Protective structure for fiber bragg grating sensing system

Abstract

The utility model discloses a protection structure for a fiber bragg grating sensing system, which comprises a protection shell and a sensor arranged in the protection shell. The supporting mechanism is used for providing adjustable support for the sensor, the jacking mechanism is used for carrying out fixed-point protection on the substrate type sensor, the protection mechanism is used for carrying out fixed-point protection on the linear type sensor, and the supporting mechanism is arranged at the bottom of the sensor. The beneficial effects of the utility model are that the structure is simple, the support mechanism is arranged, adjustable support can be provided for sensors of different types and specifications, the use is flexible, and the cost is low. The jacking mechanism is arranged to be matched with the protection mechanism, fixed-point protection can be carried out on the sensor, the device is suitable for sensor structures of various specifications and shapes, and the protection effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber grating sensing systems, in particular to a protective structure for optical fiber grating sensing systems. Background Art

[0002] In the prior art, fiber grating sensors are sensors that convert the state of the measured object into a measurable optical signal. Fiber grating sensing systems are auxiliary devices that use sensors to monitor changes in device loads, and are widely used in the field of electrical components. Fiber gratings have the advantages of being small and light, resistant to electromagnetic interference, and corrosion, and have strong networking capabilities, making them suitable for use in harsh environments. Fiber gratings can be used to monitor bending moments, torsional deformations, vibrations, impact loads, etc. at key parts of the device, and these monitoring data can be used to establish a load model database, providing a reliable theoretical basis for device safety and reliability assessment and structural response analysis. Since the working environment of fiber grating strain sensors is very complex and harsh, however, ordinary fiber grating strain sensors have a relatively fragile structure due to their own characteristics, and are easily damaged when exposed to frequent external forces, resulting in inaccurate measurement data of the fiber grating sensing system, which has a serious impact on the entire device monitoring system and affects the user's judgment of the device status.

[0003] The Chinese utility model patent with application number: 202221311728.2 discloses an internally fixed fiber grating protection device, including a protection shell, a fiber grating inlet and a fiber grating outlet are provided on the protection shell, a protection beam is provided in the protection shell, the protection beam is an annular beam suitable for enclosing the sensor in the fiber grating and a fiber grating entry hole and a fiber grating exit hole are provided on the beam; the protection beam is an elastic beam body; the fiber grating entry hole and the fiber grating exit hole are relatively arranged on the two corners of the diamond beam; the fiber grating inlet, the fiber grating outlet, the fiber grating entry hole and the fiber grating exit hole are coaxially arranged; a spring sleeve is coaxially connected at the fiber grating inlet; an armored tube is provided at the fiber grating outlet; the protection beam is detachably installed in the protection shell; the protection shell includes a bottom plate and a cover plate, the protection beam is installed on the bottom plate, and the cover plate is detachably covered on the bottom plate. However, this type of internally fixed fiber grating protection device provides full-surrounding fixed protection for the fiber grating, and can only protect a single type of fiber grating, but cannot protect substrate-type fiber optic sensors. That is, it cannot be applied to fiber grating structures of different specifications and shapes, and its usage is relatively single and has certain usage restrictions. Utility Model Content

[0004] The utility model aims to provide a protective structure for a fiber grating sensing system.

[0005] In order to achieve the above purpose, the technical solution proposed by the utility model is:

[0006] A protective structure for a fiber grating sensing system includes a protective shell and a sensor, wherein the sensor is arranged inside the protective shell, and further includes a supporting mechanism for providing adjustable support for the sensor, a holding mechanism for performing fixed-point protection on a substrate-type sensor, and a protective mechanism for performing fixed-point protection on a linear sensor. The supporting mechanism is arranged at the bottom of the sensor, the holding mechanism is configured at the middle position of the upper end of the inner part of the protective shell corresponding to the substrate-type sensor, and the protective mechanism is arranged at the upper inner part of the protective shell corresponding to the linear sensor.

[0007] The supporting mechanism includes a supporting upright, a supporting core rod, a positioning screw and a supporting base plate, wherein the supporting uprights are provided with two groups, and the two groups of supporting uprights are vertically arranged at the lower inner part of the protective shell and the interior of the supporting uprights is a hollow structure, the supporting core rods are provided with two groups, and the two groups of supporting core rods are respectively arranged at the upper inner parts of the two groups of supporting uprights and their lower parts are plugged with the supporting uprights, and the upper ends of the supporting core rods protrude from the supporting uprights, and the positioning screws are provided with two groups, and the two groups of positioning screws are respectively arranged at the upper end sides of the two groups of supporting uprights and penetrate the supporting uprights and are threadedly connected to the corresponding supporting uprights, and the positioning screws are in contact with the supporting core rods, and the supporting base plate is arranged at the upper ends of the two groups of supporting core rods and is fixedly connected to the two groups of supporting core rods, and the sensor is located at the upper end of the supporting base plate.

