Fiber bragg grating displacement sensor with anti-disassembly self-destruction casting shell

Abstract

The utility model discloses a fiber bragg grating displacement sensor with an anti-tamper self-destruction casting shell, which comprises an anti-tamper self-destruction shell, a displacement measurement conduction unit, a measurement unit and a self-destruction device, and is characterized in that the displacement measurement conduction unit and the measurement unit are both mounted on the anti-tamper self-destruction shell; the measuring unit comprises a modularized temperature compensation substrate, a modularized displacement elastic sheet, a fiber inlet pressing plate and a fiber inlet pressing plate fixing bolt; the modularized temperature compensation substrate and the substrate of the modularized displacement elastic sheet are both made of inorganic elastic materials and are packaged in a solid state. The utility model aims to reduce the processing amount, reduce the batch production cost, improve the processing efficiency, improve the safety and confidentiality of monitoring work, and prevent human factors from influencing the authenticity of monitoring data; the measuring center position and the vertical direction of a measured object point are kept unchanged all the time, installation is more flexible and convenient, the guide block uses a screw to further limit radial run-out of the sliding column, and the measuring precision is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber grating sensors, in particular to an optical fiber grating displacement sensor with an anti-disassembly self-destructive casting shell. Background Art

[0002] Displacement is one of the most important and basic physical quantities that need to be monitored in various fields. It plays a vital role in the completion of various projects. Most of the displacement sensors used in traditional displacement measurement devices are based on electromagnetic effect, capacitance effect, etc. as basic principles to convert displacement into electrical signals. Although higher accuracy and resolution can be achieved during measurement, this type of weak current sensor has defects such as poor anti-electromagnetic interference performance, great influence of temperature, easy damage or zero drift in harsh environment for long-term use, short measurement distance, etc., and it is increasingly difficult to meet today's monitoring requirements in terms of continuity, real-time and measurement sensitivity. This undoubtedly brings great inconvenience to basic engineering measurement.

[0003] In order to reduce the processing volume, lower the cost of mass production, improve processing efficiency, enhance the safety and confidentiality of monitoring work, avoid human factors affecting the authenticity of monitoring data, and solve the current problems of fiber optic sensors such as poor durability and stability, it is urgently necessary to develop a fiber optic Bragg grating displacement sensor with an anti-dismantling self-destructive cast shell. Utility Model Content

[0004] The utility model provides a fiber grating displacement sensor with an anti-disassembly self-destructive casting shell to solve the defects of weak current sensors in the prior art, such as poor anti-electromagnetic interference performance, great influence of temperature, easy damage or zero drift in harsh environment for long-term use, short measurement distance, etc., and it is increasingly difficult to meet the current monitoring requirements in terms of continuity, real-time and measurement sensitivity, which undoubtedly brings great inconvenience to basic engineering measurement.

[0005] To solve the above problems, the technical solutions provided by the present invention are as follows:

[0006] The utility model provides a fiber Bragg grating displacement sensor with an anti-disassembly self-destruction casting housing, comprising an anti-disassembly self-destruction housing (1), a displacement measurement transmission unit (2), a measurement unit (3) and a self-destruction device (4), wherein the displacement measurement transmission unit (2) and the measurement unit (3) are both mounted on the anti-disassembly self-destruction housing (1);

[0007] The anti-disassembly self-destruction housing (1) comprises a casting base (101), a cover plate (102), a pointed screw (103), a locking cap of an optical fiber protection tube (104), a guide sleeve (105), an expansion pin (106) and a tension ring (107); the casting base (101) is matched with the cover plate (102); the displacement measurement transmission unit (2) comprises a slide rail (201), a limit bolt group (202), a slide rail fixing bolt group (203), a slider (204), an inclined block (205), an inclined block fixing bolt (206), a hanging plate (207) and a plurality of movable members. ), a tension spring (208), a tension spring fixing bolt group (209), a guide column (210), an inner thread fisheye bearing (211), a sliding column (212), a sliding column limit screw (213), a guide block and a guide block fixing bolt (215); the measuring unit (3) comprises a modular temperature compensation substrate (301), a modular displacement spring (302), a fiber feed pressure plate (303) and a fiber feed pressure plate fixing bolt (304); the substrates of the modular temperature compensation substrate (301) and the modular displacement spring (302) are both made of inorganic elastic materials, and are both solid-state packaging methods;

