Packaging structure of fiber grating sensor and use method of packaging structure

Abstract

The invention discloses a packaging structure of a fiber bragg grating sensor and a use method thereof, the packaging structure comprises a fixed table, a constant temperature heating table, a pre-tensioning device, a fiber bragg grating and a lifting device, and further comprises a tool plate, and one end of the tool plate is installed on the sensing fixed table through a fastener; the pair of positioning grooves are respectively formed in the tool plate; the metal substrates are respectively arranged in the positioning grooves; wherein the fiber bragg grating is arranged on the pair of metal substrates; the optical fiber fixing point is arranged on the metal substrate; the quartz solder is placed in the optical fiber fixing point and used for welding the optical fiber grating on the optical fiber fixing point, and in daily use, through the arrangement of the tool plate and the metal substrate, the low-temperature quartz solder packaging technology can be applied to a tested piece which cannot directly package the optical fiber grating through the technology.

Description

Technical Field

[0001] The invention relates to a packaging structure. Background Art

[0002] Fiber Bragg sensor is a kind of fiber optic sensor. The sensing process based on fiber grating is to obtain sensing information by modulating the Bragg wavelength of the fiber by external physical parameters. It is a wavelength modulated fiber optic sensor. Fiber Bragg sensor can directly measure physical quantities such as temperature and strain.

[0003] The packaging structure has a great influence on the performance of fiber grating sensors. Fiber grating sensors packaged with low-temperature quartz solder have better sensing performance and longer service life. They are currently the most advanced packaging materials, but the application of this material has certain limitations. First, the material must be used in conjunction with a metal substrate to complete the packaging; second, the use of this material for packaging requires local heating, and the metal thickness at the fixed point cannot exceed 0.5mm, otherwise it is difficult to heat locally and reach the melting temperature; third, the strain sensor packaged with a metal substrate has high requirements for the flatness of the surface of the measured object, and it is difficult to use it for measurement on curved surfaces. Summary of the invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art.

[0005] The present application provides a packaging structure of a fiber grating sensor, including a fixing platform, a constant temperature heating platform, a pre-tensioning device, a fiber grating and a lifting device, and also includes:

[0006] A tooling plate, one end of which is mounted on the sensor fixing platform through a fastener;

[0007] A pair of positioning grooves, which are respectively arranged on the tooling plate;

[0008] A pair of metal substrates, which are respectively placed in the positioning grooves;

[0009] The fiber Bragg grating is installed on a pair of metal substrates.

[0010] Also includes:

[0011] An optical fiber fixing point, which is arranged on a metal substrate;

[0012] Quartz solder is placed in the optical fiber fixing point and is used to solder the optical fiber Bragg grating to the optical fiber fixing point.

[0013] Also includes:

[0014] A pair of spot welding installation positions, which are respectively arranged on the metal substrate and located on both sides of the optical fiber fixing point;

[0015] Wherein, a pair of spot welding installation positions and the optical fiber fixing point are located on the same straight line, and the straight line is perpendicular to the optical fiber.

[0016] The temperature of the constant temperature heating stage is set above 350°C.

[0017] Also includes:

[0018] A cooling box is installed on the lifting device and is located on one side of the constant temperature heating table;

[0019] An air pump, which is fixedly connected to one side of the cooling box through a gas pipeline;

[0020] A gas cooling pipe, which is fixedly installed in the inner cavity of the cooling box;

[0021] A vortex tube, which is fixedly connected between the gas cooling tube and the gas pump through a gas pipeline;

[0022] A spray head, which is fixedly connected to the upper end of the cooling box through a gas pipeline and fixedly connected to the upper end of the cooling box through a liquid pipeline;

[0023] The gas nozzle is arranged in the middle of the spray head.

[0024] Also includes:

[0025] A water pump, which is fixedly connected to the other side of the cooling box through a liquid pipeline;

[0026] A liquid cooling pipe, which is fixedly connected between the cooling box and the spray head;

[0027] The liquid nozzle is arranged on the spray head and is located around the gas nozzle.

[0028] Also includes:

[0029] A disassembly port, which is arranged at the lower end of the cooling box;

[0030] A disassembly assembly is mounted on a lifting device and is located below the cooling box;

[0031] Wherein, the cooling box is composed of a left box body and a right box body.

