Fiber bragg grating inclination angle measuring device

Abstract

The utility model relates to a fiber bragg grating dip angle measuring device which comprises a shell, a supporting rod is installed in the shell, the tail end of the supporting rod is hinged to a connecting rod through a universal joint, the other end of the connecting rod is fixedly connected with a copper ball, a connecting component is fixedly arranged on the copper ball, and the connecting component is connected with the shell. The connecting member and the connecting rod are symmetrically arranged relative to the copper ball center; the other end of the connecting component is fixedly connected with a pressing ball, a semicircular fiber bragg grating body is further arranged in the shell, the fiber bragg grating body is arranged below the pressing ball, the fiber bragg grating body deforms through the pressure of the pressing ball, the inclination angle is speculated, the inclination angle in any direction can be measured, and the measurement precision is high.

Description

Technical Field

[0001] The utility model relates to a fiber grating inclination measuring device, belonging to the technical field of fiber grating sensing. Background Art

[0002] Inclination is one of the most important and basic physical quantities that needs to be monitored in various fields. It plays a vital role in the completion of various projects. With the continuous development of production and science, inclination measurement is increasingly widely used in industrial research, water conservancy projects, construction and other fields. It plays an extremely important role in the safety status and monitoring and maintenance of many large-scale mechanical equipment or building facilities.

[0003] Chinese patent number CN212340236U discloses a gravity-type fiber Bragg grating (FBG) tilt sensor. The gravity-type fiber Bragg grating (FBG) tilt sensor consists of a protective housing, a pagoda joint, a plug, a copper ball, and a steel tube. The pagoda joint is connected to the top of the protective housing, and the plug is installed at the bottom. The protective housing houses the copper ball. The grating is encapsulated in the steel tube and connected to the copper ball, so that the grating bears the entire weight of the copper ball. When the FBG tilt sensor tilts, the gravitational component of the copper ball changes, and the pulling force of the FBG on the copper ball changes, thereby measuring the change in the building's tilt. However, when the FBG tilt sensor tilts, the accuracy of measuring the building's tilt change is low, and the error is large. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model provides a fiber Bragg grating inclination angle measuring device, which can measure the inclination angle in any direction with high measurement accuracy.

[0005] The technical solution of the utility model is as follows:

[0006] A fiber Bragg grating inclination angle measuring device includes a shell, a support rod is installed inside the shell, the end of the support rod is hinged to a connecting rod through a universal joint, the other end of the connecting rod is fixedly connected to a copper ball, and a connecting member is fixedly provided on the copper ball, and the connecting member and the connecting rod are symmetrically arranged relative to the center of the copper ball; the other end of the connecting member is fixedly connected to a pressing ball, and a semicircular fiber Bragg grating body is also arranged inside the shell, and the fiber Bragg grating body is arranged below the pressing ball, and the pressure of the pressing ball causes the fiber Bragg grating body to deform to infer the inclination angle.

[0007] The connecting component includes a sleeve fixed on the copper ball, a sliding rod is slidably connected to the inside of the sleeve through a spring, and the other end of the sliding rod is fixedly connected to the surface of the pressing ball.

[0008] A circular slide is provided through the wall of the shell, and the support rod is slidably connected to the circular slide; a synchronization rod is also provided on the fiber grating body, and the synchronization rod is slidably connected to the circular slide; a driving rod is provided between the support rod and the synchronization rod.

[0009] Wherein, a temperature compensator is also provided inside the shell.

[0010] It also includes an adjusting column, which is used to limit the deflection amplitude of the copper ball. The shell is provided with adjusting columns on the front and rear sides of the copper ball.

[0011] Wherein, the driving rod is arranged outside the shell.

[0012] The housing further comprises a base, on which a plug-in column is provided, and a plug-in hole matching the plug-in column is provided at the bottom of the housing.

[0013] Wherein, arc-shaped mounting holes are arranged around the base.

