Passive optical fiber vibration sensor

Abstract

The utility model relates to a passive optical fiber vibration sensor, which comprises a shell, an elastic element positioned in the shell, a grating fixing frame connected with the shell through the elastic element, a vibration measurement grating connected with the grating fixing frame, and a first lead and a second lead which are connected with the vibration measurement grating and extend to the outer side of the shell in a sealing manner. When the vibration measuring device is used, vibration is transmitted to the elastic element through the shell, then the elastic element transmits the vibration to the grating fixing frame, signals are transmitted through the vibration measuring grating, vibration measurement is achieved, and compared with a structure using a connecting rod and a rotating shaft, the vibration measuring device is simple in structure and convenient to install.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber, and more particularly to the field of vibration sensor technology, specifically referring to a passive optical fiber vibration sensor. Background Technology

[0002] Fiber optic passive sensing technology has been widely used in various fields due to its advantages such as being unaffected by electromagnetic interference, requiring no power supply on site, having good long-term reliability and stability, and long transmission distance.

[0003] Some universities and enterprises in China have already conducted research on fiber optic grating vibration sensors or fiber optic accelerometers. Chinese invention patent application number CN201410068353.5 discloses a fiber optic grating vibration sensor, which includes a support housing, a linkage mechanism, an elastic element, and an overload protection device. The linkage mechanism includes a first link, a second link, a third link, a first fixed shaft, a first movable shaft, a second movable shaft, and a second fixed shaft. Through the transmission of the second link, the oscillation of the third link in the direction perpendicular to the fiber optic grating can be effectively converted into the oscillation of the first link in the direction parallel to the fiber optic grating, effectively avoiding shear force in the lateral direction of the fiber optic grating and improving the reliability and stability of the sensor. However, this structure is complex and inconvenient to install. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a passive fiber optic vibration sensor with a simple structure and easy installation.

[0005] This utility model is achieved through the following technical solution: a passive fiber optic vibration sensor, including a housing, an elastic element located inside the housing, a grating fixing frame connected to the housing through the elastic element, and a vibration measuring grating connected to the grating fixing frame, with a first wire and a second wire connected to the vibration measuring grating extending in a sealed manner to the outside of the housing.

[0006] In use, the vibration is transmitted through the housing to the elastic element, which then transmits the vibration to the grating holder. The vibration is then transmitted through the vibration grating, thus enabling the measurement of the vibration. Compared with structures using connecting rods and rotating shafts, this design is simpler and easier to install.

[0007] Preferably, the grating holder is located between the two elastic elements, with one end of the elastic element in contact with the grating holder and the other end connected to the inner wall of the housing.

[0008] This preferred solution uses two elastic elements to transmit vibrations while simultaneously providing a fixed support for the grating frame.

[0009] Preferably, a counterweight is also fixed to the bottom surface of the grating holder. This preferred embodiment prevents the grating holder from rotating by using the counterweight.

[0010] Preferably, the grating holder is provided with a first guide rod to guide the elastic deformation of the elastic element. This preferred embodiment uses the first guide rod to guide the elastic element.

[0011] Preferably, a positioning seat is provided on the inner sidewall where the housing connects to the elastic element. The positioning seat is provided with a positioning protrusion that guides the elastic deformation of the elastic element. The positioning seat is also provided with a positioning protrusion that is inserted into the inner sidewall.

[0012] This preferred solution uses positioning bumps to position the positioning seat, and uses positioning protrusions to position the positioning elastic element.

[0013] Preferably, both the first and second conductors are connected to fiber optic quick-connect connectors located on the outside of the housing.

[0014] This preferred solution facilitates quick-connection of the first and second wires with other wires by using fiber optic quick-connect connectors.

[0015] Preferably, the housing is placed inside the box, and two side ears are connected to the bottom surface of the housing. The side ears are connected to the box by bolts, and the box has through holes for the first wire and the second wire to pass through.

[0016] This preferred solution uses a box design to protect the outer shell, and the side ears facilitate the connection between the outer shell and the box.

[0017] The beneficial effects of this utility model are as follows: vibration is transmitted to the elastic element through the shell, and the elastic element then transmits the vibration to the grating fixing frame, thereby transmitting the signal through the vibration measuring grating and realizing the measurement of vibration. Compared with the structure using connecting rods and rotating shafts, this solution has a simple structure and is easy to install; the setting of two elastic elements transmits vibration while also fixing and supporting the grating fixing frame; the setting of positioning protrusions positions the positioning seat, and the setting of positioning protrusions positions the positioning elastic element. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-section of the shell;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a top view of the shell.

