Fiber optic single component seismic sensor

Abstract

A kind of optical fiber single-component pick-up sensor, including protective sleeve and pick-up frame arranged in its interior;Pick-up frame includes fixed rod and pre-tensioning assembly arranged in its middle part, and the outer end of fixed rod is fixed with pick-up block by spring piece;Pre-tensioning assembly includes movable block and fixed block arranged with gap along the length direction of fixed rod, fixed block is fixed with fixed rod, and adjusting screw capable of adjusting the spacing between movable block and fixed block is arranged between movable block and fixed block;Spring piece is provided with connecting block, and detection grating is fixed between connecting block and movable block;After being fixed, optical fiber grating can be adjusted by rotating adjusting screw, to adjust the spacing between movable block and fixed block, and then adjust the initial state of optical fiber grating between movable block and connecting block, the vibration of pick-up block can be fed back to connecting block through spring piece, and then drive optical fiber grating to deform, realize vibration detection, effectively ensure the accuracy of detection result.

Description

Technical Field

[0001] This utility model relates to the field of seismic sensor technology, specifically to an optical fiber single-component seismic sensor. Background Technology

[0002] Vibration sensors are devices that convert mechanical vibrations into measurable electrical signals through electromechanical conversion. They mainly use a detection grating placed between a vibrating block and a fixed block. When the vibrating block vibrates, the deformation of the detection grating is used to feed back the amount of vibration, thus achieving vibration detection. However, in existing vibration sensors, the detection grating is usually directly fixed between the vibrating block and the fixed block. The origin of the detection parameters is then determined based on the initial deformation (initial state) of the fiber optic grating, which results in a large error in the detection process. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model provides an optical fiber single-component seismic sensor.

[0004] The technical solution of this utility model is as follows:

[0005] A fiber optic single-component vibration sensor includes a protective sleeve and a vibration pickup frame disposed inside it. The vibration pickup frame is equipped with a detection grating, and vibration detection can be achieved through the cooperation of the vibration pickup frame and the detection grating.

[0006] As the core technical concept of this utility model, the vibration pickup frame includes a fixed rod and a pre-tensioning assembly located in its middle. The outer end of the fixed rod is fixed with a vibration pickup block via a spring. The vibration pickup block can sense vibration and transmit it to the spring. The pre-tensioning assembly includes a movable block and a fixed block spaced apart along the length of the fixed rod. The fixed block is fixed to the fixed rod, and an adjusting screw is provided between the fixed block and the movable block to adjust the distance between the movable block and the fixed block. A connecting block is provided on the spring. A detection grating is fixed between the connecting block and the movable block. Based on the above structure, after the fiber grating is fixed, the distance between the movable block and the fixed block can be adjusted by rotating the adjusting screw, thereby adjusting the initial state of the fiber grating between the movable block and the connecting block. The vibration of the vibration pickup block can be fed back to the connecting block through the spring, thereby causing the fiber grating to deform and realizing vibration detection, effectively ensuring the accuracy of the detection results.

[0007] As described above, in a preferred embodiment, the movable block has a strip hole along the length of the fixed rod that can be fixed with the bolt of the fixed rod. After adjusting the initial state of the fiber grating by adjusting the screw, the movable block can be fixed to the fixed rod through the strip hole, ensuring the stability of the relative position of the fixed block and further ensuring the accuracy of the vibration detection results through the fiber grating.

[0008] As a further preferred embodiment, in order to facilitate the stable adjustment of the distance between the movable block and the fixed block by adjusting the screw, the movable block is located on the side of the fixed block closer to the vibration pickup block, one end of the adjusting screw passes through the movable block and is screwed to the fixed block, and the other end is provided with an adjusting head that fits against the side of the movable block away from the fixed block.

[0009] As described above, for the purpose of facilitating signal transmission of the fiber optic single-component seismic sensor, the protective sleeve includes a main housing and a sealing cap at one end. The end of the fixing rod facing away from the seismic sensor block is fixed to the sealing cap. A waterproof connector for connecting to the detection grating is provided on the outside of the sealing cap.

[0010] As a preferred embodiment, in order to ensure the stability of the connection between the waterproof connector and the sealing cap, and thus ensure the stability of signal transmission, the waterproof connector and the sealing cap are inserted into each other.

[0011] As described above, for the fiber optic single-component vibration sensor, in order to facilitate the fixing of the vibration sensor and thus ensure the accuracy of its vibration detection, the outer ring of the protective sleeve is also provided with several springs that can fix it in the drill hole.