[0032] Disassembly components include:

[0033] A pair of support plates, which are respectively fixedly mounted on the lifting device;

[0034] A slide rail, which is arranged on a supporting plate at one side;

[0035] a slider, which is slidably mounted on the slide block;

[0036] A slide groove is arranged on the supporting plate on the other side;

[0037] A movable block, which is slidably mounted in the slide groove;

[0038] A connecting rod, which is fixedly connected between the slider and the movable block;

[0039] A pair of plug plates, which are rotatably mounted on the connecting rods;

[0040] Wherein, a pair of plug-in plates are combined and inserted into the cooling box through the disassembly and assembly opening.

[0041] Also includes:

[0042] A connecting block, which is fixedly connected to the middle part of the connecting rod;

[0043] A spring torsion bar is fixedly connected to the connecting block, and both ends are rotatably connected to the plug plates;

[0044] A pair of guide plates, which are respectively fixedly connected to the inner sides of the support plates;

[0045] A pair of locking blocks, which are respectively arranged on the inner walls of the left box body and the right box body;

[0046] A pair of guide grooves, which are respectively arranged on each locking block;

[0047] A positioning block, which is arranged on one side of the plug board;

[0048] The positioning block is arranged in a semicircular shape and is installed in the guide groove.

[0049] At the same time, a packaging structure and a method for using a fiber grating sensor are disclosed, including sensor packaging steps and sensor installation steps:

[0050] Sensor packaging steps:

[0051] S1. Metal base installation: install the metal base on the tooling plate, and then install one end of the tooling plate on the fixed platform;

[0052] S2, FBG installation: Place the FBG and quartz solder at the optical fiber fixing point;

[0053] S3, welding fixation: heating through a constant temperature heating table to melt the quartz solder, thereby welding the fiber Bragg grating on the metal substrate;

[0054] S4, disassembly: remove the packaged fiber grating sensor from the fixing table;

[0055] The sensor installation steps are:

[0056] E1. Fixing the pre-installed end: Weld one side of the metal substrate to the pre-installed position of the tested part;

[0057] E2. Pre-tension: Use a pre-tension device to pre-tension the fiber Bragg grating. The magnitude of the pre-tension is determined according to the measurement range of the strain sensor.

[0058] E3. Fixing of fixed end: After pre-tensioning is completed, weld the metal base on the other side to the fixed position of the test piece.

[0059] The beneficial effects of the present invention are as follows:

[0060] By setting up the tooling plate and the metal substrate, the low-temperature quartz solder packaging technology can be applied to the test piece that cannot directly package the optical fiber Bragg grating by this technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic diagram of a three-dimensional structure of a packaging structure of a fiber grating sensor and a method of using the same in an embodiment of the present application;

[0062] Figure 2 A front view of a packaging structure of a fiber grating sensor and a method of using the same in an embodiment of the present application;

[0063] Figure 3 A top view of a tooling plate in an embodiment of the present application;

[0064] Figure 4 is a top view of a metal substrate in an embodiment of the present application;

[0065] Figure 5 Schematic diagram of the installation position of the cooling box in the embodiment of the present application

[0066] Figure 6 A cross-sectional view of a cooling box in an embodiment of the present application;

[0067] Figure 7 This is a schematic diagram of the structure of the disassembly and assembly components in the embodiment of the present application;

[0068] Figure 8 A top view of the locking block in the embodiment of the present application;

[0069] Fig. 9 Based Figure 7 A schematic diagram of the enlarged local structure in the middle.

[0070] Reference numerals

[0071] 1-fixed table, 2-constant temperature heating table, 3-pre-tensioning device, 4-fiber Bragg grating, 5-lifting device, 6-tooling plate, 7-positioning groove, 8-metal substrate, 9-fiber fixing point, 10-quartz solder, 11-spot welding installation position, 12-cooling box, 1201-left box body, 1202-right box body, 13-air pump, 14-gas cooling pipe, 15-vortex tube, 16-spraying head, 17-gas nozzle, 18-water Pump, 19-liquid cooling pipe, 20-liquid nozzle, 21-disassembly and assembly port, 22-disassembly and assembly component, 23-support plate, 24-slide rail, 25-slider, 26-slide groove, 27-movable block, 28-plug plate, 29-connecting block, 30-spring torsion bar, 31-guide plate, 32-connecting rod, 33-hot air gun, 34-gas pipeline, 35-liquid pipeline, 36-locking block, 37-guide groove, 38-positioning block. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0073] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0074] In conjunction with the accompanying drawings, the packaging structure of a fiber grating sensor and the method of using the same provided by the embodiment of the present application are described in detail through specific embodiments and their application scenarios.