[0021] Figure 4 This is a top-down view of the main body;

[0022] As shown in the figure:

[0023] 1. Housing, 2. Positioning seat, 3. Elastic element, 4. Vibration grating, 5. Grating fixing frame, 6. Counterweight, 7. Fiber optic quick connector. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0025] See attached document Figure 1-3 This utility model discloses a passive fiber optic vibration sensor, which includes a housing, comprising a main body and a cover connected to the upper end of the main body. The main body has a shell 1 inside, and two side ears are connected to the bottom surface of the shell 1. The side ears are connected to the housing by bolts.

[0026] The housing 1 also includes an elastic element 3 located inside the housing 1, a grating fixing frame 5 connected to the housing 1 through the elastic element 3, and a vibration measuring grating 4 located inside the grating fixing frame 5. The vibration measuring grating is installed inside the grating fixing frame, and both ends of the vibration measuring grating are fixedly connected to the grating fixing frame. The elastic element 3 includes a spring.

[0027] The grating holder 5 is located between the two springs, and the two springs are symmetrically arranged about the grating holder 5. One end of the spring is in contact with the grating holder 5, and the other end is connected to the inner side wall of the housing 1.

[0028] A counterweight 6 is also fixed to the bottom surface of the grating fixing frame 5. The grating fixing frame 5 is provided with a first guide rod that provides elastic deformation of the spring for guidance. That is, the first guide rod is inserted into the spring along the extension direction of the spring.

[0029] The inner wall of the housing 1 connected to the spring is provided with a positioning seat 2. The positioning seat 2 is provided with a positioning protrusion that guides the elastic deformation of the spring. That is, the positioning protrusion is inserted into the spring along the extension direction of the spring. The positioning seat 2 is provided with a positioning protrusion that is inserted into the inner wall. The inner wall is provided with a positioning groove for the positioning protrusion to be inserted.

[0030] The first and second wires connected to the vibration grating 4 extend to the outside of the housing 1 in a sealed manner. The housing has a through hole for the first and second wires to pass through. Both the first and second wires are connected to fiber optic quick-connect connectors 7 located on the outside of the housing.

[0031] In use, the vibration is transmitted through the housing 1 to the elastic element 3, which then transmits the vibration to the grating fixing frame 5. The signal is then transmitted through the vibration measuring grating 4, thereby achieving vibration measurement. Compared with structures using connecting rods and rotating shafts, this solution is simpler and easier to install. The two elastic elements 3 transmit the vibration while also providing fixed support for the grating fixing frame 5. The positioning protrusions position the positioning seat 2, and the positioning protrusions position the positioning elastic element 3.

[0032] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A passive fiber optic vibration sensor, comprising a housing (1), characterized in that: It also includes an elastic element (3) located inside the housing (1), a grating holder (5) connected to the housing (1) through the elastic element (3), and a vibration measuring grating (4) connected to the grating holder (5). The first and second wires connected to the vibration measuring grating (4) extend to the outside of the housing (1).

2. The passive fiber optic vibration sensor according to claim 1, characterized in that: The grating holder (5) is located between the two elastic elements (3). One end of the elastic element (3) is in contact with the grating holder (5), and the other end is connected to the inner wall of the housing (1).

3. The passive fiber optic vibration sensor according to claim 2, characterized in that: A counterweight (6) is also fixed to the bottom surface of the grating fixing frame (5).

4. The passive fiber optic vibration sensor according to claim 2, characterized in that: The grating holder (5) is provided with a first guide rod that provides guidance for the elastic deformation of the elastic element (3).

5. The passive fiber optic vibration sensor according to claim 2, characterized in that: The inner wall of the housing (1) connected to the elastic element (3) is provided with a positioning seat (2). The positioning seat (2) is provided with a positioning protrusion that guides the elastic deformation of the elastic element (3). The positioning seat (2) is provided with a positioning protrusion that is inserted into the inner wall.

6. The passive fiber optic vibration sensor according to claim 1, characterized in that: Both the first and second conductors are connected to fiber optic quick-connect connectors (7) located outside the housing (1).

7. The passive fiber optic vibration sensor according to claim 1, characterized in that: The housing (1) is placed inside the box. Two side ears are connected to the bottom surface of the housing (1). The side ears are connected to the box by bolts. The box has through holes for the first wire and the second wire to pass through.

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