[0014] The utility model has the following beneficial effects:

[0015] This device uses a copper ball to drive the connecting component to squeeze the fiber Bragg grating body, causing the fiber Bragg grating body to deform. By monitoring the fiber Bragg grating strain, the change in the fiber Bragg grating central wavelength can be obtained and the point inclination and inclination direction can be inferred in reverse. This can improve the sensitivity of the inclination sensor, is not prone to deformation, can improve the monitoring accuracy of the sensor, and can meet different accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a half-section diagram of the overall structure of the utility model;

[0017] Figure 2 This is the rear view of the structure of the utility model;

[0018] Figure 3 For this utility model Figure 1 A partial enlarged view of point A in the middle.

[0019] The reference numerals in the figures are as follows:

[0020] 1. Housing; 2. Support rod; 3. Connecting rod; 4. Copper ball; 5. Pressing ball; 6. FBG body; 7. Sleeve; 8. Spring; 9. Sliding rod; 10. Circular slideway; 11. Temperature compensator; 12. Adjusting column; 13. Synchronizing rod; 14. Driving rod; 15. Base; 16. Connecting column; 17. Mounting hole; 18. Telescopic rod. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] See also Figures 1 to 3 , the utility model provides a technical solution:

[0023] A fiber Bragg grating inclination angle measuring device includes a shell 1, which can protect a fiber Bragg grating sensor. A support rod 2 is installed inside the shell 1, and the end of the support rod 2 is hinged to a connecting rod 3 through a universal joint. The other end of the connecting rod 3 is fixedly connected to a copper ball 4, and a connecting member is fixedly provided on the copper ball 4. The connecting member and the connecting member are symmetrically arranged with respect to the center of the copper ball 4; the other end of the connecting member is fixedly connected to a pressing ball 5. A semicircular fiber Bragg grating body 6 is also provided inside the shell 1. The fiber Bragg grating body 6 is arranged below the pressing ball 5, and the pressure of the pressing ball 5 causes the fiber Bragg grating body 6 to deform to infer the inclination angle.

[0024] Specifically, after the installation of this device is completed, the connecting rod 3 will tilt, which can drive the pressing ball 5 to cause the fiber grating body 6 to deform. By monitoring the fiber grating strain, the change in the fiber grating central wavelength can be obtained and the point inclination angle and inclination direction can be inferred. The principle is simple and improves the working efficiency of the sensor.

[0025] The connecting member includes a sleeve 7 fixed on the copper ball 4, and a slide rod 9 is slidably connected to the inside of the sleeve 7 through a spring 8, and the other end of the slide rod 9 is fixedly connected to the surface of the pressing ball 5;

[0026] In the initial state, that is, the connecting rod 3, the copper ball 4, and the connecting member are all in a vertical state, and the spring 8 is not subjected to force; when the object to be measured tilts, the copper ball 4 drives the connecting member to tilt along with the object to be measured under the action of gravity, and drives the slide rod 9 to be compressed toward the spring 8 under the action of gravity. Due to the reaction force of the spring 8 and because the fiber grating body 6 senses its surface strain and realizes the transmission of different fiber grating wavelengths, the size of the inclination angle can be inferred by monitoring the difference in the fiber grating wavelength.

[0027] A circular slide 10 is provided through the wall of the housing 1, and the support rod 2 is slidably connected to the circular slide 10; a synchronization rod 13 is also provided on the fiber grating body 6, and the synchronization rod 13 is slidably connected to the circular slide 10; a driving rod 14 is provided between the support rod 2 and the synchronization rod 13, and the driving rod 14 is provided outside the housing 1; the internal structure can be deflected by holding the driving rod 14, and the deflection can be changed according to different usage environments to facilitate installation;

[0028] A temperature compensator 11 is further provided inside the housing 1; the temperature compensator 11 can be used to perform temperature compensation on the fiber Bragg grating body 6 inside the housing 1, thereby preventing the external ambient temperature from affecting the fiber Bragg grating body 6 and causing the inclination sensor to have low measurement accuracy.

