiment can also be applied to a server, and can also be applied to a system including a server and a terminal, and can be implemented through the interaction between the system and the fiber Bragg grating strain measurement system. In this embodiment, the method includes steps S10-S30, wherein:

[0046] Step S10: transmitting the initial strain corresponding to the object to be measured to the first connecting structure part through the fixing structure part.

[0047] It should be noted that the initial strain may specifically be the strain to which the object to be measured is subjected in a working state, and may be transmitted through contact between a computer device and the surface of the object to be measured. It is understandable that the strain is transmitted in the fiber Bragg grating strain measurement system in the form of a signal.

[0048] As an example, the initial strain of the object to be measured is obtained through the fixed structure.

[0049] As another example, a first initial strain component exerted on the object to be measured is obtained through a first fixed structural member, and a second initial strain component exerted on the object to be measured is obtained through a second fixed structural member, and the first initial strain component and the second initial strain component are superimposed through the superposition principle to obtain the initial strain exerted on the object to be measured, and the initial strain is transmitted to the first connecting structure.

[0050] S20, amplifying the initial strain to a target strain through the first connecting structure.

[0051] It should be noted that the fiber Bragg grating packaging structure of the fiber Bragg grating strain measurement system can realize the function of strain amplification through the lever structure, eliminating the support reaction force and bending moment under the action of micro-deformation, and simplifying it to a secondary hyperstatic structure. At this time, the strain on the fiber Bragg grating can be finally calculated by analyzing the stress on the light grating lever, and finally the strain can be measured by the fiber Bragg grating.

[0052] As an example, the initial strain transmitted by the fixed structure part is received by the first connecting structure part of the fiber Bragg grating lever structure, and the initial strain is amplified to the target strain by the first connecting structure part of the fiber Bragg grating lever structure.

[0053] As another example, a first initial strain component transmitted by a first fixed structure is received through the first connecting structure portion of a fiber grating lever structure, and a second initial strain component of a second fixed structure is received through the first connecting structure portion of a fiber grating structure, the first initial strain component and the second initial strain component are integrated through the first connecting structure portion of the fiber grating structure to obtain the initial strain received by the object to be measured, and the initial strain is amplified to a target strain through the first connecting structure portion.

[0054] As another example, a first initial strain component transmitted by a first fixed structure is received through a supporting structure of the first connecting structure part, a second initial strain component of a second fixed structure is received through an adjusting structure of the first connecting structure part, an adjusting structure of the first connecting structure part is provided to receive the first initial strain component transmitted by the supporting structure part, the first initial strain component and the second initial strain component are jointly amplified into a target strain through the adjusting structure, and the target strain is transmitted to the fiber grating through the adjusting structure.

[0055] S30, measuring the target strain through the fiber Bragg grating.

[0056] As an example, the target strain is measured by fiber Bragg grating.

[0057] In this embodiment, a fixed structure portion fixed to the object to be measured receives the initial strain transmitted by the object to be measured, and transmits the initial strain to the first connection structure portion through the fixed structure portion, and the first connection structure portion amplifies the initial strain into a target strain, and finally the target strain is measured by the fiber grating fixed between the fixed structure portion and the first connection structure portion. Since the fixed structure portion can transmit the initial strain corresponding to the object to be measured, and the first connection structure portion and the fixed structure portion are detachably connected, that is, the structural relationship between the fixed structure portion and the first connection structure portion is adjustable, and since the first connection structure portion can amplify the initial strain into a target strain, the first connection structure portion can be changed by adjusting the structural relationship between the fixed structure portion and the first connection structure portion. The structure has the ability to amplify the initial strain, and finally the target strain can be measured through the fiber Bragg grating fixed between the fixed structure and the first connecting structure. Since the fiber Bragg grating lever structure of the fiber Bragg grating strain measurement system can amplify the initial strain corresponding to the object to be measured, the fiber Bragg grating can capture the strain change of the object to be measured through a target strain with a larger numerical value. Therefore, the technical defect that the strain measurement range of the fiber Bragg grating sensor is relatively fixed, which makes it difficult to capture the strain change of the transformer winding under micro-strain due to the large difference in the working state of the transformer winding under micro-strain and makes it easy to detect the strain of the transformer winding incorrectly due to the large difference in the working state of the transformer winding under micro-strain is overcome. Therefore, the detection sensitivity of the fiber Bragg grating sensor is improved.

[0058] In one embodiment, amplifying the initial strain to the target strain by the first connecting structure part includes:

[0059] Obtain a virtual displacement of the fiber Bragg grating lever structure under an initial strain; determine a first unit force and a second unit force of the fiber Bragg grating under an initial strain according to the virtual displacement, wherein the directions of the first unit force and the second unit force are opposite; and amplify the initial strain to a target strain through a first connecting structure according to a correspondence between the first unit force, the second unit force and a preset strain.