[0008] Wherein, a fiber inlet support plate (101-3) and a fiber outlet support plate (101-4) are respectively arranged on both sides of the upper part of the casting base (101), and the fiber inlet support plate (101-3) is used to install the modular temperature compensation substrate (303); a first threaded hole (101-1) is provided on the fiber outlet end surface of the casting base (101) for installing the guide sleeve (105); a guide column (210) of the displacement measurement transmission unit (2) is slidably connected in the guide sleeve (105); a second threaded hole (101-2) is also provided on the fiber outlet end surface of the casting base (101) for installing the optical fiber protection tube locking cap (104);

[0009] A first notch (101-5) is provided on the long side surface at the lower inner side of the casting base (101), third threaded holes (101-6) are provided at both ends of the first notch (101-5), and a plurality of fourth threaded holes (101-7) are provided in the middle of the first notch (101-5); a mounting through hole is provided on the slide rail (201), which is used to install a limiting bolt group (202), which passes through the third threaded hole (101-6) and the mounting through hole and is locked by a nut to fix the slide rail (201), and serves as a movable limiting structure of the slider (204);

[0010] The fourth threaded hole (101-7) and the installation through hole of the slide rail (201) are installed with a slide rail fixing bolt group (203) for fastening the slide rail (201); the slider (204) is installed on the upper side of the slide rail (201) and can be flexibly moved linearly; the inclined block fixing bolt (206) is used to fix the inclined block (205) on the two sliders (204); the top of the inclined block (205) is a wedge block, the top is an inclined surface, the bottom of the inclined block (205) is a rectangular parallelepiped and the bottom is provided with a first through hole (205-1), a strip inclined surface is arranged in the center of the center line of the rectangular parallelepiped, and a rectangular parallelepiped small block is arranged at the lower end of the inclined surface to open a fifth threaded hole (205-2), one end of the guide column (210) passes through the hanging plate (207) and is threadedly connected to the fifth threaded hole (205-2), and the other end of the guide column (210) passes through the guide sleeve (105) and is threadedly connected to the inner thread fisheye bearing (211).

[0011] According to an optional embodiment of the utility model, a square first groove (101-8) is provided on the bottom surface of the casting base (101), a first countersunk hole (101-9) is provided in the first groove (101-8), a guide block is tightly fitted in the first groove (101-8), a bolt (215) passes through the first countersunk hole (101-9) and is threadedly connected with a sixth threaded hole (214-1) provided on the short surface of the guide block; a second through hole (214-2) is provided on the long surface of the guide block; a seventh threaded hole (214-3) is provided on the long surface perpendicular to the axis of the second through hole of the guide block for installing a slide column limit screw (213); the slide column (212) is slidably connected in the second through hole (214-2) and the upper and lower ends are respectively in sliding contact with the modular displacement spring piece (302) of the measuring unit (3) and the inclined surface of the wedge block of the inclined block (205), so as to convert the displacement of the inner thread fisheye bearing (211) into the deformation of the modular displacement spring piece (302).

[0012] According to an optional embodiment of the utility model, a twelfth threaded hole (101-14) is provided on the fiber inlet side of the casting base (101), and a tension spring fixing bolt group (209) is installed to fix one end of the tension spring (208); the other end of the tension spring (208) is hung on the hanging plate (207), and when the inner thread fisheye bearing (211) pulls the slider (204) to move through the guide column (210), the tension spring (208) is stretched, and when the external force on the inner thread fisheye bearing (211) is removed, the slider (204) is reset under the action of the tension spring (208).

