A material surface strain fiber grating reverse differential detection sensor device

Abstract

The invention relates to the field of fiber grating sensing technologies, in particular to a material surface strain fiber grating reverse differential detection sensing device. The fiber grating reverse differential detection sensing device comprises two fiber Bragg gratings, a strain conduction arm, strain extension arms, a stud welding leg, an upper right-angle reverse direction arm, a lower right-angle reverse direction arm and a base, wherein the strain conduction arm, the strain extension arms, the stud welding foot, the upper right-angle reverse direction arm, the lower right-angle reverse direction arm and the base are connected in an integral manner; the fiber gratings are normal fiber Bragg gratings; the two gratings are consistent in performance; and one grating is fixed in grooves on the top ends of the two strain extension arms in an adhering manner, and the other grating is fixed in grooves of the two right-angle reverse direction arms in an adhering manner, and proper pre-stretching is applied in fixation. The material surface strain fiber grating reverse differential detection sensing device disclosed by the invention utilizes a reverse differential amplification principle so as to realize sensibilization for the fiber grating strain sensing sensor, and temperature compensating function can be provided.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensing, in particular to a material surface strain optical fiber grating reverse differential detection sensor device. Background technique [0002] The resistance strain gauge measurement method is a basic traditional means of measuring strain. However, the application of the resistance strain gauge is limited to a certain extent due to its susceptibility to the environment (such as electromagnetic field, temperature, humidity, chemical corrosion, etc.), low precision and short life. The fiber Bragg grating strain sensor has the advantages of fast response, light weight, compact structure, flexible use, low cost, no electromagnetic interference and corrosion resistance, which makes it better for strain detection. [0003] Fiber Bragg grating (Bragg) is a section of optical fiber that uses the photosensitivity of the fiber core material to form a periodical change in the refractive...

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Problems solved by technology

However, the application of the resistance strain gauge is limited to a certain extent due to its susceptibility to the environment (such as electromagnetic field, temperature, humidity, chemical corrosion, etc.), low precision and short life.

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