[0075] Embodiment 1:

[0076] like Figures 1 to 4 As shown, an embodiment of the present application provides a packaging structure of a fiber grating sensor, including a fixing platform 1, a constant temperature heating platform 2, a pre-tensioning device 3, a fiber grating 4 and a lifting device 5, and also includes: a tooling plate 6, which is installed on the sensor fixing platform 1 through fasteners; a pair of positioning grooves 7, which are respectively arranged on the tooling plate 6; a pair of metal substrates 8, which are respectively placed in each positioning groove 7; wherein the fiber grating 4 is installed on the pair of metal substrates 8.

[0077] Furthermore, it also includes an optical fiber fixing point 9, which is arranged on the metal substrate 8; and a quartz solder 10, which is placed in the optical fiber fixing point 9 and is used to weld the optical fiber Bragg grating 4 to the optical fiber fixing point 9.

[0078] Furthermore, it also includes a pair of spot welding installation positions 11, which are respectively arranged on the metal base 8 and located on both sides of the optical fiber fixing point 9; wherein the pair of spot welding installation positions 11 and the optical fiber fixing point 9 are located on the same straight line, and the straight line is perpendicular to the optical fiber.

[0079] Furthermore, the temperature of the constant temperature heating stage 2 is set above 350°C.

[0080] Furthermore, a packaging structure and a method for using a fiber grating sensor are disclosed, including a sensor packaging step and a sensor installation step:

[0081] Sensor packaging steps:

[0082] S1. Metal base installation: install the metal base 8 on the tooling plate 6, and then install one end of the tooling plate 6 on the fixing platform 1;

[0083] S2, fiber Bragg grating installation: placing the fiber Bragg grating 4 and the quartz solder 10 at the fiber fixing point 9;

[0084] S3, welding and fixing: heating by the constant temperature heating platform 2 to melt the quartz solder 10, thereby welding the fiber grating 4 to the metal substrate 8;

[0085] S4, disassembly: disassembling the packaged fiber Bragg grating sensor 4 from the fixing platform 1;

[0086] Sensor installation steps:

[0087] E1. Fixing the pre-installed end: welding the metal substrate 8 on one side to the pre-installed position of the tested part;

[0088] E2, pre-tensioning: using the pre-tensioning device 3 to pre-tension the fiber Bragg grating 4, the magnitude of the pre-tensioning is determined according to the measuring range of the strain sensor;

[0089] E3. Fixing the fixed end: After the pre-tensioning is completed, the metal base 8 on the other side is welded to the fixed position of the measured object.

[0090] In this embodiment of the present application, due to the use of the above-mentioned structure, when the fiber grating sensor 4 needs to be packaged, first, a pair of metal substrates 8 are placed in the positioning grooves 7 of the tooling plate 6 respectively, and then one end of the tooling plate 6 with the metal substrate 8 is installed on the fixing table 1 through fasteners (such as screws, bolts, etc.), and the fiber grating 4 is placed on the upper end surface of the metal substrate 8, and quartz solder 10 is placed in the optical fiber fixing point 9 of the metal base, and then the tooling plate 6 is heated by the constant temperature heating table 2. First, the height of the constant temperature heating platform 2 is changed by adjusting the lifting device 5. The lifting device 5 drives the constant temperature heating platform 2 to rise, so that the upper end surface of the constant temperature heating platform 2 is in contact with the lower end surface of the metal base 8 and the lifting device 5 stops rising. The constant temperature heating platform 2 is used for heating. The temperature needs to be heated to above 350°C, and the quartz solder 10 is heated until it melts and the surface is bright. If the solder is still not melted to the ideal state after the set temperature is heated to 400°C, a hot air gun 33 can be used to assist in heating the quartz solder 10. After heating to the ideal state, the lifting device 5 drives the constant temperature heating platform 2 to move down and reset. At the same time, the metal base 8 is separated from the constant temperature heating platform 2. During the cooling of the metal base 8, the quartz solder 10 is cooled at the same time, and the fiber grating 4 is fixed on the fiber fixing point 9, and then the jumper skin is installed outside the fiber grating 4. After the fiber grating 4 sensor packaging is completed, the tooling plate 6 can be removed from the fixing platform 1. (Note: The solder joints need to be polished, and the solder joints that are higher than the surface of the metal substrate 8 must be polished flat, otherwise the solder joints will break due to downward pressure when the sensor is installed).