[0013] According to an optional embodiment of the utility model, the casting base (101) is provided with a second notch (101-10) on the fiber inlet side of the upper side, and a ninth threaded hole (101-11) is provided in the second notch (101-10), and the fiber inlet pressure plate fixing bolt (304) passes through the fiber inlet support plate (101-3), the modular displacement spring sheet (302), and the modular temperature compensation substrate (301) and engages with the ninth threaded hole (101-11), and the end surface of the casting base (101) is provided with a A second inner cylindrical groove (101-12) with a larger inner diameter and a smaller outer diameter is provided. A tenth threaded hole (101-13) is provided at the bottom of the inner cylindrical groove (101-12) for installing a pointed screw (103). An expansion pin (106) passes through a columnar countersunk hole (102-1) provided on the cover plate (102) and passes through a tensioning ring (107). The expansion pin (106) contacts the pointed screw (103) and is pressed into the inner cylindrical groove (101-12) to fix the cover plate (102).

[0014] According to an optional embodiment of the utility model, the center lines of the slide rail (201), the slider (204), the inclined block (205), the inner thread fisheye bearing (211), the slide column (212), and the modular displacement spring (302) are coplanar.

[0015] According to an optional embodiment of the utility model, the self-destruct device (4) comprises a self-destruct screw (401) and a strong spring (402), and the strong spring (402) is inserted on the self-destruct screw (401).

[0016] According to an optional embodiment of the utility model, an eleventh threaded hole (102-2) is provided on the cover plate (102) for installing a self-destruct screw (401), and a strong spring (402) is mounted on the self-destruct screw (401). When the cover plate (102) is separated from the casting base (101), or when the self-destruct screw (401) is removed and pulled out, the strong spring (402) takes effect, and the self-destruct screw (401) and the strong spring (402) work together to damage the modular temperature compensation substrate (301).

[0017] Beneficial effects: The embodiment of the utility model provides a fiber Bragg grating displacement sensor with an anti-disassembly self-destructive casting shell, including an anti-disassembly self-destructive shell, a displacement measurement transmission unit, a measuring unit and a self-destructing device, wherein the displacement measurement transmission unit and the measuring unit are both installed on the anti-disassembly self-destructive shell; the measuring unit includes a modular temperature compensation substrate, a modular displacement spring, a fiber feed plate and a fiber feed plate fixing bolt; the substrates of the modular temperature compensation substrate and the modular displacement spring are both inorganic elastic materials, and are both solid-state packaging methods; compared with the prior art, the utility model has the following advantages: (1) All transmission and measurement components are made of inorganic materials, and have the advantages of anti-electromagnetic interference, super long life and long-term detection. (2) The utility model can reduce the processing volume, reduce the cost of mass production, improve processing efficiency, enhance the safety and confidentiality of monitoring work, and avoid human factors affecting the authenticity of monitoring data. The utility model is tightly connected to the object to be measured through an inner thread fisheye bearing, and the inner thread fisheye bearing is threadedly connected to the guide column. When the displacement changes, the guide column drives the inclined block to move linearly. Because the guide post moves in the guide post guide sleeve and the inclined block is installed on the slider and is restricted by the slide rail to perform precise linear motion, the displacement transmission is linear and accurate. The spring applies a reaction force to the guide post through the spring hanging plate, keeping the inner thread fisheye bearing and the measured object tightly connected at all times and the center position of the fisheye bearing and the vertical direction of the measured point always remain unchanged. The guide block uses screws to further limit the radial runout of the slide post, greatly reducing the measurement error. (3) The modular temperature compensation substrate is used as a temperature compensation correction while simultaneously measuring the ambient temperature of the installation location, which is not affected by temperature; further, the modular temperature compensation substrate and modular displacement spring are special glass solid-state packaging, which has the advantages of long life, anti-oxidation, anti-fatigue, and not easy to disengage. (4) The utility model is suitable for long-term measurement of displacement changes of gaps in structures such as splicing gaps of shield machine segments for tunnels. The displacement measurement transmission unit, measurement unit, and housing are all made of metal. They use internal thread fisheye bearings and can be flexibly installed to adapt to anchors at different angles. The detection process does not use electricity and is an intrinsically safe sensor. It has strong anti-electromagnetic interference performance, can be used for a long time in harsh environments and is not easy to damage. It has a long measurement distance and can meet current monitoring requirements in terms of continuity, real-time and measurement sensitivity. (5) After the sensor is processed, the displacement and temperature change are calibrated and a fitting curve is generated. After installation, the starting wavelength and ambient temperature are recorded. Subsequent measurements can be substituted into the pseudo formula based on the measured value to obtain the displacement change, and there is no zero drift phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments or 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 described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing provided in an embodiment of the present application.