[0060] It should be noted that when the structure of the fiber Bragg grating strain measurement system is complex, the transmission of strain between the levers is complex, and the deformation coordination condition and the superposition principle need to be combined to realize the amplification of the initial strain. Considering the axial stiffness characteristics of the fiber Bragg grating, which can only be stretched and compressed, the fiber Bragg grating lever structure can be simplified to a rope structure. For example, in one feasible method, refer to Figure 7 , Figure 7This is a schematic diagram showing strain amplification by a fiber Bragg grating lever structure. Assuming that the object to be measured is a transformer winding, the fiber Bragg grating sensor composed of the fiber Bragg grating lever structure and the fiber Bragg grating is a fiber Bragg grating strain sensor. After the fiber Bragg grating lever structure is fixed to the surface of the transformer winding, as the working state of the winding is disturbed by external factors, when strain is generated on the winding surface, position a will produce horizontal deformation , by simplifying the fiber Bragg grating packaging structure into a pure lever structure, since each rod is subjected to tension, compression and bending respectively, the lever structure is regarded as an indeterminate structure. Since the support reaction force and bending moment can be omitted under the action of micro deformation, it is simplified to a secondary indeterminate structure. In the stress relationship obtained after removing the relevant constraints, the horizontal force X1 at position a and the horizontal force X2 at position b are as follows: Figure 7 As shown in the figure, it represents that the left and right sides of the fiber Bragg grating packaging structure are subjected to horizontal forces X1 and X2, respectively. Then, the lever is analyzed using the superposition principle. The deformation caused by X1 and X2 acting on the lever structure separately is analyzed. The deformation coordination condition and superposition distance are used to analyze the deformation of the structure. Analyze the relationship between X1 and X2. Assume X1 is the first unit force and X2 is the second unit force. When the first unit force acts on the sensitivity enhancement structure alone, the deformation at the left position a and the right position b of the fiber Bragg grating is and When the second unit force acts on the fiber Bragg grating lever structure alone, the deformations at the left position a and the right position b of the fiber Bragg grating are and , from which we can get the following expression:

[0061] [ δ 11 δ 12 δ 21 δ 22 ] [ X 1 X 2 ] = [ Δ l 0 ]

[0062] in, is the first virtual displacement of one side when the first unit force acts on the fiber Bragg grating lever structure alone, is the second virtual displacement of the other side when the first unit force acts on the fiber Bragg grating lever structure alone, is the third virtual displacement of one side when the second unit force acts on the fiber Bragg grating lever structure alone, is the fourth virtual displacement of the other side when the second unit force acts on the fiber Bragg grating lever structure alone, X1 is the first unit force, X2 is the second unit force, is the horizontal deformation of the fiber Bragg grating lever structure. According to the principle of material mechanics, each rod of the fiber Bragg grating lever structure is only subjected to tension, compression and bending. Therefore, the sensing structure can be regarded as a statically determinate structure. Through the deformation coordination principle and superposition principle, the virtual displacement of the fiber Bragg grating structure under the initial strain is calculated using the Mohr integral. Then, the first unit force and the second unit force of the fiber Bragg grating under the initial strain are calculated using each virtual displacement as a known quantity. Finally, the fiber Bragg grating deformation is calculated using the following expression:

[0063]

[0064]

[0065] in, is X1 or X2, X1 is the first unit force, X2 is the second unit force, is the initial strain, is the elastic modulus of the fiber Bragg grating, is the cross-sectional area of ​​the fiber Bragg grating, and finally the relationship between the strain on the fiber Bragg grating and the strain on the fiber Bragg grating lever structure is obtained. , and finally through Characterize the target strain.

[0066] As an example, the virtual displacement of the fiber Bragg grating structure under the initial strain is calculated using Mohr's integral to obtain a first virtual displacement on one side when the first unit force acts alone on the fiber Bragg grating lever structure, a second virtual displacement on the other side when the first unit force acts alone on the fiber Bragg grating lever structure, a third virtual displacement on one side when the second unit force acts alone on the fiber Bragg grating lever structure, and a fourth virtual displacement on the other side when the second unit force acts alone on the fiber Bragg grating lever structure; the first unit force and the second unit force of the fiber Bragg grating under the initial strain are determined according to the first virtual displacement, the second virtual displacement, the third virtual displacement and the fourth virtual displacement; the corresponding relationship between the first unit force, the second unit force and the preset strain is input into a preset expression, and the target strain after the initial strain is amplified is obtained through the first connecting structure.