[0012] In a preferred embodiment, to facilitate the insertion and fixing of the vibration sensor into the borehole, the spring is a strip structure arranged along the axial direction of the protective sleeve, with its middle part fixed to the protective sleeve and the end near the vibration sensor block bent, and the angle between the bent part and the middle part of the spring is acute.

[0013] The beneficial effects of this utility model are as follows: This utility model is a fiber optic single-component vibration sensor. After the fiber optic grating is fixed, the distance between the movable block and the fixed block can be adjusted by rotating the adjusting screw, thereby adjusting the initial state of the fiber optic grating between the movable block and the connecting block. The vibration of the vibration-sensing block can be fed back to the connecting block through the spring, thereby driving the fiber optic grating to deform and realize vibration detection, effectively ensuring the accuracy of the detection results. Attached Figure Description

[0014] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the vibration pickup frame in the embodiment;

[0017] Figure 2 This is a schematic diagram of the overall structure of the vibration sensor in the embodiment;

[0018] The components represented by the various reference numerals in the diagram are:

[0019] 1. Protective sleeve; 11. Main housing; 12. Sealing cover; 13. Top screw; 2. Vibration pickup frame; 21. Fixing rod; 22. Pre-tensioning assembly; 221. Fixing block; 222. Movable block; 223. Adjusting screw; 23. Spring; 24. Vibration pickup block; 25. Connecting block; 3. Detection grating; 4. Waterproof connector; 5. Spring. Detailed Implementation

[0020] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0021] Example

[0022] This embodiment provides a fiber optic single-component seismic sensor; see [link to documentation]. Figure 1 and Figure 2 It includes a protective sleeve 1 and a vibration pickup frame 2 disposed inside it. The vibration pickup frame 2 is provided with a detection grating 3. Through the cooperation of the vibration pickup frame 2 and the detection grating 3, vibration detection can be realized. The structure of the vibration pickup sensor (the above-mentioned fiber optic single-component vibration pickup sensor) is described in detail below.

[0023] In this embodiment, the protective sleeve 1 includes a cylindrical main housing 11 with one end open. The open end of the main housing 11 is provided with a sealing cap 12. To facilitate the signal transmission of the vibration sensor, a waterproof connector 4 connected to the detection grating 3 is provided on the outside of the sealing cap 12. Specifically, the sealing cap 12 is provided with a socket for communication connection with the detection grating 3 inside the protective sleeve 1. Through the insertion and cooperation of the waterproof connector 4 and the socket, communication connection with the detection grating 3 can be realized. The specific connection method is an existing and mature technology, which will not be elaborated further here.

[0024] As a preferred embodiment of this invention, in order to ensure the stability of the connection between the waterproof connector 4 and the sealing cover 12, and thus ensure the stability of signal transmission, the waterproof connector 4 and the sealing cover 12 are inserted into each other.

[0025] Furthermore, in order to better match the sensor installation fixture when installing the vibration sensor of this application, the sealing cover 12 is provided with a set screw 13.

[0026] In this embodiment, in order to facilitate the fixing of the vibration sensor and thus ensure the accuracy of its vibration detection, the outer ring of the main housing 11 of the protective sleeve 1 is also provided with several spring pieces 5 that can fix it in the drill hole.

[0027] As a preferred embodiment of this invention, in order to facilitate the insertion and fixing of the vibration sensor in the borehole, the spring 5 is a strip structure arranged along the axial direction of the protective sleeve 1, with its middle part fixed to the protective sleeve 1, and the end near the vibration sensor 24 bent, and the angle between the bent part and the middle part of the spring 5 is an acute angle.

[0028] As a further preferred embodiment, in order to ensure that the vibration sensor can be smoothly inserted and fixed in the borehole, while also being easy to remove and test and calibrate, the outer end of the bent portion of the spring 5 (the end away from the middle of the spring 5) is bent toward the middle of the spring 5, that is, the outer end of the bent portion of the spring 5 is tilted inward toward the middle of the spring 5.

[0029] Preferably, to further ensure the fixation effect of the vibration sensor under the action of the reed 5, both ends of the reed 5 adopt the above-mentioned bending structure.