[0020] Figure 2 A schematic diagram of the internal structure of a fiber Bragg grating displacement sensor with a disassembly-proof self-destructive cast housing provided in an embodiment of the present application.

[0021] Figure 3 A front view of a fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing provided in an embodiment of the present application.

[0022] Figure 4 A bottom view of a fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing provided in an embodiment of the present application.

[0023] Figure 5 A top view of a fiber Bragg grating displacement sensor with a disassembly-proof and self-destructive cast housing provided in an embodiment of the present application.

[0024] Figure 6 This is a rear view of a fiber grating displacement sensor with a disassembly-proof self-destructive casting housing proposed by the utility model.

[0025] Figure 7 for Figure 5 Cross-sectional view at D1-D2 in FIG.

[0026] Figure 8 for Figure 5 Cross-sectional view at E1-E2 in FIG.

[0027] Explanation of the reference numerals: 1. Anti-disassembly self-destruction housing; 101. Casting base; 101-1. First threaded hole; 101-2. Second threaded hole; 101-3. Fiber inlet support plate; 101-4. Fiber outlet support plate; 101-5. First notch; 101-6. Third threaded hole; 101-7. Fourth threaded hole; 101-8. First groove; 101-9. First countersunk hole; 101-10. Second notch; 101-11. Ninth threaded hole; 101-12. Inner cylindrical groove; 101-13. Tenth threaded hole; 101-14. Twelfth threaded hole; 102. Cover plate; 102-1. Columnar countersunk hole; 102-2. Eleventh threaded hole; 103. Pointed screw; 104. Fiber optic protection tube locking cap; 105. Guide sleeve; 106. Expansion pin, 107. Tension ring; 2. Position Shift measurement transmission unit; 201, slide rail; 202, limit bolt group; 203, slide rail fixing bolt group; 204, slider; 205, inclined block; 205-1, first through hole; 205-2, fifth threaded hole; 206, inclined block fixing bolt; 207, hanging plate; 208, tension spring; 209, tension spring fixing bolt group; 210, guide column; 211, internal thread fisheye bearing; 212, slide column 213, slide column limit screw; 214, guide block; 214-1, sixth threaded hole; 214-2, second through hole; 214-3, seventh threaded hole; 215 guide block fixing bolt; 3, measuring unit; 301, temperature compensation substrate 302, modular displacement spring; 303, fiber feed pressure plate; 304, fiber feed pressure plate fixing bolt; 4, self-destruct device; 401, self-destruct screw, 402, strong spring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] like Figures 1 to 8 As shown, an embodiment of the utility model provides a structural schematic diagram of a fiber Bragg grating displacement sensor with an anti-disassembly self-destructive casting housing.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a fiber Bragg grating displacement sensor with an anti-disassembly self-destruction casting housing comprises an anti-disassembly self-destruction housing 1, a displacement measurement transmission unit 2, a measurement unit 3 and a self-destruction device 4, wherein the displacement measurement transmission unit 2 and the measurement unit 3 are both mounted on the anti-disassembly self-destruction housing 1.

