Fiber grating sensor stress support

Abstract

The utility model discloses a fiber bragg grating sensor stress support, and relates to the technical field of fiber bragg grating sensors, in particular to a fiber bragg grating sensor stress support, which is fixedly arranged in a sensor shell and comprises a support plate, a cover body, an armor optical cable and an elastic element, the cover body is fixedly connected with one side wall of the support plate, and the cover body is fixedly connected with the other side wall of the support plate. The optical fiber grating sensor stress support is fixedly installed in an optical fiber grating sensor and used for supporting the optical fiber grating and shielding external disordered vibration, the optical fiber grating only feels the stress of intrusion vibration needing to be collected, and the stress of the optical fiber grating sensor can be collected. External disordered vibration disturbance is avoided, the to-be-collected stress sensed by the grating is more accurate, and the overall sensitivity of the fiber grating sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber grating sensors, in particular to an optical fiber grating sensor stress bracket. Background Art

[0002] Fiber Bragg grating sensors are used to detect external intrusion vibration signals and are the core equipment for signal acquisition. Fiber Bragg grating sensors need to be installed in places where vibrations can be detected in order to effectively and accurately collect intrusion vibration signals.

[0003] Since the fiber Bragg grating sensor will vibrate when in use, it will cause uneven stress inside. Since the grating cannot distinguish whether the vibration is an intrusion vibration signal that needs to be collected or external random vibration, the stress felt by the grating will be inaccurate, and the overall sensitivity of the fiber Bragg grating sensor will decrease.

[0004] In the published Chinese patent application, the publication number is CN216695253U, and the patent name is a stress bracket for a fiber grating sensor. Although, the prior art places the sensor body into the installation groove, inserts the bottom fixing block into the corresponding fixing groove, until the cover plate completely covers the internal fixing plate, at which time the upper threaded hole corresponds to the lower threaded hole, and fixes it by bolts, the shock-absorbing spring rod can effectively reduce shock and reduce internal stress when the sensor body generates vibration during operation. The prior art sets a shock-absorbing spring rod on the periphery of the sensor body, and uses the elasticity of the spring rod to achieve the effect of reducing shock and reducing stress. However, when the vibration detected by the fiber grating sensor is relatively small, and the vibration amplitude to be detected is less than the elasticity of all spring structures, it cannot achieve the effect of reducing stress. Moreover, when the prior art uses the spring rod to implement shock reduction, it is impossible to distinguish the intrusion vibration signal to be detected, resulting in the reduction of the intrusion vibration signal to be detected. In this case, the stress is reduced, resulting in inaccurate stress felt by the grating, and the overall sensitivity of the fiber grating sensor is reduced.

[0005] In summary, in order to solve the problem of inaccurate stress felt by the grating due to external chaotic vibration disturbance in the prior art, this case is specially proposed to solve it. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the utility model provides a fiber grating sensor stress bracket, which solves the problems raised in the above background technology.

[0008] (II) Technical solution

[0009] To achieve the above purpose, the utility model is implemented through the following technical solutions: a fiber grating sensor stress bracket, which is fixedly installed inside the sensor housing, including a support plate, a cover body, an armored optical cable and an elastic element, the cover body is fixedly connected to a side wall of the support plate, the end of the armored optical cable passes through the cover body, and a grating is engraved on the exposed part of the end of the armored optical cable, and the grating is located inside the cover body; one end of the elastic element abuts against the grating, and the elastic element and the grating are fixedly connected by an adhesive, and the other end of the elastic element passes through the cover body; the outside of the grating is provided with a first cylinder, and the outside of the first cylinder is provided with a second cylinder; the interior of the first cylinder is filled with a first buffer layer, the first buffer layer wraps the grating and wraps the fixed connection part between the elastic element and the grating; the second buffer layer is filled between the first cylinder and the second cylinder.

[0010] Optionally, the first buffer layer and the second buffer layer are both made of thermoplastic polyurethane elastomer material.

[0011] Optionally, the thermoplastic polyurethane elastomer is made into a honeycomb lattice structure by 3D printing.

[0012] Optionally, a heat insulation layer is provided between the cover body and the second cylinder body.

[0013] Optionally, the thermal insulation layer includes an aerogel felt layer, a ceramic silicone rubber layer, and a polytetrafluoroethylene layer.

[0014] Optionally, the elastic element is in a cantilever beam structure as a whole, the elastic element is made of a metal sheet, and a plurality of vacuum cavities are arranged inside the elastic element.

[0015] (III) Beneficial effects

[0016] The utility model provides a fiber grating sensor stress bracket, which has the following beneficial effects:

[0017] 1. The fiber grating sensor stress bracket is fixedly installed inside the fiber grating sensor to support the grating and shield external chaotic vibrations so that the grating only senses the stress of the intrusive vibration that needs to be collected, avoiding external chaotic vibration disturbances, making the stress to be collected felt by the grating more accurate, and improving the overall sensitivity of the fiber grating sensor.