[0091] Furthermore, when it is necessary to install the fiber grating 4 sensor, the device under test is installed on the fixed platform 1, and the metal base 8 on one side is first placed on the pre-installed position of the device under test. The two spot welding installation positions 11 of the metal base 8 are welded to the pre-installed position of the device under test using a spot welding device, and the center wavelength position of the fiber grating 4 is recorded. The optical fiber is pre-stretched using a pre-stretching device 3, and the specific pre-stretching data is set according to the measurement range requirements. For example: when the rated strain is ε=2000με, the strain sensitivity coefficient is approximately kε=1.2pm / με, so it is necessary to maintain a pre-stretching value of approximately Δλ=ε*kε=2.4nm for the fiber grating 4; after the pre-stretching is completed, the metal base 8 on the other side is welded to the fixed position of the device under test using a spot welding device, thereby completing the installation of the fiber grating 4 sensor.

[0092] Embodiment 2:

[0093] like Figure 5 , Figure 6As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, it also includes: a cooling box 12, which is installed on the lifting device 5 and is located on one side of the constant temperature heating table 2; an air pump 13, which is fixedly connected to one side of the cooling box 12 through a gas pipeline 34; a gas cooling pipe 14, which is fixedly installed in the inner cavity of the cooling box 12; a vortex tube 15, which is fixedly connected between the gas cooling pipe 14 and the air pump 13 through a gas pipeline 34; a spray head 16, which is fixedly connected to the upper end of the cooling box 12 through a gas pipeline 34 and fixedly connected to the upper end of the cooling box 12 through a liquid pipeline 35; a gas nozzle 17, which is arranged in the middle of the spray head 16.

[0094] Furthermore, it also includes a water pump 18, which is fixedly connected to the other side of the cooling box 12 through a liquid pipe 35; a liquid cooling pipe 19, which is fixedly connected between the cooling box 12 and the spray head 16; and a liquid nozzle 20, which is arranged on the spray head 16 and is located around the gas nozzle 17.

[0095] In this embodiment of the present application, due to the adoption of the above-mentioned structure, in order to speed up the cooling speed of the constant temperature heating platform 2, after the constant temperature heating platform 2 is heated, the lifting device 5 drives the constant temperature heating platform 2 to descend and reset. At this time, the gas generated by the start-up of the air pump 13 flows along the gas pipeline 34 and passes through the vortex tube 15 into the gas cooling tube 14. The vortex tube 15 cools the gas. The gas cooling tube 14 is arranged in the cooling box 12. The cooled gas enters the spray head 16 along the gas pipeline 34. The cooling gas is discharged from the gas nozzle 17. The cooling gas cools the surface of the heating constant temperature platform. At the same time, the water pump 18 is started to drive the liquid along the liquid cooling pipe 19 into the cooling box 12. Since the gas temperature in the gas cooling pipe 14 in the cooling box 12 is low, the liquid contacts the outer wall of the gas cooling pipe 14, thereby reducing the temperature of the liquid in the cooling box 12. The cooling liquid enters the spray head 16 through the liquid pipe 35, and the cooling liquid is sprayed out from each liquid nozzle 20, so that the cooling liquid also cools the constant temperature heating table 2, further improving the cooling speed of the constant temperature heating table 2, and avoiding burns caused by contact with the constant temperature heating table 2 when manually disassembling and assembling the fiber grating 4 sensor.

[0096] Embodiment 3:

[0097] like Figure 5 , Figure 7-9 As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, it also includes: a disassembly port 21, which is arranged at the lower end of the cooling box 12; a disassembly component 22, which is installed on the lifting device 5 and is located below the cooling box 12; wherein the cooling box 12 is composed of a left box body 1201 and a right box body 1202.

[0098] Furthermore, the disassembly and assembly component 22 includes a pair of support plates 23, which are respectively fixedly mounted on the lifting device 5; a slide rail 24, which is arranged on one side of the support plate 23; a slider 25, which is slidably mounted on the slider 25; a slide groove 26, which is arranged on the other side of the support plate 23; a movable block 27, which is slidably mounted in the slide groove 26; a connecting rod 32, which is fixedly connected between the slider 25 and the movable block 27; a pair of plug plates 28, which are respectively rotatably mounted on the connecting rod 32; wherein, the pair of plug plates 28 are combined and inserted into the cooling box 12 through the disassembly and assembly port 21.