[0008] It also includes a substrate card slot and a linear card slot, wherein the substrate card slot is arranged in the middle of the upper end of the supporting substrate and the substrate card slot corresponds to the substrate sensor and is arranged as a rectangular slot structure, and the linear card slot is provided with two groups, the two groups of linear card slots are symmetrically arranged on both sides of the upper end of the supporting substrate and the linear card slots correspond to the linear card slots and are arranged as a strip linear structure, and the sensor is configured at the upper end of the supporting substrate through the substrate card slot or the linear card slot.

[0009] The supporting mechanism includes a supporting base block, a supporting core block and a supporting spring. The supporting base block is arranged at the upper end of the inner part of the protective shell corresponding to the substrate slot and is fixedly connected to the protective shell. The interior of the supporting base block is set as a hollow structure. The supporting core block is arranged inside the supporting base block and is embedded in the supporting base block. The lower part of the supporting core block protrudes from the bottom of the supporting base block and abuts against the substrate sensor. The supporting spring is arranged inside the supporting base block and its two ends abut against the supporting base block and the supporting core block respectively.

[0010] It also includes a supporting protection pad, which is arranged at the bottom of the supporting core block and fixedly connected to the supporting core block. The supporting core block abuts against the substrate sensor through the supporting protection pad.

[0011] The protection mechanism includes a protection support rod, a protection spring and a protection top block, the protection support rod is provided with two groups, the two groups of protection support rods are symmetrically arranged at the inner upper end of the protection shell and fixedly connected to the protection shell, the protection support rod is vertically arranged, the protection spring is provided with two groups, the two groups of protection springs are symmetrically arranged at the inner upper end of the protection shell corresponding to the two groups of protection support rods and their upper ends are fixedly connected to the protection shell, the two groups of protection springs are respectively sleeved on the outer sides of the two groups of protection support rods, the protection top block is provided with two groups, the two groups of protection top blocks are respectively arranged at the lower ends of the two groups of protection springs and fixedly connected to the corresponding protection springs, the upper inner side of the protection top block is provided with a receiving groove, the lower part of the protection support rod is located in the receiving groove and a distance is left between the side wall of the receiving groove, and the bottom of the protection top block abuts against the linear sensor.

[0012] There are two groups of protection mechanisms, and the two groups of protection mechanisms are symmetrically arranged at the inner upper end of the protection shell corresponding to the two groups of linear slots.

[0013] It also includes a base, which is arranged at the bottom of the protective shell and fixedly connected to the protective shell by screws, the supporting pole is arranged at the upper end of the base and fixedly connected to the base, and a limiting protrusion is provided at the upper end of the base corresponding to the protective shell, and the limiting protrusion is located on the inner side of the lower part of the protective shell and is arranged to fit the inner wall of the protective shell.

[0014] It also includes a connecting head and an adapter, wherein the connecting head is arranged at one end of the upper part of the protective shell and is embedded in the protective shell, the connecting head passes through the protective shell, and the adapter is provided with two groups, the two groups of adapters are symmetrically arranged on both sides of one end of the protective shell away from the connecting head and are embedded in the protective shell, the adapter passes through the protective shell, and the connecting head and the adapter are respectively connected to the two ends of the sensor.

[0015] It also includes a connecting terminal, which is arranged between the sensor and the connecting head and the adapter. The connecting head and the adapter are connected to the end of the sensor through the connecting terminal.

[0016] The beneficial effects of the utility model are:

[0017] The structure is simple and equipped with a supporting mechanism, which can provide adjustable support for sensors of different types and specifications. It is flexible to use and is equipped with a supporting mechanism and a protective mechanism to respectively support and limit the substrate-type sensor and the linear sensor, thereby providing fixed-point protection for the sensor, effectively reducing the impact of vibration and external shock on the sensor, with good protective effect, and is suitable for sensor structures of various specifications and shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of the support mechanism of the utility model;

[0020] Figure 3 It is a schematic diagram of the cooperation between the supporting base plate, the substrate slot and the linear slot of the utility model;

[0021] Figure 4 This is a cross-sectional view of the top holding mechanism of the utility model;

[0022] Figure 5 It is a cross-sectional view of the protective mechanism of the utility model;

[0023] Figure 6 It is a schematic diagram of the cooperation between the connecting head and the adapter and the protective shell of the utility model.

