Displacement detection device based on fiber grating technology

Abstract

The utility model relates to an optical fiber technology, in particular to a displacement detection device based on an optical fiber grating technology, which comprises an optical fiber grating displacement meter and a base, and two ends of the displacement meter are respectively fixed on a first base and a second base. The shell is arranged on the outer side of the base and the displacement meter; fixing screws penetrate through the first group of through holes of the shell to fix the shell on the first base; a connecting screw penetrates through the second group of through holes of the shell and is fixed on the second base; the width, perpendicular to the extending direction of the second set of through holes, of the second set of through holes is smaller than the diameter of the circumcircle of the end of the connecting screw, the second set of through holes extend in the displacement direction between the first base and the second base, and when displacement occurs between the first base and the second base, the connecting screw relatively slides in the second set of through holes. The displacement sensor has the advantages of high installation efficiency, long service life and the like, and is applied to displacement detection.

Description

Technical Field

[0001] This utility model relates to optical fiber technology, and in particular to a displacement detection device based on fiber Bragg grating technology. Background Technology

[0002] In engineering applications, many displacement sensors require protective covers that are fixed in concrete, which necessitates drilling holes in the concrete. However, drilling too many holes in a small area, such as the four holes for the protective cover and the four holes for fixing the displacement sensor, can affect the strength of the concrete and lead to low installation efficiency.

[0003] Fiber Bragg gratings are a new type of sensing element that has been developed in recent years. They can realize non-electrical measurements and have many advantages compared with traditional sensors, such as resistance to electromagnetic interference, corrosion resistance, electrical insulation, high sensitivity, and good long-term stability. They have broad application prospects. Summary of the Invention

[0004] To address the shortcomings of the existing technical solutions, this utility model provides a displacement detection device based on fiber Bragg grating technology.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A displacement detection device based on fiber Bragg grating technology includes a fiber Bragg grating displacement gauge and a base, wherein the two ends of the displacement gauge are respectively fixed to a first base and a second base; the displacement detection device further includes:

[0007] A housing, which is disposed outside the base and the displacement gauge;

[0008] A fixing screw passes through a first set of through holes in the housing to fix the housing to the first base;

[0009] A connecting screw passes through a second set of through holes in the housing and is fixed to the second base. The width of the second set of through holes perpendicular to its extension direction is smaller than the circumscribed circle diameter of the end of the connecting screw. The second set of through holes extends along the displacement direction between the first base and the second base. When displacement occurs between the first base and the second base, the connecting screw slides relative to the first base within the second set of through holes.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. High installation efficiency;

[0012] There is no need to drill additional holes in the displacement measurement environment such as concrete to fix the protective cover, which reduces the impact on the strength of the measurement environment and improves the installation efficiency.

[0013] 2. Long service life;

[0014] One end of the housing is fixed, specifically fixed to the first base, while the other end is non-fixed. This allows the connecting screws to slide relative to each other within the second set of through holes in the housing when there is displacement between the first and second bases installed in the measurement environment. This prevents the housing from being damaged and extends its service life accordingly, while also avoiding the impact of external forces on measurement accuracy.

[0015] 3. High sensitivity and good stability;

[0016] It uses fiber Bragg grating technology, which provides electrical insulation, high sensitivity, and good stability. Attached Figure Description

[0017] The disclosure of this utility model will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. In the drawings:

[0018] Figure 1 This is a simplified structural diagram of the displacement detection device according to an embodiment of the present invention;

[0019] Figure 2 This is a simplified internal structure diagram of the displacement detection device according to an embodiment of the present invention. Detailed Implementation

[0020] Figures 1-2 The following description illustrates optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce it. Some conventional aspects have been simplified or omitted to explain the technical solution of the present invention. Those skilled in the art should understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Therefore, the present invention is not limited to the following optional embodiments, but is defined only by the claims and their equivalents.

[0021] Example 1

[0022] A simplified structural diagram of the displacement detection device based on fiber Bragg grating technology according to an embodiment of this utility model is shown below. Figures 1-2 As shown, it includes:

[0023] The fiber optic displacement gauge 41 and the base, wherein the two ends of the displacement gauge 41 are respectively fixed on the first base 21 and the second base 22;

[0024] Housing 11, which is disposed outside the base 21-22 and displacement gauge 41;

[0025] A fixing screw 31 passes through the first set of through holes (not shown) of the housing 11 to fix the housing 11 to the first base 21;

[0026] A connecting screw 32 passes through the second set of through holes 12 of the housing 11 and is fixed to the second base 22. The width of the second set of through holes 12 perpendicular to its extension direction is smaller than the circumscribed circle diameter of the end of the connecting screw 32. The second set of through holes 12 extends along the displacement direction between the first base 21 and the second base 22. When displacement occurs between the first base 21 and the second base 22, the connecting screw 32 slides relative to the first base 21 within the second set of through holes 12, thus preventing the housing 11 from being damaged.