[0031] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the anti-disassembly self-destruction housing 1 includes a casting base 101, a cover plate 102, a pointed screw 103, a fiber protection tube locking cap 104, a guide sleeve 105, an expansion pin 106 and a tension ring 107. In order to facilitate the assembly and maintenance of the interior of the anti-disassembly self-destruction housing 1, a box-shaped casting base 101 plus a cover plate 102 is adopted, and the casting base 101 is matched with the cover plate 102. The displacement measurement transmission unit 2 includes a slide rail 201, a limit bolt group 202, a slide rail fixing bolt group 203, a slider 204, an inclined block 205, an inclined block fixing bolt 206, a hanging plate 207, a tension spring 208, a tension spring fixing bolt group 209, a guide column 210, an inner thread fisheye bearing 211, a slide column 212, a slide column limit screw 213, a guide block and a guide block fixing bolt 215. The measuring unit 3 includes a modular temperature compensation substrate 301, a modular displacement spring 302, a fiber feed plate 303 and a fiber feed plate fixing bolt 304; the substrates of the modular temperature compensation substrate 301 and the modular displacement spring 302 are both made of inorganic elastic materials and are both solid-state packaging.

[0032] The fiber inlet support plate 101-3 and the fiber outlet support plate 101-4 are respectively arranged on both sides of the upper part of the casting base 101 box, and the fiber inlet support plate 101-3 is used to install the modular temperature compensation substrate 303. The first threaded hole 101-1 is provided on the fiber outlet end face of the casting base 101 for installing the guide sleeve 105. The guide sleeve 105 is slidably connected with the guide column 210 of the displacement measurement transmission unit 2. The second threaded hole 101-2 is also provided on the fiber outlet end face of the casting base 101 for installing the optical fiber protection tube locking cap 104.

[0033] A second threaded hole 101-2 is provided on the fiber inlet and outlet end surface of the casting base 101 for installing the optical fiber protection tube locking cap 104. In order to facilitate the displacement of the guide column 210, a first notch 101-5 is provided on the long side surface at the lower inner side of the base 101, third threaded holes 101-6 are provided at both ends of the first notch 101-5, and a plurality of fourth threaded holes 101-7 are provided in the middle. There is an installation through hole on the slide rail 201 for installing the limiting bolt group 202. The limiting bolt group 202 is passed through the third threaded hole 101-6 and the installation through hole, and the slide rail 201 is fixed by locking the nut, and serves as a moving limiting structure of the slider 204. In order to further fix the slide rail 201, the slide rail fixing bolt group 203 is installed in the fourth threaded hole 101-7 and the slide rail installation through hole to further tighten the slide rail 201; the slider 204 is installed on the upper side of the slide rail 201 and can be flexibly moved linearly. A plurality of first through holes 205-1 are provided on the lower end surface of the inclined block 205, and the inclined block fixing bolts 206 fix the inclined block 205 on the two sliders 204; the top of the inclined block 205 is a wedge-shaped block, and the top is an inclined surface. The bottom of the inclined block 205 is a rectangular parallelepiped, and the first through hole 205-1 is provided at the bottom. A strip inclined surface is provided in the center of the center line of the rectangular parallelepiped, and a rectangular parallelepiped small block is provided at the lower end of the inclined surface to provide a fifth threaded hole 205-2. One end of the guide column 210 passes through the hanging plate 207 and is threadedly connected to the fifth threaded hole 205-2, and the other end of the guide column 210 passes through the guide sleeve 105 and is threadedly connected to the inner fisheye bearing 211.