[0024] In the figure: 1. Protective shell; 2. Sensor; 3. Support pole; 4. Support core rod; 5. Positioning screw; 6. Support base plate; 7. Substrate slot; 8. Linear slot; 9. Support base block; 10. Support core block; 11. Support spring; 12. Support protection pad; 13. Protection support rod; 14. Protection spring; 15. Protection top block; 16. Base; 17. Connection head; 18. Adapter; 19. Connection terminal. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0026] A protective structure for a fiber grating sensor system includes a protective shell 1 and a sensor 2, wherein the sensor 2 is arranged inside the protective shell 1, and further includes a support mechanism for providing adjustable support for the sensor 2, a top holding mechanism for performing fixed-point protection on the substrate-type sensor, and a protective mechanism for performing fixed-point protection on the linear sensor. The support mechanism is arranged at the bottom of the sensor 2, the top holding mechanism is arranged at the middle position of the upper end of the inner part of the protective shell 1 corresponding to the substrate-type sensor, and the protective mechanism is arranged at the inner upper part of the protective shell 1 corresponding to the linear sensor. The overall structural schematic diagram of the utility model is shown as follows Figure 1 shown.

[0027] The supporting mechanism comprises supporting uprights 3, supporting core rods 4, positioning screws 5 and supporting base plate 6. The supporting uprights 3 are provided with two groups, and the two groups of supporting uprights 3 are vertically arranged at the lower inner part of the protective shell 1 and the interior of the supporting uprights 3 is a hollow structure. The supporting core rods 4 are provided with two groups, and the two groups of supporting core rods 4 are respectively arranged at the upper inner parts of the two groups of supporting uprights 3 and their lower parts are plugged with the supporting uprights 3, and the upper ends of the supporting core rods 4 protrude from the supporting uprights 3. The positioning screws 5 are provided with two groups, and the two groups of positioning screws 5 are respectively arranged at the upper end sides of the two groups of supporting uprights 3 and penetrate the supporting uprights 3 and are threadedly connected with the corresponding supporting uprights 3. The positioning screws 5 abut against the supporting core rods 4. The supporting base plate 6 is arranged at the upper ends of the two groups of supporting core rods 4 and is fixedly connected with the two groups of supporting core rods 4. The sensor 2 is located at the upper end of the supporting base plate 6. The supporting mechanism cooperates with the supporting uprights 3, the supporting core rods 4, the positioning screws 5 and the supporting base plate 6 , providing support for the sensor 2, wherein the support upright 3 is used to provide installation support for the support core rod 4, the support core rod 4 is used to form an adjustable support rod structure together with the support upright 3, the positioning screw 5 is used to relatively position the support core rod 4 and the support upright 3 to achieve the fixation of the support rod length, and the support base plate 6 is used to provide support for the sensor 2, and the height of the support mechanism can be adjusted according to the installation requirements of the sensor 2. When the height of the support mechanism needs to be adjusted, the positioning screw 5 is rotated to make it break away from the contact with the support core rod 4, and then the extended length of the support core rod 4 relative to the support upright 3 is adjusted, so as to adjust the height of the support rod. After the adjustment is completed, the positioning screw 5 is rotated to make it abut against the support core rod 4, so that the length of the support core rod 4 relative to the support upright 3 can be fixed, thereby completing the adjustment of the height of the support mechanism. The cross-sectional view of the support mechanism of the utility model is shown in Figure 2 shown.

[0028] It also includes a substrate card slot 7 and a linear card slot 8. The substrate card slot 7 is arranged in the middle of the upper end of the supporting substrate 6, and the substrate card slot 7 is arranged as a rectangular slot structure corresponding to the substrate type sensor. There are two groups of linear card slots 8, and the two groups of linear card slots 8 are symmetrically arranged on both sides of the upper end of the supporting substrate 6, and the linear card slots 8 are arranged as a strip linear structure corresponding to the linear card slots. The sensor 2 is configured on the upper end of the supporting substrate 6 through the substrate card slot 7 or the linear card slot 8, wherein the substrate card slot 7 is used as a mounting structure on the supporting substrate 6, thereby providing mounting support for the substrate type sensor, and the linear card slot 8 is used as a mounting structure on the supporting substrate 6, thereby providing mounting support for the linear sensor. The schematic diagram of the cooperation between the supporting substrate 6 of the utility model and the substrate card slot 7 and the linear card slot 8 is shown in Figure 3 shown.