[0018] 2. A fiber grating sensor stress bracket wraps the grating through the first buffer layer and the second buffer layer. The chaotic vibration outside the fiber grating sensor cannot pass through the first buffer layer and the second buffer layer to cause stress to the grating, that is, the stress influence caused by the external chaotic vibration is shielded by the first buffer layer and the second buffer layer; the vibration to be collected is detected by the exposed end of the elastic element, and the elastic element applies stress to the grating through the other end after the stress change occurs. The grating receives the stress change and its wavelength shifts, thereby achieving the purpose of accurately collecting the intrusion vibration signal. The stress felt by the grating is the stress transmitted by the intrusion vibration to be collected. At this time, the stress felt by the grating is more accurate, which greatly improves the sensitivity of the fiber grating sensor.

[0019] 3. The first buffer layer and the second buffer layer of the fiber grating sensor stress bracket are both made of thermoplastic polyurethane elastomer material, and the thermoplastic polyurethane elastomer is made into a honeycomb lattice structure by 3D printing. When the thermoplastic polyurethane elastomer is impacted, it collapses in a controlled manner, thereby effectively absorbing vibration energy and achieving a high-precision shock absorption and buffering effect. Compared with the use of springs and other shock absorption buffers, the use of thermoplastic polyurethane elastomer to make a honeycomb lattice structure can buffer smaller vibrations and prevent small external random vibrations from causing stress to the grating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a fiber grating sensor stress bracket of the utility model;

[0022] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of a fiber grating sensor stress bracket of the utility model;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of a fiber grating sensor stress bracket of the utility model;

[0024] Figure 4 This is a schematic diagram of the partially enlarged structure of the first buffer layer of a fiber grating sensor stress support of the utility model;

[0025] Figure 5 It is a schematic diagram of the partial cross-sectional structure of a fiber grating sensor;

[0026] Figure 6 for Figure 5 Enlarged structural diagram at A in the middle.

[0027] In the figure: 1, support plate; 2, cover body; 3, elastic element; 4, grating; 5, first buffer layer; 501, thermoplastic polyurethane elastomer; 6, first cylinder; 7, second buffer layer; 8, second cylinder;

[0028] 9. Aerogel felt layer; 10. Ceramic silicone rubber layer; 11. Polytetrafluoroethylene layer; 12. Armored optical cable; 13. Sensor housing; 14. Pull rod housing; 15. Displacement pull rod; 16. Spring. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indications or implications.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0031] See also Figures 1 to 6 The utility model provides a technical solution: a fiber grating sensor stress bracket, which is fixedly installed inside a sensor housing 13, and includes a support plate 1, a cover body 2, an armored optical cable 12 and an elastic element 3. The cover body 2 is fixedly connected to a side wall of the support plate 1, and the end of the armored optical cable 12 passes through the cover body 2, and a grating 4 is engraved on the exposed part of the end of the armored optical cable 12, and the grating 4 is located inside the cover body 2.

[0032] The support plate 1 is provided with bolt holes for fixing the fiber grating sensor stress bracket shown in the present application to the fiber grating sensor. The grating 4 includes a displacement fiber grating and a temperature compensation fiber grating.

[0033] One end of the elastic element 3 abuts against the grating 4 , and the elastic element 3 and the grating 4 are fixedly connected by an adhesive, and the other end of the elastic element 3 passes through the cover body 2 .

[0034] One end of the elastic element 3 is used to be fixedly connected to the grating 4 to transfer stress to the grating 4. The other end of the elastic element 3 is used to receive vibration, and the elastic element 3 transfers stress to the grating 4 after being vibrated.

[0035] The grating 4 is sleeved with a first cylinder 6, and the first cylinder 6 is sleeved with a second cylinder 8. The first cylinder 6 is filled with a first buffer layer 5, which wraps the grating 4 and the fixed connection part between the elastic element 3 and the grating 4 (referring to the end of the elastic element 3 close to the grating 4). The second buffer layer 7 is filled between the first cylinder 6 and the second cylinder 8.

[0036] Among them, the grating 4 is wrapped by the first buffer layer 5 and the second buffer layer 7, and the chaotic vibration outside the fiber Bragg grating sensor cannot pass through the first buffer layer 5 and the second buffer layer 7 to cause stress to the grating 4, that is, the stress caused by the external chaotic vibration is shielded by the first buffer layer 5 and the second buffer layer 7. The vibration to be collected is detected or received through the exposed end of the elastic element 3 (referring to the end of the elastic element 3 away from the grating 4). After the stress change occurs in the elastic element 3, the stress is applied to the grating 4 through the other end. The grating 4 receives the stress change, and the wavelength of the grating 4 is shifted, thereby achieving the purpose of accurately collecting the intrusion vibration signal. The stress felt by the grating 4 is the stress transmitted by the intrusion vibration to be collected. At this time, the stress felt by the grating 4 is more accurate, which greatly improves the sensitivity of the fiber Bragg grating sensor.