[0034] In order to transmit the displacement of the inner thread fisheye bearing 211 to the measuring unit 3, a square first groove 101-8 is provided on the bottom surface of the casting base 1, a first countersunk hole 101-9 is provided in the first groove 101-8, a guide block 214 is tightly fitted in the first groove 101-8, and the fixing bolt 215 of the guide block 214 passes through the first countersunk hole 101-9 and is threadedly connected with the sixth threaded hole 214-1 provided on the short surface of the guide block 214. A second through hole 214-2 is provided on the long surface of the guide block 214, and a seventh threaded hole 214-3 is provided on the long surface of the guide block 214 perpendicular to the second through hole axis for installing the slide column limit screw 213. The slide column 212 is slidably connected in the second through hole 214-2 and the upper and lower ends are respectively in sliding contact with the modular displacement spring piece 302 of the measuring unit 3 and the inclined surface of the wedge block of the inclined block 205, so as to convert the displacement of the inner thread fisheye bearing 211 into the deformation of the modular displacement spring piece 302.

[0035] In order to facilitate the reset of the slider 204, a twelfth threaded hole 101-14 is provided on the fiber inlet side of the casting base 1 for installing a tension spring fixing bolt group 209 to fix one end of the tension spring 208. The other end of the tension spring 208 is hung on the hanging plate 207. When the inner fisheye bearing 211 pulls the slider 204 to move through the guide column 210, the tension spring 208 is stretched. When the external force on the inner fisheye bearing 211 is removed, the slider 204 is reset under the action of the tension spring 208.

[0036] In order to fix and install the measuring unit 3, the base 101 has a second notch 101-10 on the fiber inlet side of the upper side, and a ninth threaded hole 101-11 is provided in the second notch. The fiber inlet pressure plate fixing bolt 304 passes through the fiber inlet pressure plate, the modular displacement spring 302, and the modular temperature compensation substrate 301 to engage with the ninth threaded hole 101-11. The end face of the base 101 has a two-layer inner cylindrical groove 101-12 with a large inner diameter and a small outer diameter. The bottom of the inner cylindrical groove 101-12 has a tenth threaded hole 101-13 for installing the pointed screw 103. The expansion pin 106 passes through the columnar countersunk hole 102-1 provided on the cover plate 102, passes through the tension ring 107, and the expansion pin 106 contacts the pointed screw 103 and is pressed into the inner cylindrical groove 101-12 to fix the cover plate 102.

[0037] The center lines of the slide rail 201, the slider 204, the inclined block 205, the inner thread fisheye bearing 211, the slide column 212, and the modular displacement spring 302 in this embodiment are coplanar. The self-destruct device 4 includes a self-destruct screw 401 and a strong spring 402, and the strong spring 402 is inserted into the self-destruct screw 401. The cover plate 102 is provided with an eleventh threaded hole 102-2 for installing the self-destruct screw 401, and the strong spring 402 is mounted on the self-destruct screw 401. When the cover plate 102 is separated from the casting base 101, or when the self-destruct screw 401 is removed and pulled out, the strong spring 402 takes effect, and the self-destruct screw 401 and the strong spring 402 work together to damage the modular temperature compensation substrate 301.

[0038] The embodiment of the utility model provides a fiber Bragg grating displacement sensor with an anti-disassembly self-destructing cast shell. The working principle of the fiber Bragg grating displacement sensor with an anti-disassembly self-destructing cast shell is as follows: the inner fisheye bearing 211 is tightly connected to the object to be measured, and the inner fisheye bearing 211 is threadedly connected to the guide column 210. When the displacement changes, the guide column 210 drives the inclined block 205 to move linearly. Because the guide column 214 moves in the guide sleeve 105, and the inclined block 205 is installed on the slider 204 and is restricted by the slide rail 201, it performs precise linear motion to make the displacement transmission linear and accurate. The tension spring 208 applies a reaction force to the guide column 210 through the hanging plate 207, keeps the inner fisheye bearing 211 tightly connected to the object to be measured at all times, and greatly reduces the measurement error. The center line of the tension spring 208 is parallel to the center line of the guide column 210, and there is no dead point of motion blocking. The inclined block 205 moves on the slide rail 201, and the slide column 212 moves up and down on the inclined surface of the inclined block 205 along with the movement of the inclined block 205, and the movement of the inclined block 205 is linearly proportional to the movement of the slide column 212. The slide column 212 transmits the movement in proportion to the modular displacement spring piece 302, and the equal torsion beam of the modular displacement spring piece 302 undergoes uniform deflection deformation, driving the fiber grating solid-state packaged on the modular displacement spring piece 302 to produce deflection changes, so that the fiber grating wavelength changes regularly. After the sensor is processed, the displacement and temperature change are calibrated, and a fitting curve is generated. After installation, the starting wavelength and ambient temperature are recorded. The subsequent measurement can be substituted into the pseudo formula according to the measured value to obtain the displacement change, and there is no zero drift phenomenon.

