Intracavity-type fiber Fabry-Perot slippage measurement sensor

A sensor and optical fiber technology, applied in the field of sensors, can solve problems such as strong electromagnetic interference, and achieve the effects of not affecting measurement accuracy, high anti-shake and anti-vibration technology, and strong practicability

Active Publication Date: 2017-06-23
陈艺征
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, mechanical and electrical equipment are usually used for measurement, but these equipment usually have high requirements for the use environment, such as high temperature, low temperature, strong electromagnetic interference, etc. These occasions are not suitable for use

Method used

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  • Intracavity-type fiber Fabry-Perot slippage measurement sensor
  • Intracavity-type fiber Fabry-Perot slippage measurement sensor
  • Intracavity-type fiber Fabry-Perot slippage measurement sensor

Examples

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Embodiment 1

[0042] The invention provides a sensor for measuring slip in an inner cavity optical fiber Fabry Perot, such as figure 1 , figure 2 As shown, it includes a reflective slope 1, a sealed dust cover 2, a sensor body 3, a first optical fiber 4, and a second optical fiber 5, wherein:

[0043] The material of the reflective slope and the sensor body can be metal.

[0044] The sealed dustproof cover 2 is a flexible pipe body with a cavity 8 inside and two ends connected through. One end of the flexible pipe body is sealed and connected to the sensor body 3, and the other end is sealed and connected to the reflective slope 1;

[0045] The bottom side of the reflective inclined surface 1 is a plane, and its upper side is provided with an inclination angle of θ with its bottom side plane. 1 The first inclined plane 6, the inclination angle is θ 2 The second inclined plane 7 is provided with a reflective surface on the upper side surfaces of the first inclined plane 6 and the second ...

Embodiment 2

[0070] This embodiment has been improved on the basis of embodiment 1, as Figure 5 As shown, the specific improvements are as follows:

[0071] The first intersection line between the plane where the first slope 6 is located and the plane on the bottom side is perpendicular to the second intersection line between the plane where the second slope 7 is located and the plane on the bottom side,

[0072] and θ 1 ,θ 2 The condition that must be satisfied is sinθ 1 sinθ 2 ≠0.

[0073] Such as Figure 5 As shown, in actual use, in order to be able to simultaneously measure the slip in the x and y directions, the sensor uses two optical fibers and two reflective surfaces to measure the slip in one direction. During specific measurements (such as: To measure the displacement between object A and object B), you can grind a small groove with a flat bottom surface on object B (in fact, it does not necessarily have to be polished, there is another method, which is to weld the reflec...

Embodiment 3

[0076] This embodiment has been improved on the basis of embodiment 1, as Figure 6 As shown, the specific improvements are as follows:

[0077] The sensor also includes a third optical fiber, and the bottom of the third optical fiber is provided with a reflective end face, and the third optical fiber passes through the sensor body 3 and extends into the cavity 8;

[0078] The upper side of the reflective inclined surface 1 is also provided with an inclination angle of θ with its bottom side plane. 3 The third inclined plane 9 is provided with a reflective surface on the upper side surface of the third inclined plane 9;

[0079] And the first inclined plane 6, the second inclined plane 7 and the third inclined plane 9 must satisfy the condition that the determinant is not equal to 0, where (l 1 ,m 1 ,n 1 ), (l 2 ,m 2 ,n 2 ), (l 3 ,m 3 ,n 3 ) are respectively the normal vectors of the first, second and third slopes;

[0080] The optical axis of the third optical fi...

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PUM

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Abstract

The invention provides a sensor for measuring the relative slippage between interfaces based on the EFPI principles. The sensor can comprise two optical fibers and two inclined planes disposed on a reflection inclined plane. The surface of each inclined surface is provided with a reflection plane, and the bottoms of the optical fibers are provided with reflection end faces. Moreover, the reflection planes are perpendicular to the optical axis of one optical fiber, thereby forming a Fabry-Perot cavity between the reflection end faces and an emission plane. At this moment, the slippage of an object B relative to an object B in a plane can be measured. Also, one optical fiber and one inclined surface can be added, so the slippage of the object B relative to the object A in a three-dimensional space can be measured. The sensor is not affected by temperature and electromagnetic factors, is high in precision, and is high in anti-interference and durability performances. The sensor is good in application prospect, is especially suitable for the high-precision measurement of the slippage and environment temperature under the action of structure static force and power or long-time load, and can judge the safety degree of a structure.

Description

technical field [0001] The invention relates to a sensor for measuring slippage, in particular to an inner-cavity optical fiber Fabry-Perot sensor for measuring slippage, which belongs to the field of sensors. Background technique [0002] Since the bonding effect between the steel plate and concrete is smaller than that of reinforced concrete in the steel plate concrete composite structure, the interface slip of the steel plate concrete composite structure is inevitable. The relative slippage of the interface is mainly due to the insufficient shear bond strength between the interface of concrete and steel plate, which reduces the combination effect, resulting in inconsistent deformation of the two. In the prior art, convenient mechanical and electrical equipment are usually used for measurement, but these equipment usually have high requirements for the use environment, such as high temperature, low temperature, strong electromagnetic interference, etc. These occasions are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01B11/161G01B11/002G01D5/35312
Inventor 陈艺征
Owner 陈艺征
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