[0029] The supporting mechanism includes a supporting base block 9, a supporting core block 10 and a supporting spring 11. The supporting base block 9 is arranged at the upper end of the inner part of the protective shell 1 corresponding to the substrate card slot 7 and is fixedly connected to the protective shell 1. The interior of the supporting base block 9 is set as a hollow structure. The supporting core block 10 is arranged inside the supporting base block 9 and is embedded and connected with the supporting base block 9. The lower part of the supporting core block 10 protrudes from the bottom of the supporting base block 9 and abuts against the substrate sensor. The supporting spring 11 is arranged inside the supporting base block 9 and its two ends are respectively connected to the supporting base block 9. The base block 9 and the top holding core block 10 are abutted, and the top holding mechanism cooperates with the top holding base block 9, the top holding core block 10 and the top holding spring 11 to provide a top holding support for the substrate type sensor to protect it, wherein the top holding base block 9 is used to provide installation support for the top holding core block 10 and the top holding spring 11, the top holding core block 10 is used to provide a top holding support for the substrate type sensor under the action of the top holding spring 11, and the top holding spring 11 is used to provide elastic support for the top holding core block 10. The cross-sectional view of the top holding mechanism of the utility model is shown in Figure 4 shown.

[0030] It also includes a supporting protection pad 12, which is arranged at the bottom of the supporting core block 10 and fixedly connected to the supporting core block 10. The supporting core block 10 is abutted against the substrate type sensor through the supporting protection pad 12, wherein the supporting protection pad 12 is used as a protective structure at the bottom of the supporting core block 10, so as to support the substrate type sensor 2 under the action of the supporting core block 10 to protect it.

[0031] The protection mechanism includes a protection support rod 13, a protection spring 14 and a protection top block 15. The protection support rod 13 is provided with two groups, and the two groups of protection support rods 13 are symmetrically arranged at the inner upper end of the protection shell 1 and fixedly connected to the protection shell 1. The protection support rod 13 is vertically arranged. The protection spring 14 is provided with two groups, and the two groups of protection springs 14 are symmetrically arranged at the inner upper end of the protection shell 1 corresponding to the two groups of protection support rods 13, and their upper ends are fixedly connected to the protection shell 1. The two groups of protection springs 14 are respectively sleeved on the outer sides of the two groups of protection support rods 13. There are two groups of protection top blocks 15, and the two groups of protection top blocks 15 are respectively arranged at the lower ends of the two groups of protection springs 14 and fixedly connected to the corresponding protection springs 14. The upper inner side of the protection top block 15 is provided with a receiving groove, and the lower part of the protection support rod 13 is located at the receiving groove. The bottom of the protective top block 15 abuts against the linear sensor, and the protective mechanism cooperates with the protective support rod 13, the protective spring 14 and the protective top block 15 to provide a fixed-point top support for the linear sensor to protect the linear sensor, wherein the protective support rod 13 is used as a limiting structure on the protective mechanism, thereby limiting the protective spring 14 and the protective top block 15 and preventing the protective spring 14 and the protective top block 15 from getting stuck, the protective spring 14 is used to provide elastic support for the protective top block 15, and the protective top block 15 is used to provide a fixed-point top support for the linear sensor under the action of the protective spring 14 to protect the linear sensor. The cross-sectional view of the protective mechanism of the utility model is shown in Figure 5 shown.

[0032] There are two groups of protection mechanisms, which are symmetrically arranged at the inner upper end of the protective shell 1 corresponding to the two groups of linear slots 8. The two groups of protection mechanisms can simultaneously support and protect the two groups of optical fiber sensors.

[0033] It also includes a base 16, which is arranged at the bottom of the protective shell 1 and fixedly connected to the protective shell 1 by screws, and the supporting pole 3 is arranged at the upper end of the base 16 and fixedly connected to the base 16. A limiting protrusion is provided at the upper end of the base 16 corresponding to the protective shell 1, and the limiting protrusion is located on the inner side of the lower part of the protective shell 1 and is arranged to fit the inner wall of the protective shell 1, wherein the base 16 is used to form a closed shell structure together with the protective shell 1, thereby providing protection for the fiber optic Bragg grating sensing system.