[0039] All transmission and measurement components of the utility model are made of inorganic materials, and have the advantages of anti-electromagnetic interference, super long life, and long-term detection. The assembly connection grating detection involved in the utility model is a common means used by those skilled in the art, and technical inspiration can be obtained through limited tests, which belongs to common knowledge. The components not described in detail in this article are prior art.

[0040] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing, characterized in that: It comprises an anti-disassembly self-destruction housing (1), a displacement measurement transmission unit (2), a measurement unit (3) and a self-destruction device (4), wherein the displacement measurement transmission unit (2) and the measurement unit (3) are both installed on the anti-disassembly self-destruction housing (1); The anti-disassembly self-destruction housing (1) comprises a casting base (101), a cover plate (102), a pointed screw (103), a locking cap of an optical fiber protection tube (104), a guide sleeve (105), an expansion pin (106) and a tension ring (107); the casting base (101) is matched with the cover plate (102); the displacement measurement transmission unit (2) comprises a slide rail (201), a limit bolt group (202), a slide rail fixing bolt group (203), a slider (204), an inclined block (205), an inclined block fixing bolt (206), a hanging plate (207) and a plurality of movable members. ), a tension spring (208), a tension spring fixing bolt group (209), a guide column (210), an inner thread fisheye bearing (211), a sliding column (212), a sliding column limit screw (213), a guide block and a guide block fixing bolt (215); the measuring unit (3) comprises a modular temperature compensation substrate (301), a modular displacement spring (302), a fiber feed pressure plate (303) and a fiber feed pressure plate fixing bolt (304); the substrates of the modular temperature compensation substrate (301) and the modular displacement spring (302) are both made of inorganic elastic materials, and are both solid-state packaging methods; Wherein, a fiber inlet support plate (101-3) and a fiber outlet support plate (101-4) are respectively arranged on both sides of the upper part of the casting base (101), and the fiber inlet support plate (101-3) is used to install the modular temperature compensation substrate (301); the casting base (101) has a first threaded hole (101-1) on the fiber outlet end surface for installing the guide sleeve (105); a guide column (210) of the displacement measurement transmission unit (2) is slidably connected in the guide sleeve (105); the casting base (101) has a second threaded hole (101-2) on the fiber outlet end surface for installing the optical fiber protection tube locking cap (104); A first notch (101-5) is provided on the long side surface at the lower inner side of the casting base (101), third threaded holes (101-6) are provided at both ends of the first notch (101-5), and a plurality of fourth threaded holes (101-7) are provided in the middle of the first notch (101-5); a mounting through hole is provided on the slide rail (201), which is used to install a limiting bolt group (202), which passes through the third threaded hole (101-6) and the mounting through hole and is locked by a nut to fix the slide rail (201), and serves as a movable limiting structure of the slider (204); The fourth threaded hole (101-7) and the mounting through hole of the slide rail (201) are installed with a slide rail fixing bolt group (203) for fastening the slide rail (201); the slider (204) is installed on the upper side of the slide rail (201) and can flexibly move linearly; the inclined block fixing bolt (206) is used to fix the inclined block (205) on the two sliders (204); the top of the inclined block (205) is a wedge block, the top is an inclined surface, the bottom of the inclined block (205) is a rectangular parallelepiped and the bottom is provided with a first through hole (205-1), a strip inclined surface is arranged in the center of the rectangular parallelepiped, and a rectangular parallelepiped small block is arranged at the lower end of the inclined surface to open a fifth threaded hole (205-2), one end of the guide column (210) passes through the hanging plate (207) and is threadedly connected to the fifth threaded hole (205-2), and the other end of the guide column (210) passes through the guide sleeve (105) and is threadedly connected to the inner thread fisheye bearing (211).