[0027] To avoid bending stress caused by unevenness of the fixed surface, further, such as Figure 2 As shown, the displacement gauge is connected to joint bearings at both ends, and the joint bearings are fixed on the first base and the second base.

[0028] To further improve installation efficiency, such as Figure 2 As shown, the joint bearing is fixed to the top of the first base and the second base using screws.

[0029] Example 2

[0030] An example of the application of a displacement detection device based on fiber optic grating technology in building engineering according to Embodiment 1 of this utility model.

[0031] In this application example, such as Figure 1 As shown, four holes are drilled in the concrete, and screws are passed through the holes at the bottom of the first base 21 and the second base 22 and fixed in the four holes in the concrete, thereby fixing the first base 21 and the second base 22 to the concrete.

[0032] like Figure 1 As shown, the housing 11 is a hollow cuboid structure and is disposed outside the displacement gauge 41, the first base 21, and the second base 22. A first set of through holes is provided on opposite sides of one end of the housing 11, and a second set of through holes 12 is provided on opposite sides of the other end. The second set of through holes 12 extends along the displacement direction between the first base 21 and the second base 22.

[0033] A fixing screw 31 (an internal hexagon screw in this embodiment) passes through the first set of through holes (not shown) of the housing 11 and is fixed in hole 23, thereby fixing the housing 11 to the first base 21. A connecting screw 32 (a flathead screw in this embodiment) passes through the second set of through holes 12 of the housing 11 and is fixed in hole 23 of the second base 22. The width of the second set of through holes 12 perpendicular to its extending direction is smaller than the circumscribed circle diameter of the end of the connecting screw 32. When displacement occurs between the first base 21 and the second base 22, the connecting screw 32 slides relative to the second set of through holes 12, preventing the housing 11 from being damaged. At the same time, the connecting screw 32 will not disengage from the second set of through holes 12, that is, the housing 11 will not disengage from the second base 22.

[0034] like Figure 2 As shown, the two ends of the displacement gauge 41 are respectively connected to the joint bearing 42, and the joint bearing 42 is fixed to the top of the first base 21 and the second base 22 by screws 33.

[0035] The displacement detection device in this embodiment operates as follows:

[0036] When the concrete deforms, a relative displacement occurs between the first base 21 and the second base 22. At this time, there is relative movement between the housing 11 and the second base 22, and the connecting screw 32 slides relative to each other (in either the forward or reverse direction) within the second set of through holes 12, preventing the housing 11 from being damaged.

[0037] The fiber optic displacement meter 41 converts the displacement of the generator into an optical signal, which is transmitted to the acquisition and analysis instrument through an optical cable. The analysis instrument then analyzes the displacement based on the optical signal.

Claims

1. A displacement detection device based on fiber Bragg grating technology, comprising a fiber Bragg grating displacement gauge and a base, wherein the two ends of the displacement gauge are respectively fixed on a first base and a second base; characterized in that, The displacement detection device further includes: A housing, which is disposed outside the base and the displacement gauge; A fixing screw passes through a first set of through holes in the housing to fix the housing to the first base; A connecting screw passes through a second set of through holes in the housing and is fixed to the second base. The width of the second set of through holes perpendicular to its extension direction is smaller than the circumscribed circle diameter of the end of the connecting screw. The second set of through holes extends along the displacement direction between the first base and the second base. When displacement occurs between the first base and the second base, the connecting screw slides relative to the first base within the second set of through holes.

2. The displacement detection device based on fiber Bragg grating technology according to claim 1, characterized in that, The displacement gauge is connected to joint bearings at both ends, and the joint bearings are fixed on the first base and the second base.

3. The displacement detection device based on fiber Bragg grating technology according to claim 2, characterized in that, The spherical bearing is fixed to the top of the first base and the second base.

4. The displacement detection device based on fiber Bragg grating technology according to claim 3, characterized in that, The joint bearing is secured with screws.

5. The displacement detection device based on fiber Bragg grating technology according to claim 1, characterized in that, The fixing screws are hex socket head cap screws, and the connecting screws are flathead screws.

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