High-precision strain measurement fiber bragg grating sensor

Abstract

The utility model belongs to the technical field of optical fiber sensing, and particularly relates to a high-precision strain measurement fiber bragg grating sensor, which comprises an optical fiber cable, a fiber bragg grating sensor probe, a fiber bragg grating demodulator transmission line, a connector I and the like, one end of the optical fiber cable is provided with a fiber grating sensor probe, and the other end is fixedly connected with a first connector. Through the cooperation of the gear, the knob, the turntable and the gear ring, the synchronous locking of a plurality of locking screws can be achieved, the connection efficiency of the optical fiber cable and the transmission line of the fiber bragg grating demodulator is improved, meanwhile, the gear and the gear ring have unique self-locking characteristics, and after the locking operation is completed, as long as no external force drives the knob to rotate reversely, the locking screw can be locked. Therefore, the system can automatically maintain the locking state, thereby effectively preventing the locking screw from loosening caused by vibration, accidental touch and other factors, and providing a solid guarantee for the stability and reliability of the connection between the optical fiber line and the transmission line of the fiber bragg grating demodulator.

Description

Technical Field

[0001] This utility model belongs to the field of fiber optic sensing technology, and in particular relates to a high-precision strain measurement fiber optic grating sensor. Background Technology

[0002] A high-precision strain measurement fiber Bragg grating sensor is a precision measuring device based on fiber optic sensing technology, primarily used for real-time and accurate monitoring of strain changes in objects or engineering structures. The core component of this sensor is the fiber Bragg grating, which achieves selective reflection of specific wavelength light signals by using a special process to form a periodic refractive index modulation structure within the fiber core.

[0003] High-precision strain measurement fiber Bragg grating sensors typically consist of an optical fiber integrating a fiber Bragg grating sensor probe and a fiber Bragg grating demodulator transmission line. However, in practical applications, the connection between these two cables often requires multiple screws and nuts for fixing. The traditional connection method involves tightening each screw individually, which is not only cumbersome and inefficient but also makes it difficult to ensure uniform stress at each connection point, affecting the overall stability of the connection. Moreover, the screws are prone to loosening during equipment operation due to vibration, environmental changes, and other factors. Once the screws loosen, it can lead to unstable signal transmission at the fiber optic connection and may even cause serious problems such as connection failure.

[0004] Therefore, it is necessary to design a high-precision strain measurement fiber Bragg grating sensor to solve the above-mentioned technical problems. Utility Model Content

[0005] To overcome the shortcomings of traditional screw tightening methods, such as cumbersome operation, low efficiency, uneven force distribution, and easy loosening of screws, which affect signal transmission and connection stability, this utility model provides a high-precision strain measurement fiber optic grating sensor.

[0006] This utility model is achieved through the following technical approach: A high-precision strain measurement fiber Bragg grating sensor includes an optical fiber, a fiber Bragg grating sensor probe, a fiber Bragg grating demodulator transmission line, a first connector, a second connector, a locking screw, and a locking nut. The optical fiber and the fiber Bragg grating demodulator transmission line are distributed left and right. A fiber Bragg grating sensor probe is installed at one end of the optical fiber, and the first connector is fixedly connected to the other end. A second connector is fixedly connected to one end of the fiber Bragg grating demodulator transmission line, and the second connector contacts the first connector. The first connector has a uniformly spaced section along one side of its axis. The connector has multiple through holes, each with a locking screw that slides into it. These locking screws are simultaneously inserted into multiple pre-drilled holes on the connector. The connector has multiple locking nuts arranged in a circular array on it. The number of locking nuts is the same as the number of locking screws, and they are threaded together one by one. The connector also includes gears, knobs, a turntable, and a gear ring. Each locking nut has a gear fixed to its outer ring. The knob is mounted on the connector and has a turntable fixed to one end. The gear ring is fixed to the outer ring of the turntable, and multiple gears mesh with it around the gear ring.

[0007] Optionally, it also includes locking rods and return springs. Multiple positioning holes are evenly distributed on the turntable with the center of the knob as the reference. Multiple locking rods are arranged in a ring array and slidably disposed on the connector two and inserted into the corresponding positioning holes. Each locking rod is fixedly connected to the connector two with a return spring.

[0008] Optionally, it also includes a bend preventer, with a bend preventer fixed to both the fiber optic cable and the fiber optic demodulator transmission line.

[0009] Optionally, a non-slip layer is provided on the surface of the outer ring of the knob.