2. The fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing according to claim 1, characterized in that: The bottom surface of the casting base (101) is provided with a square first groove (101-8), a first countersunk hole (101-9) is provided in the first groove (101-8), a guide block is tightly fitted in the first groove (101-8), a bolt (215) passes through the first countersunk hole (101-9) and is threadedly connected with a sixth threaded hole (214-1) provided on the short surface of the guide block; a second through hole (214-2) is provided on the long surface of the guide block; a seventh threaded hole (214-3) is provided on the long surface of the guide block perpendicular to the axis of the second through hole, for installing a slide column limit screw (213); the slide column (212) is slidably connected in the second through hole (214-2), and the upper and lower ends thereof are respectively in sliding contact with the modular displacement spring piece (302) of the measuring unit (3) and the inclined surface of the wedge block of the inclined block (205), so as to convert the displacement of the inner thread fisheye bearing (211) into the deformation of the modular displacement spring piece (302).

3. The fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing according to claim 2, characterized in that: The casting base (101) is provided with a twelfth threaded hole (101-14) on the fiber inlet side, and a tension spring fixing bolt group (209) is installed to fix one end of the tension spring (208); the other end of the tension spring (208) is hung on the hanging plate (207), and when the inner thread fisheye bearing (211) pulls the slider (204) to move through the guide column (210), the tension spring (208) is stretched, and when the external force on the inner thread fisheye bearing (211) is removed, the slider (204) is reset under the action of the tension spring (208).

4. The fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing according to claim 3, characterized in that: The casting base (101) is provided with a second notch (101-10) on the fiber inlet side of the upper side, and a ninth threaded hole (101-11) is provided in the second notch (101-10). The fiber inlet pressure plate fixing bolt (304) passes through the fiber inlet support plate (101-3), the modular displacement spring sheet (302), and the modular temperature compensation substrate (301) and engages with the ninth threaded hole (101-11). The end surface of the casting base (101) is provided with a second layer of inner large diameter outer A small-diameter two-layer inner cylindrical groove (101-12) is provided with a tenth threaded hole (101-13) at the bottom of the inner cylindrical groove (101-12) for installing a pointed screw (103). An expansion pin (106) passes through a columnar countersunk hole (102-1) provided on the cover plate (102) and passes through a tensioning ring (107). The expansion pin (106) contacts the pointed screw (103) and is pressed into the inner cylindrical groove (101-12) to fix the cover plate (102).

5. The fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing according to claim 4, characterized in that: The center lines of the slide rail (201), the slider (204), the inclined block (205), the inner thread fisheye bearing (211), the slide column (212), and the modular displacement spring piece (302) are coplanar.

6. The fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing according to claim 5, characterized in that: The self-destruct device (4) comprises a self-destruct screw (401) and a strong spring (402), wherein the strong spring (402) is inserted on the self-destruct screw (401).

7. The fiber Bragg grating displacement sensor with a disassembly-proof self-destructive casting housing according to claim 6, characterized in that: The cover plate (102) is provided with an eleventh threaded hole (102-2) for installing a self-destruct screw (401). A strong spring (402) is mounted on the self-destruct screw (401). When the cover plate (102) is separated from the casting base (101), or when the self-destruct screw (401) is removed and pulled out, the strong spring (402) takes effect, and the self-destruct screw (401) and the strong spring (402) work together to damage the modular temperature compensation substrate (301).

Images