[0034] It also includes a connection head 17 and an adapter 18, the connection head 17 is arranged at one end of the upper part of the protective shell 1 and is embedded and connected with the protective shell 1, the connection head 17 passes through the protective shell 1, and the adapter 18 is provided with two groups, the two groups of adapters 18 are symmetrically arranged on both sides of the end of the protective shell 1 away from the connection head 17 and are embedded and connected with the protective shell 1, the adapter 18 passes through the protective shell 1, the connection head 17 and the adapter 18 are respectively connected to the two ends of the sensor 2, wherein the connection head 17 and the adapter 18 are used as a connection structure on the fiber grating sensing system, and the connection head 17 and the adapter 18 of the utility model cooperate with the protective shell 1 as shown in the schematic diagram Figure 6 shown.

[0035] It also includes a connecting terminal 19, which is arranged between the sensor 2 and the connecting head 17 and the adapter 18. The connecting head 17 and the adapter 18 are connected to the end of the sensor 2 through the connecting terminal 19, wherein the connecting terminal 19 is used as a connecting structure between the connecting head 17 and the adapter 18 and the sensor 2.

[0036] Working principle:

[0037] When the sensor 2 needs to be protected and installed, the height of the supporting base plate 6 is adjusted through the supporting mechanism according to the installation requirements of the sensor 2, and the sensor 2 is installed in the substrate slot 7 or the linear slot 8 according to the type of sensor 2. The two ends of the sensor 2 are connected to the connecting head 17 and the adapter 18 through the connecting terminals 19. After the installation is completed, the supporting mechanism can support and limit the substrate type sensor to protect the substrate type sensor, and the protective mechanism can support and limit the linear sensor to protect the linear sensor.

[0038] The beneficial effects of the utility model are that it has a simple structure and is equipped with a supporting mechanism, which can provide adjustable support for sensors of different types and specifications, is flexible to use, and is equipped with a supporting mechanism and a protective mechanism to respectively support and limit the substrate-type sensor and the linear sensor, thereby providing fixed-point protection for the sensor, effectively reducing the impact of vibration and external impact on the sensor, having a good protective effect, and being suitable for sensor structures of various specifications and shapes.

[0039] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A protective structure for a fiber Bragg grating sensor system, comprising a protective shell (1) and a sensor (2), wherein the sensor (2) is arranged inside the protective shell (1), characterized in that: It also includes a support mechanism for providing adjustable support for the sensor (2), a supporting mechanism for providing fixed-point protection for the substrate-type sensor, and a protective mechanism for providing fixed-point protection for the linear sensor. The support mechanism is arranged at the bottom of the sensor (2), the supporting mechanism is arranged at the middle position of the upper end of the interior of the protective shell (1) corresponding to the substrate-type sensor, and the protective mechanism is arranged at the upper inner part of the protective shell (1) corresponding to the linear sensor.

2. A protective structure for a fiber Bragg grating sensing system as claimed in claim 1, characterized in that: The support mechanism comprises a support upright pole (3), a support core pole (4), a positioning screw (5) and a support base plate (6); the support upright pole (3) is provided with two groups, the two groups of the support upright poles (3) are vertically arranged at the lower inner part of the protective shell (1) and the interior of the support upright pole (3) is a hollow structure; the support core pole (4) is provided with two groups, the two groups of the support core poles (4) are respectively arranged at the upper inner part of the two groups of the support upright poles (3) and the lower parts thereof are plugged into the support upright poles (3); the upper end of the support core pole (4) protrudes For the support uprights (3), two groups of positioning screws (5) are provided. The two groups of positioning screws (5) are respectively arranged on the upper end sides of the two groups of support uprights (3) and penetrate the support uprights (3) and are threadedly connected to the corresponding support uprights (3). The positioning screws (5) abut against the support core rods (4). The support base plate (6) is arranged on the upper ends of the two groups of support core rods (4) and is fixedly connected to the two groups of support core rods (4). The sensor (2) is located at the upper end of the support base plate (6).

3. A protective structure for a fiber Bragg grating sensing system as claimed in claim 2, characterized in that: It also comprises a substrate card slot (7) and a linear card slot (8), wherein the substrate card slot (7) is arranged at the middle of the upper end of the supporting substrate (6) and the substrate card slot (7) is arranged as a rectangular slot structure corresponding to the substrate type sensor, and the linear card slot (8) is provided with two groups, the two groups of linear card slots (8) are symmetrically arranged on both sides of the upper end of the supporting substrate (6) and the linear card slots (8) are arranged as a strip line structure corresponding to the linear card slots, and the sensor (2) is arranged at the upper end of the supporting substrate (6) through the substrate card slot (7) or the linear card slot (8).