[0099] Furthermore, it also includes a connecting block 29, which is fixedly connected to the middle part of the connecting rod 32; a spring torsion rod 30, which is fixedly connected to the connecting block 29, and the two ends are rotatably connected to the plug plates 28; a pair of guide plates 31, which are respectively fixedly connected to the inner sides of the support plates 23; a pair of locking blocks 36, which are respectively arranged on the inner walls of the left box body 1201 and the right box body 1202; a pair of guide grooves 37, which are respectively arranged on the locking blocks 36; a positioning block 38, which is arranged on one side of the plug plate 28; wherein the positioning block 38 is arranged in a semicircular shape and is installed in the guide groove 37.

[0100] In this embodiment of the present application, due to the use of the above-mentioned structure, impurities exist in the liquid, and the impurities will adhere to the inner wall of the cooling box 12. The cooling box 12 needs to be cleaned and the cooling box 12 needs to be disassembled. Generally, the gas cooling tube 14, liquid cooling tube 19, gas pipeline 34 and liquid pipeline 35 connected thereto need to be removed first, and the disassembly and assembly speed is slow. The cooling box 12 is configured to be divided into a left box body 1201 and a right box body 1202 which can be detached and assembled in two equal parts. When the left box body 1201 and the right box body 1202 need to be disassembled, a screw rod is rotatably installed in the slide groove 26, and the screw rod is electrically driven to rotate and drive the movable block 27 to move in the slide groove 26. When the electrically driven screw rod drives the movable block 27 to move upward along the slide groove, the movable block 27 drives the connecting rod 32 to move together. At the same time, the slider 25 at the other end of the connecting rod 32 moves upward along the slide rail 24, and the connecting rod 32 drives a pair of plug plates 28 on the connecting block 29 to move upward together. The slide groove 26 is set to a certain distance to limit the sliding distance of the movable block 27. Positioning blocks 38 are provided on both sides of each plug plate 28 close to the fitting surface. In the process of a pair of plug plates 28 merging and moving upward, the positioning blocks 38 on both sides of the left and right plug plates 28 8 is merged into a full circle. In the process of the insertion block driving the positioning block 38 to move upward, the positioning block 38 pushes the locking block 36 to move, and the positioning block 38 moves out along the guide groove 37, so that the locking blocks 36 on both sides respectively drive the left box body 1201 and the right box body 1202 to move to both ends, and there is a small gap between the left box body 1201 and the right box body 1202. At this time, the positioning block 38 disengages from the guide groove 37 of the locking block 36, and the slider 25 continues to drive the plug plate 28 to move upward. When the lower end of each plug plate 28 contacts each guide plate 31, a pair of plug plates 28 rotate to both sides with the spring torsion bar 30 as the center of the circle. While the plug plates 28 on both sides rotate, they push the disassembly and assembly opening 21 outward to separate, so that the gap between the left box body 1201 and the right box body 1202 becomes larger, which is convenient for cleaning the inner walls of the left box body 1201 and the right box body 1202.When the left box body 1201 and the right box body 1202 need to be combined, the upper opening center of the guide groove 37 of the left box body 1201 and the right box body 1202 is moved to the same vertical straight line position as the center of the spring torsion bar 30, and the electric drive screw drives the movable block 27 to slide downward along the slide groove 26, and the movable block 27 drives the connecting rod 32, the connecting block 29 and the plug plate 29 to move downward together. At the same time, the slider 25 moves downward along the slide rail 24. At this time, the plug plate 28 is separated from the guide plate 31, and the spring torsion bar 30 drives each plug plate 28 to rotate inward. , so that a pair of plug plates 28 are merged, and the positioning blocks 38 are merged into a full circle. The plug plates 28 continue to move downward, and the positioning blocks 38 move along the guide grooves 37, while driving the locking blocks 36 on both sides to move inward. When they move to the bottom of the guide grooves, the left box body 1201 and the right box body 1202 are merged, and when the slider 25 is not started, the positioning blocks 38 are always at the bottom of the guide grooves 37 to prevent the left box body 1201 from separating from the right box body 1202, effectively improving the disassembly and assembly speed of the cooling box 12, and realizing automatic disassembly and assembly of the cooling box 12, which is more convenient.

[0101] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0102] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A packaging structure of a fiber Bragg grating sensor, comprising a fixing platform (1), a constant temperature heating platform (2), a pre-tensioning device (3), a fiber Bragg grating (4) and a lifting device (5), characterized in that: Also includes: A tooling plate (6), one end of which is mounted on the fixing platform (1) via a fastener; A pair of positioning grooves (7) respectively arranged on the tooling plate (6); A pair of metal substrates (8) respectively placed in the positioning grooves (7); Wherein, the optical fiber grating (4) is installed on a pair of metal substrates (8).

2. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: Also includes: An optical fiber fixing point (9) arranged on the metal substrate (8); The quartz solder (10) is placed in the optical fiber fixing point (9) and is used to solder the optical fiber grating (4) to the optical fiber fixing point (9).

3. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: Also includes: A pair of spot welding installation positions (11), which are respectively arranged on the metal substrate (8) and located on both sides of the optical fiber fixing point (9); Wherein, a pair of the spot welding installation positions (11) and the optical fiber fixing point (9) are located on the same straight line, and the straight line is perpendicular to the optical fiber.

4. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: The temperature of the constant temperature heating platform (2) is set above 350°C.

5. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: Also includes: A cooling box (12) is installed on the lifting device (5) and is located on one side of the constant temperature heating platform (2); An air pump (13) fixedly connected to one side of the cooling box (12) via a gas pipeline; A gas cooling pipe (14) fixedly installed in the inner cavity of the cooling box (12); A vortex tube (15) fixedly connected between the gas cooling tube (14) and the air pump (13) via a gas pipeline; A spray head (16) fixedly connected to the upper end of the cooling box (12) via a gas pipeline and fixedly connected to the upper end of the cooling box (12) via a liquid pipeline; A gas nozzle (17) is arranged in the middle of the spray head (16).

6. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: Also includes: a water pump (18) fixedly connected to the other side of the cooling box (12) via a liquid pipeline; A liquid cooling pipe (19) fixedly connected between the cooling box (12) and the spray head (16); The liquid nozzle (20) is arranged on the spray head (16) and is located around the gas nozzle (17).

7. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: Also includes: A disassembly opening (21) provided at the lower end of the cooling box (12); A disassembly assembly (22) mounted on the lifting device (5) and located below the cooling box (12); Wherein, the cooling box (12) consists of a left box body (1201) and a right box body (1202).

8. The packaging structure of a fiber Bragg grating sensor according to claim 1, characterized in that: The disassembly assembly (22) comprises: A pair of support plates (23) respectively fixedly mounted on the lifting device (5); A slide rail (24) disposed on one side of the support plate (23); a slider (25) slidably mounted on the slider (25); A slide groove (26) arranged on the support plate (23) on the other side; A movable block (27) slidably mounted in the slide groove (26); A connecting rod (32) fixedly connected between the sliding block (25) and the movable block (27); A pair of plug plates (28) which are rotatably mounted on the connecting rods (32); Wherein, a pair of the insert plates (28) are combined and inserted into the cooling box (12) through the disassembly and assembly opening (21).

9. The packaging structure of a fiber grating sensor according to claim 1, characterized in that: Also includes: A connecting block (29) fixedly connected to the middle portion of the connecting rod (32); A spring torsion rod (30) is fixedly connected to the connection block (29), and the two ends are rotatably connected to the plug plates (28); A pair of guide plates (31) respectively fixedly connected to the inner side of each of the support plates (23); A pair of locking blocks (36) respectively arranged on the inner walls of the left box body (1201) and the right box body (1202); A pair of guide grooves (37) respectively arranged on each of the locking blocks (36); A positioning block (38) disposed on one side of the plug board (28); The positioning block (38) is arranged in a semicircular shape and is installed in the guide groove (37).

10. A packaging structure suitable for a fiber grating sensor according to claim 1 and a method of using the same, characterized in that: Including sensor packaging steps and sensor installation steps: The sensor packaging steps: S1. Metal base installation: install the metal base (8) on the tooling plate (6), and then install one end of the tooling plate (6) on the fixing platform (1); S2, fiber Bragg grating installation: placing the fiber Bragg grating (4) and the quartz solder (10) at the fiber fixing point (9); S3, welding and fixing: heating by a constant temperature heating platform (2) to melt the quartz solder (10), thereby welding the fiber grating (4) to the metal substrate (8); S4, disassembly: disassembling the packaged fiber Bragg grating (4) sensor from the fixing platform (1); The sensor installation steps are: E1. Fixing the pre-installed end: welding the metal substrate (8) on one side to the pre-installed position of the tested piece; E2, pre-tensioning: using a pre-tensioning device (3) to pre-tension the optical fiber Bragg grating (4), the magnitude of the pre-tensioning being determined according to the measuring range of the strain sensor; E3. Fixing the fixed end: After the pre-tensioning is completed, the other side metal base (8) is welded to the fixed position of the test piece.

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