[0010] Optionally, one end of each clamp rod inserted into the positioning hole adopts a semi-circular structure.

[0011] Optionally, each bend surface is provided with multiple arc-shaped grooves.

[0012] Beneficial effects: 1. Through the cooperation of gears, knobs, turntables and gear rings, multiple locking screws can be locked synchronously, improving the connection efficiency between the optical fiber and the fiber Bragg grating demodulator transmission line. At the same time, the gears and gear rings have a unique self-locking characteristic. After the locking operation is completed, as long as there is no external force driving the knob to rotate in the opposite direction, the system can automatically maintain the locked state, effectively preventing the locking screws from loosening due to vibration, accidental contact and other factors, providing a solid guarantee for the stability and reliability of the connection between the optical fiber and the fiber Bragg grating demodulator transmission line.

[0013] 2. The design of the locking lever and return spring can quickly fix the position of the turntable after it stops rotating, preventing the turntable from rotating on its own and ensuring a stable and reliable connection between connector one and connector two, avoiding signal transmission problems caused by loose connections. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the connector one, connector two, and locking screw components of this utility model.

[0016] Figure 3 This is a partial cross-sectional view of connector one and connector two components of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the connector, locking screw, and through hole components of this utility model.

[0018] Figure 5 This is a three-dimensional structural diagram of the positioning hole, locking rod, and reset spring of this utility model.

[0019] In the diagram: 1. Fiber optic cable; 101. Fiber Bragg grating sensor probe; 2. Fiber Bragg grating demodulator transmission line; 3. Connector 1; 4. Connector 2; 5. Locking screw; 6. Through hole; 7. Locking nut; 8. Gear; 9. Knob; 10. Turntable; 11. Gear ring; 12. Positioning hole; 13. Locking rod; 14. Return spring; 15. Anti-bend head. Detailed Implementation

[0020] Example: A high-precision strain measurement fiber Bragg grating sensor, such as... Figures 1-5As shown, the device includes an optical fiber cable 1, a fiber Bragg grating sensor probe 101, a fiber Bragg grating demodulator transmission line 2, a first connector 3, a second connector 4, locking screws 5, locking nuts 7, and an anti-bend head 15. The optical fiber cable 1 and the fiber Bragg grating demodulator transmission line 2 are arranged side-by-side. The fiber Bragg grating sensor probe 101 is located at the left end of the optical fiber cable 1, and the first connector 3 is attached to the right end. The second connector 4 is attached to the left end of the fiber Bragg grating demodulator transmission line 2, and the second connector 4 is in contact with the first connector 3. The first connector 3 has four through holes 6 evenly distributed along its right side axis. A locking screw 5 is slidably inserted into each through hole 6. The four locking screws 5 are simultaneously inserted into the four pre-drilled holes on the second connector 4. The second connector 4 has four locking nuts 7 arranged in a circular array. The number of locking nuts 7 and locking screws 5 are the same, and they are connected one-to-one by thread. An anti-bend head 15 is glued to both the fiber optic cable 1 and the fiber optic demodulator transmission line 2 to prevent the fiber optic cable 1 or the fiber optic demodulator transmission line 2 from bending excessively. Each anti-bend head 15 has multiple arc-shaped grooves on its surface, which helps to further disperse the stress on the fiber optic cable 1 or the fiber optic demodulator transmission line 2. It also includes gears 8, knobs 9, turntables 10 and gear rings 11. A gear 8 is glued to the outer ring of each locking nut 7. The knob 9 is rotatably mounted on the connector 4, and the turntable 10 is glued to its left end. The outer ring of the knob 9 has a ring of anti-slip layer to facilitate the operator to rotate the knob 9 and prevent slippage. The gear ring 11 is glued to the outer ring of the turntable 10, and four gears 8 are meshed around the gear ring 11.

[0021] like Figure 5 As shown, it also includes a locking rod 13 and a return spring 14. Multiple positioning holes 12 are evenly distributed on the turntable 10 with the center of the knob 9 as the reference. Three locking rods 13 are arranged in a ring array and slidably disposed on the connector 2 4 and inserted into the corresponding positioning holes 12. Through this insertion method, the turntable 10 is fixed on the connector 2 4. The right end of each locking rod 13 inserted into the positioning hole 12 adopts a semi-circular structure. When the locking rod 13 slides and inserts into the positioning hole 12, the semi-circular structure is aligned with the edge of the positioning hole 12, reducing the direct contact area between the locking rod 13 and the positioning hole 12, reducing frictional resistance, ensuring that the locking rod 13 smoothly enters the positioning hole 12, and avoiding jamming. A return spring 14 is bonded between each locking rod 13 and the connector 2 4 to provide a reset force for the locking rod 13.