[0029] It also includes an adjusting column 12, which is used to limit the deflection amplitude of the copper ball 4. The shell 1 is provided with adjusting columns 12 on the front and rear sides of the copper ball 4. The adjusting columns 12 are used to change the deflection amplitude of the copper ball 4 to avoid excessive deflection of the copper ball 4, which may cause damage and affect the measurement accuracy of the inclination sensor. When the inclination sensor is in the transportation state, the adjusting column 12 is adjusted and the adjusting column 12 is used to limit and support the copper ball 4, which further avoids the inclination sensor from being greatly shaken during transportation, which may cause the copper ball 4 to drive the connecting components and damage them, affecting the measurement accuracy and service life of the inclination sensor.

[0030] The base 15 is provided with a plug-in post 16, and the bottom of the housing 1 is provided with a plug-in hole matching the plug-in post 16; the base 15 and the housing 1 are installed by the mortise and tenon joints between the plug-in hole and the plug-in post 16, which facilitates maintenance personnel to disassemble the fiber Bragg grating inclination sensor and facilitate maintenance personnel to perform maintenance;

[0031] Mounting holes 17 are provided around the base 15. These holes allow bolts to be passed through them for connection to a structure such as a building, facilitating both fixed and adjustable installation of the device. Preferably, the holes 17 are arc-shaped, allowing for adjustable horizontal angles and a more aesthetically pleasing appearance.

[0032] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fiber Bragg grating inclination measuring device, comprising a housing (1), characterized in that: A support rod (2) is installed inside the shell (1), and the end of the support rod (2) is hinged to a connecting rod (3) through a universal joint. The other end of the connecting rod (3) is fixedly connected to a copper ball (4), and a connecting member is fixedly provided on the copper ball (4). The connecting member and the connecting rod (3) are symmetrically arranged relative to the center of the copper ball (4); the other end of the connecting member is fixedly connected to a pressing ball (5), and a semicircular fiber grating body (6) is also provided inside the shell (1). The fiber grating body (6) is provided below the pressing ball (5), and the pressure of the pressing ball (5) causes the fiber grating body (6) to deform and infer an inclination angle.

2. A fiber Bragg grating inclination measuring device according to claim 1, characterized in that: The connecting member comprises a sleeve (7) fixed on the copper ball (4), the interior of the sleeve (7) is slidably connected to a slide rod (9) via a spring (8), and the other end of the slide rod (9) is fixedly connected to the surface of the pressing ball (5).

3. The fiber Bragg grating inclination measuring device according to claim 1, wherein: A circular slideway (10) is provided through the wall of the housing (1), and the support rod (2) is slidably connected to the circular slideway (10); a synchronization rod (13) is also provided on the fiber optic grating body (6), and the synchronization rod (13) is slidably connected to the circular slideway (10); a driving rod (14) is provided between the support rod (2) and the synchronization rod (13).

4. The fiber Bragg grating inclination measuring device according to claim 1, wherein: A temperature compensator (11) is also provided inside the housing (1).

5. The fiber Bragg grating inclination measuring device according to claim 1, wherein: It also includes an adjustment column (12) for limiting the deflection amplitude of the copper ball (4). The adjustment column (12) is provided on the housing (1) and is located on the front side and the rear side of the copper ball (4).

6. The fiber Bragg grating inclination measuring device according to claim 3, characterized in that: The driving rod (14) is arranged outside the housing (1).

7. The fiber Bragg grating inclination measuring device according to claim 1, characterized in that: It also includes a base (15), a plug-in column (16) is provided on the base (15), and a plug-in hole matching the plug-in column (16) is provided at the bottom of the housing (1).

8. The fiber Bragg grating inclination measuring device according to claim 7, characterized in that: Arc-shaped mounting holes (17) are provided around the base (15).

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