4. A protective structure for a fiber Bragg grating sensing system as claimed in claim 3, characterized in that: The supporting mechanism comprises a supporting base block (9), a supporting core block (10) and a supporting spring (11); the supporting base block (9) is arranged at the upper end of the interior of the protective shell (1) corresponding to the substrate slot (7) and is fixedly connected to the protective shell (1); the interior of the supporting base block (9) is set as a hollow structure; the supporting core block (10) is arranged inside the supporting base block (9) and is embedded and connected to the supporting base block (9); the lower part of the supporting core block (10) protrudes from the bottom of the supporting base block (9) and abuts against the substrate sensor; the supporting spring (11) is arranged inside the supporting base block (9) and its two ends abut against the supporting base block (9) and the supporting core block (10) respectively.

5. A protective structure for a fiber Bragg grating sensing system as claimed in claim 4, characterized in that: It also includes a supporting protective pad (12), which is arranged at the bottom of the supporting core block (10) and fixedly connected to the supporting core block (10), and the supporting core block (10) is in contact with the substrate sensor (2) through the supporting protective pad (12).

6. A protective structure for a fiber Bragg grating sensing system as claimed in claim 5, characterized in that: The protection mechanism comprises a protection support rod (13), a protection spring (14) and a protection top block (15); the protection support rod (13) is provided with two groups, the two groups of the protection support rod (13) are symmetrically arranged at the upper end of the interior of the protection shell (1) and are fixedly connected to the protection shell (1); the protection support rod (13) is vertically arranged; the protection spring (14) is provided with two groups, the two groups of the protection spring (14) are symmetrically arranged at the upper end of the interior of the protection shell (1) corresponding to the two groups of the protection support rod (13), and the upper ends of the protection springs are fixedly connected to the protection shell (1). The two groups of protection springs (14) are respectively sleeved on the outer sides of the two groups of protection support rods (13); the two groups of protection top blocks (15) are respectively arranged at the lower ends of the two groups of protection springs (14) and are fixedly connected with the corresponding protection springs (14); a receiving groove is provided on the inner side of the upper part of the protection top block (15); the lower part of the protection support rod (13) is located in the receiving groove and a distance is left between the side wall of the receiving groove; the bottom of the protection top block (15) is in contact with the linear sensor.

7. A protective structure for a fiber Bragg grating sensing system as claimed in claim 6, characterized in that: Two groups of protection mechanisms are provided, and the two groups of protection mechanisms are symmetrically arranged at the inner upper end of the protection shell (1) corresponding to the two groups of linear slots (8).

8. A protective structure for a fiber Bragg grating sensing system as claimed in claim 7, characterized in that: The protective shell (1) further comprises a base (16), wherein the base (16) is arranged at the bottom of the protective shell (1) and is fixedly connected to the protective shell (1) by means of screws; the supporting upright rod (3) is arranged at the upper end of the base (16) and is fixedly connected to the base (16); a limiting protrusion is provided at the upper end of the base (16) corresponding to the protective shell (1); the limiting protrusion is located on the inner side of the lower part of the protective shell (1) and is arranged to fit the inner wall of the protective shell (1).

9. A protective structure for a fiber Bragg grating sensing system as claimed in claim 8, characterized in that: It also includes a connection head (17) and an adapter (18), wherein the connection head (17) is arranged at one end of the upper part of the protective shell (1) and is embedded in the protective shell (1), the connection head (17) passes through the protective shell (1), and the adapter (18) is provided with two groups, the two groups of adapters (18) are symmetrically arranged on both sides of one end of the protective shell (1) away from the connection head (17) and are embedded in the protective shell (1), the adapter (18) passes through the protective shell (1), and the connection head (17) and the adapter (18) are respectively connected to the two ends of the sensor (2).

10. A protective structure for a fiber Bragg grating sensing system as claimed in claim 9, characterized in that: It also comprises a connecting terminal (19), wherein the connecting terminal (19) is arranged between the sensor (2) and the connecting head (17) and the adapter (18), and the connecting head (17) and the adapter (18) are connected to the end of the sensor (2) via the connecting terminal (19).

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