[0022] When it is necessary to connect fiber optic cable 1 to fiber optic demodulator transmission line 2, the operator first aligns connector 1 3 with connector 2 4, ensuring that the external thread on the surface of the locking screw 5 contacts the locking nut 7. Then, the operator presses the locking screw 5 to fix its position in the through hole 6, and rotates the knob 9 clockwise, causing the turntable 10 to drive the gear ring 11 to rotate clockwise. The gear ring 11 meshes with the gear 8, driving the gear 8 to rotate counterclockwise, which in turn drives the locking nut 7 to rotate counterclockwise. The rotation of the locking nut 7 causes the locking screw 5 to move to the right, gradually entering the locking nut 7, until connector 1 3 moves to the right along with the locking screw 5 and contacts connector 2 4. Then, the operator stops rotating the knob 9, thus achieving a reliable connection between fiber optic cable 1 and fiber optic demodulator transmission line 2.

[0023] During the rotation of the turntable 10, the locking rod 13 is squeezed from the left side of the turntable 10 and disengages from the original positioning hole 12, sliding into the connector 4. At the same time, it compresses the return spring 14. When the turntable 10 stops rotating, the return spring 14 quickly returns to its original state, causing the locking rod 13 to pop out from the connector 4 and insert into the corresponding positioning hole 12, thereby fixing the position of the turntable 10 and preventing the turntable 10 from rotating on its own under accidental contact or external force, ensuring a stable connection.

Claims

1. A high-precision strain measurement fiber Bragg grating sensor, comprising an optical fiber (1), a fiber Bragg grating sensor probe (101), a fiber Bragg grating demodulator transmission line (2), a connector (3), a connector (4), a locking screw (5), and a locking nut (7). The optical fiber (1) and the fiber Bragg grating demodulator transmission line (2) are arranged side to side. One end of the optical fiber (1) is provided with the fiber Bragg grating sensor probe (101), and the other end is fixedly connected to the connector (3). One end of the fiber Bragg grating demodulator transmission line (2) is fixedly connected to the connector (4). Connector 2 (4) is in contact with connector 1 (3). Connector 1 (3) has multiple through holes (6) evenly distributed along one side axis. A locking screw (5) is slidably inserted into each through hole (6). Multiple locking screws (5) are simultaneously inserted into multiple pre-reserved round holes on connector 2 (4). Connector 2 (4) is rotatably provided with multiple locking nuts (7) arranged in a circular array. The number of locking nuts (7) is the same as that of locking screws (5), and they are threadedly connected one-to-one. It also includes gears (8), knobs (9), turntables (10) and gear rings (11). A gear (8) is fixed to the outer ring of each locking nut (7). The knob (9) is rotatably mounted on the connector (4), with a turntable (10) fixed to one end. The gear ring (11) is fixed to the outer ring of the turntable (10), and multiple gears (8) surround the gear ring (11) and mesh with it.

2. The high-precision strain measurement fiber grating sensor according to claim 1, characterized in that, It also includes a locking rod (13) and a return spring (14). Multiple positioning holes (12) are evenly distributed on the turntable (10) with the center of the knob (9) as the reference. Multiple locking rods (13) are arranged in a ring array and slidably disposed on the connector two (4) and inserted into the corresponding positioning holes (12). Each locking rod (13) is fixedly connected to the connector two (4) with a return spring (14).

3. The high-precision strain measurement fiber grating sensor according to claim 2, characterized in that, It also includes a bend preventer (15), and a bend preventer (15) is fixedly connected to both the fiber optic line (1) and the fiber optic demodulator transmission line (2).

4. The high-precision strain measurement fiber grating sensor according to claim 3, characterized in that, A non-slip layer is provided on the surface of the outer ring of the knob (9).

5. The high-precision strain measurement fiber grating sensor according to claim 4, characterized in that, The end of each clamp (13) inserted into the positioning hole (12) adopts a semi-circular structure.

6. The high-precision strain measurement fiber grating sensor according to claim 5, characterized in that, Each anti-bend (15) has multiple arc-shaped grooves on its surface.

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