[0030] In this embodiment, as the core technical concept of this utility model, the vibration pickup frame 2 includes a fixed rod 21 and a pre-tensioning assembly 22 disposed in its middle. The outer end of the fixed rod 21 is fixed with a vibration pickup block 24 by a spring piece 23, and the inner end (i.e., the end of the fixed rod 21 away from the vibration pickup block 24) is fixed to the inner side of the sealing cover 12. The vibration pickup block 24 can sense vibration and transmit the vibration to the spring piece 23. The pre-tensioning assembly 22 includes a movable block 222 and a fixed block 221 that are spaced apart along the length of the fixed rod 21. The fixed block 221 is fixed to the fixed rod, and there is an adjustable movable block 222 between it and the movable block 222. The adjustable screw 223 between the movable block 222 and the fixed block 221 is provided. The spring piece 23 is provided with a connecting block 25. The detection grating 3 is fixed between the connecting block 25 and the movable block 222. Based on the above structure, after the fiber grating is fixed, the distance between the movable block 222 and the fixed block 221 can be adjusted by rotating the adjusting screw 223, thereby adjusting the initial state of the fiber grating between the movable block 222 and the connecting block 25. The vibration of the vibration pickup block 24 can be fed back to the connecting block 25 through the spring piece 23, thereby driving the fiber grating to deform and realize vibration detection, effectively ensuring the accuracy of the detection results.

[0031] Furthermore, the sealing cover 12 is also provided with an oil injection hole that connects to the interior of the main housing 11. Silicone oil can be injected into the interior of the housing through the oil injection hole to remove the resonance peak of the vibration sensor and further ensure the accuracy of the vibration sensor detection results.

[0032] As a preferred embodiment of this invention, the movable block 222 is provided with a strip-shaped hole along the length direction of the fixed rod 21, which can be fixed with the fixed rod 21 by bolt. After the initial state of the fiber optic grating is adjusted by adjusting the screw 223, the movable block 222 can be fixed to the fixed rod 21 through the strip-shaped hole, ensuring the stability of the relative position of the fixed block 221, and further ensuring the accuracy of the vibration detection results through the fiber optic grating.

[0033] As a further preferred embodiment, in order to facilitate the stable adjustment of the distance between the movable block 222 and the fixed block 221 by adjusting the screw 223, the movable block 222 is located on the side of the fixed block 221 close to the vibration pickup block 24, one end of the adjusting screw 223 passes through the movable block 222 and is spirally connected to the fixed block 221, and the other end is provided with an adjusting head that fits against the side of the movable block 222 away from the fixed block 221.

[0034] Preferably, in order to better transmit the vibration of the vibration-collecting block 24 to the spring 23, the spring 23 is provided with a hollow hole in the middle.

Claims

1. A fiber optic single-component seismic sensor, characterized in that, Includes a protective sleeve (1) and a vibration pickup frame (2) installed inside it; The vibration pickup frame (2) includes a fixed rod (21) and a pre-tensioning component (22) located in the middle. The outer end of the fixed rod (21) is fixed with a vibration pickup block (24) by a spring piece (23). The pre-tensioning assembly (22) includes a movable block (222) and a fixed block (221) with a gap along the length of the fixed rod (21). The fixed block (221) is fixed to the fixed rod, and an adjusting screw (223) is provided between the fixed block (222) and the movable block (222) to adjust the distance between the movable block (222) and the fixed block (221). The spring sheet (23) is provided with a connecting block (25), and a detection grating (3) is fixed between the connecting block (25) and the movable block (222).

2. The fiber optic single-component seismic sensor according to claim 1, characterized in that, The movable block (222) has a strip hole along the length of the fixed rod (21) that can be bolted to the fixed rod (21).

3. The fiber optic single-component seismic sensor according to claim 1, characterized in that, The movable block (222) is located on the side of the fixed block (221) near the vibration pickup block (24); One end of the adjusting screw (223) passes through the movable block (222) and is spirally connected to the fixed block (221), and the other end is provided with an adjusting head that fits against the side of the movable block (222) away from the fixed block (221).

4. A fiber optic single-component seismic sensor according to any one of claims 1-3, characterized in that, The protective sleeve (1) includes a main housing (11) and a sealing cap (12) at one end. The fixed rod (21) is fixed to the sealing cap (12) at the end away from the vibration pickup block (24). The sealing cover (12) is provided with a waterproof connector (4) on the outside of which is connected to the detection grating (3).

5. A fiber optic single-component seismic sensor according to claim 4, characterized in that, The waterproof connector (4) is inserted into the sealing cap (12).

6. A fiber optic single-component seismic sensor according to any one of claims 1-3, characterized in that, The outer ring of the protective sleeve (1) is also provided with several springs (5) that can fix it in the drill hole.

7. A fiber optic single-component seismic sensor according to claim 6, characterized in that, The spring (5) is a strip structure arranged along the axial direction of the protective sleeve (1). Its middle part is fixed to the protective sleeve (1), and the end near the vibration pickup block is bent. The angle between the bent part and the middle part of the spring (5) is acute.

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