[0067] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0068] Based on the same inventive concept, the embodiment of the present application also provides a computer device for implementing the above-mentioned fiber grating packaging method. The computer device can be a terminal, and its internal structure diagram can be as shown in Figure 8 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a fiber grating packaging method is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0069] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0070] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0071] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0072] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0073] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0074] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0075] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A fiber Bragg grating strain measurement system, characterized in that: The fiber Bragg grating strain measurement system comprises a fiber Bragg grating and a fiber Bragg grating lever structure, wherein the fiber Bragg grating lever structure comprises a fixed structure part and a first connecting structure part; The fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part, the fixed structure part is fixedly connected to the object to be measured, and the fixed structure part and the first connecting structure part are detachably connected; The fixed structure part is used to transfer the initial strain corresponding to the object to be measured to the first connection structure part, the first connection structure part is used to amplify the initial strain into a target strain, and the fiber Bragg grating is used to measure the target strain.

2. The system according to claim 1, characterized in that The system further comprises a second connecting structure, the fiber Bragg grating lever structure comprises a first lever structure and a second lever structure, the first lever structure is nested in the second lever structure; The second connecting structure is fixedly connected to the first lever structure and the second lever structure respectively; The second connecting structure is used to connect the first lever structure and the second lever structure, the first lever structure is used to amplify the initial strain to the target strain, and the second lever structure is used to protect the first lever structure.

3. The system according to claim 2, characterized in that The first lever structure is made of a rigid material having an elastic modulus greater than a preset elastic modulus threshold, and the second lever structure is made of a flexible material having a corrosion rate less than a preset corrosion rate threshold. The first lever structure and the second lever structure are mechanically fixedly connected via the second connecting structure portion.

4. The system according to claim 3, characterized in that The system further comprises a fiber protection sleeve, which is sleeved on the optical fiber tails at both ends of the optical fiber grating, and the optical fiber grating is fixed between the fixing structure part and the first connecting structure part by means of a polymer material.

5. The system according to claim 1, characterized in that The fixed connection method between the fixed structure part and the object to be measured includes one of the following: The fixed structure part is fixed to the object to be measured by means of a sticky matrix material; The fixed structure part is welded to the object to be tested; The fixing structure is mechanically fixedly connected to the object to be measured.

6. The system according to claim 1, characterized in that The fixed structure part includes a first fixed structure part and a second fixed structure part, the first connection structure part includes a support structure part, a lever structure part and an adjustment structure part, the lever structure part includes a first connection surface and a second connection surface, and the initial strain includes a first initial strain component and a second initial strain component; One end of the support structure is vertically connected to the first fixed structure, the other end of the support structure is vertically connected to the lever structure via the first connection surface, one end of the adjustment structure is vertically connected to the lever structure via the second connection surface, the other end of the adjustment structure is vertically connected to the second fixed structure, and the first fixed structure and the second fixed structure are both fixed to the object to be measured; Wherein, the first fixed structure is used to transfer the first initial strain component to the supporting structure, and the second fixed structure is used to transfer the second initial strain component to the adjusting structure; the supporting structure is used to transfer the first initial strain component to the adjusting structure, and the adjusting structure is used to amplify the first initial strain component and the second initial strain component together into the target strain, and transfer the target strain to the fiber Bragg grating.

7. The system according to claim 6, characterized in that The first connecting structure also includes a lever extension, which is located on the top of the lever structure; one end of the lever extension is connected to the lever structure, and the other end of the lever extension is suspended; the lever extension is used to provide prestress to the fiber grating.

8. A fiber Bragg grating strain measurement method, characterized in that: The fiber Bragg grating strain measurement method is applied to a fiber Bragg grating strain measurement system, wherein the fiber Bragg grating strain measurement system comprises a fiber Bragg grating and a fiber Bragg grating lever structure, wherein the fiber Bragg grating lever structure comprises a fixed structure part and a first connecting structure part, wherein the fiber Bragg grating is fixed between the fixed structure part and the first connecting structure part, wherein the fixed structure part is fixedly connected to an object to be measured, and wherein the fixed structure part and the first connecting structure part are detachably connected, wherein the method comprises: transmitting the initial strain corresponding to the object to be measured to the first connecting structure part through the fixing structure part; amplifying the initial strain to a target strain through the first connecting structure; The target strain is measured by the fiber Bragg grating.

9. The method according to claim 8, characterized in that The step of amplifying the initial strain to a target strain by the first connecting structure comprises: Acquiring a virtual displacement of the fiber grating lever structure under the initial strain; Determine a first unit force and a second unit force of the fiber Bragg grating under the initial strain according to the virtual displacement, wherein the first unit force and the second unit force are in opposite directions; According to the corresponding relationship between the first unit force, the second unit force and the preset strain, the initial strain is amplified to a target strain through the first connecting structure.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to claims 8 to 9 are implemented.

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