Spring type fiber grating dislocation meter

Abstract

The invention discloses a spring type fiber grating dislocation meter. The spring type fiber grating dislocation meter comprises a fiber grating, a strain sensing substrate, a positioning sheet, a protecting casing, compression springs, a slide head, L-shaped steel sheets and a steel sheet, wherein the positioning sheet is fixedly arranged at the inner wall of the protecting casing through a plurality of clamping sheets; both ends of the positioning sheet are fixedly connected with the strain sensing substrate through bolts, and the strain sensing substrate is fixedly arranged between the two L-shaped steel sheets through bolts; the fiber grating is adhered to the middle part of the strain sensing substrate, and a tail fiber of the grating fiber is positioned at the outer side of the protecting casing; the four compression springs are arranged at the upper part and lower part of the positioning sheet in a same way; one end of one compression spring is fixedly connected with the corresponding L-shaped steel sheet, and the other end of one compression spring is fixedly connected with the corresponding steel sheet; the protecting casing is of a rectangular box type, the side surface corresponding to the slide head is provided with a slit movable joint, two small holes are formed in the opposite surface, and the tail fiber of the fiber grating penetrates through the small hole and is sleeved by an optical fiber loose sleeve pipe. The spring type fiber grating dislocation meter has the advantages that the structure is simple, the measuring accuracy is high, the stability is good, the automatic temperature compensation function is realized, the processing and manufacturing are easy, and the sensitivity is high.

Description

technical field [0001] The invention is based on optical fiber grating technology, and is a sensor for real-time monitoring of the relative settlement of structures on both sides of an underground pipe gallery settlement joint, belonging to the technical field of optical fiber sensing. Background technique [0002] The urban underground comprehensive utility corridor is an urban underground comprehensive utility corridor network planned and constructed prior to the development of surrounding plots. As an important part of the sustainable development of urban underground space, it solves the energy demand problem in the development and operation of surrounding areas. With the development and utilization of the surrounding plots, especially the excavation of deep and large foundation pits and the large-scale drop of underground confined water, settlement and deformation of the completed underground comprehensive pipe gallery will occur, and excessive relative settlement will le...

AI Technical Summary

Problems solved by technology

If the relative settlement on both sides of the settlement joint is too large, it may cause deformation and cracking of the energy supply pipeline inside the pipe gallery, which will affect the normal energy supply and even cause a major safety accident

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