Displacement sensor based on fiber grating sensing and displacement monitoring device

Abstract

The application relates to a displacement sensor based on fiber grating sensing and a displacement monitoring device. The displacement sensor comprises a shell, a rotating shaft, a push rod, a guide mechanism and a rotating assembly. Two equal-strength beams are arranged in the shell, each equal-strength beam is provided with a strain grating, and the two strain gratings are connected in series through an optical fiber and are connected with a fiber grating demodulator; the rotating shaft penetrates through the shell, is rotationally connected with the shell and is vertically connected with asleeve rod; a gear is arranged on the rotating shaft; a rack is arranged on the push rod and engaged with the gear, and the two ends of the push rod make contact with the free ends of the two equal-strength beams correspondingly; the guide mechanism is connected with the push rod and used for guiding the push rod to do linear motion from one side wall of the shell to the other side wall in a direction perpendicular to an axial direction of the rotating shaft; one end of the rotating assembly is fixedly arranged and can rotate around the end; the other end of the rotating assembly is movably inserted into the sleeve rod and used for driving the rotating shaft to rotate around the axis of the rotating shaft to enable the gear to drive the push rod to reciprocate. The displacement sensor hasthe advantages of long-term reliability and stability.

Description

technical field [0001] The present application relates to the field of sensor technology, in particular to a displacement sensor and a displacement monitoring device based on fiber grating sensing. Background technique [0002] The bridge will have a certain displacement when it is affected by factors such as the upper traffic load, temperature effect, and structural self-weight. During the long-term use of the bridge, the bridge displacement caused by external forces is the most serious. For example, the beam body is subjected to extreme loads (such as a large number of heavy vehicles traveling with eccentric loads), the beam body displacement caused by vehicle braking force, centrifugal force, etc. will directly lead to the bridge limit. The damage of the device, the damage of the beam body block and the displacement of the beam body seriously affect the operation safety of the bridge, and even bridge collapse accidents may occur. [0003] The degree of bridge displacemen...

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Problems solved by technology

[0007] The embodiment of the present application provides a displacement sensor and a displacement monitoring device based on fiber grating sensing to solve the shortcomings of poor long-term reliability and stability in the related art

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