[0037] Specifically, the first buffer layer 5 and the second buffer layer 7 are both made of thermoplastic polyurethane elastomer 501. The thermoplastic polyurethane elastomer 501 is made into a honeycomb lattice structure by 3D printing.

[0038] The first buffer layer 5 and the second buffer layer 7 are both made of thermoplastic polyurethane elastomer 501, and the thermoplastic polyurethane elastomer 501 is made into a honeycomb lattice structure by 3D printing. Figure 5 When the thermoplastic polyurethane elastomer 501 is impacted, it collapses in a controlled manner, thereby effectively absorbing vibration energy and achieving a high-precision shock-absorbing and buffering effect. Compared with using springs and other shock-absorbing and buffering methods, the honeycomb lattice structure made of the thermoplastic polyurethane elastomer 501 can buffer smaller vibrations and prevent tiny external random vibrations from causing stress to the grating 4.

[0039] Specifically, a heat insulation layer is provided between the cover body 2 and the second cylinder body 8 .

[0040] The heat insulation layer is used to prevent external heat from being transferred to the grating 4 , thereby avoiding the stress effect on the grating 4 caused by high temperature.

[0041] Specifically, the heat insulation layer includes an aerogel felt layer 9 , a ceramic silicone rubber layer 10 , and a polytetrafluoroethylene layer 11 .

[0042] The aerogel felt layer 9, the ceramic silicone rubber layer 10 and the polytetrafluoroethylene layer 11 are all used for heat insulation.

[0043] Specifically, the elastic element 3 is a cantilever beam structure as a whole, the elastic element 3 is made of a metal sheet, and a plurality of vacuum cavities are arranged inside the elastic element 3 .

[0044] Among them, by arranging a vacuum cavity inside the elastic element 3 and using the vacuum cavity layer to achieve heat insulation, the heat conduction of the elastic element 3 itself is greatly reduced, so that the elastic element 3 also achieves the purpose of heat insulation.

[0045] refer to Figure 5 Figure 6 In specific implementation, a fiber Bragg grating sensor stress bracket shown in the present application can be installed inside the fiber Bragg grating sensor. The fiber Bragg grating sensor includes a sensor housing 13, a rod housing 14, a displacement rod 15, and a spring 16. A fiber Bragg grating sensor stress bracket shown in the present application is fixedly installed inside the sensor housing 13. The rod housing 14 is fixedly installed at one end of the sensor housing 13, the displacement rod 15 is slidably arranged in the rod housing 14, one end of the spring 16 is fixedly connected to the displacement rod 15, and the other end of the spring 16 is fixedly connected to the exposed end of the elastic element 3 (referring to the end away from the grating 4). After the displacement rod 15 is subjected to the external force to be measured (referring to the intrusion vibration to be collected), a slight displacement occurs relative to the rod housing 14, and the spring 16 converts the slight displacement of the displacement rod 15 into stress, which in turn acts on the grating 4 through the elastic element 3. The grating 4 receives the change of stress, and after the grating 4 is affected by the stress, its wavelength shifts, thereby realizing the detection of the displacement.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fiber grating sensor stress bracket, which is fixedly installed inside a sensor housing (13), characterized in that: It comprises a support plate (1), a cover body (2), an armored optical cable (12) and an elastic element (3), wherein the cover body (2) is fixedly connected to a side wall of the support plate (1), an end of the armored optical cable (12) passes through the cover body (2), and a grating (4) is engraved on an exposed portion of the end of the armored optical cable (12), and the grating (4) is located inside the cover body (2); One end of the elastic element (3) abuts against the grating (4), and the elastic element (3) and the grating (4) are fixedly connected by an adhesive, and the other end of the elastic element (3) penetrates the cover body (2); The grating (4) is sleeved with a first cylinder (6), and the first cylinder (6) is sleeved with a second cylinder (8); the first cylinder (6) is filled with a first buffer layer (5) inside, and the first buffer layer (5) wraps the grating (4) and the fixed connection portion between the elastic element (3) and the grating (4); and a second buffer layer (7) is filled between the first cylinder (6) and the second cylinder (8).

2. The fiber grating sensor stress bracket according to claim 1, characterized in that: The first buffer layer (5) and the second buffer layer (7) are both made of thermoplastic polyurethane elastomer (501) material.

3. A fiber grating sensor stress bracket according to claim 2, characterized in that: The thermoplastic polyurethane elastomer (501) is manufactured into a honeycomb lattice structure by 3D printing.

4. The fiber grating sensor stress bracket according to claim 1, characterized in that: A heat insulation layer is provided between the cover body (2) and the second cylinder body (8).

5. The fiber grating sensor stress bracket according to claim 4, characterized in that: The heat insulation layer comprises an aerogel felt layer (9), a ceramic silicone rubber layer (10), and a polytetrafluoroethylene layer (11).

6. The fiber grating sensor stress bracket according to claim 1, characterized in that: The elastic element (3) is in the form of a cantilever beam structure as a whole; the elastic element (3) is made of a metal sheet; and a plurality of vacuum cavities are arranged inside the elastic element (3).

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