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Fiber Bragg grating strain-measuring method and fiber Bragg grating strain sensor

A technology of force measuring sensor and fiber grating, which is applied in the direction of measuring force by measuring the change of optical properties of materials when they are stressed, can solve the problems of poor anti-interference, inability to collect data in real time, inaccurate readings, etc., and achieve anti-electromagnetic Interference, accurate force readings, and the effect of automatic measurement

Inactive Publication Date: 2015-06-10
NANJING UNIVERSTIY SUZHOU HIGH TECH INST +1
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AI Technical Summary

Problems solved by technology

[0002] The force sensor in traditional geotechnical testing instruments generally uses a dial indicator for reading, which has poor anti-interference performance, inaccurate readings, coefficients need to be calibrated frequently, and data cannot be collected in real time

Method used

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  • Fiber Bragg grating strain-measuring method and fiber Bragg grating strain sensor
  • Fiber Bragg grating strain-measuring method and fiber Bragg grating strain sensor
  • Fiber Bragg grating strain-measuring method and fiber Bragg grating strain sensor

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Embodiment 1

[0022] A fiber grating load cell, comprising three fiber grating sensing modules 1, 6 and 7, a thin-walled ring 2, a temperature compensation block 3, a signal transmission fiber 4 and a fiber grating demodulator 5, the three fiber grating sensors The sensing modules are connected in series with each other through the signal transmission optical fiber 4, and then respectively pasted on the left and right ends of the outer wall of the thin-walled ring 2, and the surface of the temperature compensation block 3 connected to the thin-walled ring 2, and the fiber grating demodulator 5 is connected to the thin-walled ring 2. The third fiber grating sensing modules 7 at the left and right ends of the outer wall are connected through signal transmission fibers. Both the thin-walled ring 2 and the temperature compensation block 3 are made of metal materials. Among the three fiber grating sensing modules, the first fiber grating sensing module 1 and the third fiber grating sensing modul...

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PUM

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Abstract

The invention discloses a fiber Bragg grating strain-measuring method and a fiber Bragg grating strain sensor. The sensor comprises three fiber Bragg grating sensing modules, a thin-wall ring, a temperature compensating block, signal transmission fibers and a fiber Bragg grating demodulator. The fiber Bragg grating sensing modules are serially connected through the signal transmission fibers and are attached to left and right ends of the thin-wall ring and the surface of the temperature compensating block connected with the thin-wall ring; the fiber Bragg grating demodulator is connected with one of the fiber Bragg grating sensing modules connected to the left and right ends of the thin-wall ring through the signal transmission fiber. The fiber Bragg grating strain-measuring method and the fiber Bragg grating strain sensor have the advantages that measurement readings are more accurate and reliable, electromagnetic interference is resisted, corrosion is resisted, and measuring is automated.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, in particular to an optical fiber grating load cell. Background technique [0002] The load cells in traditional geotechnical testing instruments generally use dial gauges for readings, which have poor anti-interference performance, inaccurate readings, coefficients that need to be calibrated frequently, and data cannot be collected in real time. Optical fiber sensing technology is a sensing technology that began to emerge in the late 1970s. Optical fiber sensors have the advantages of small size, light weight, anti-electromagnetic interference, anti-corrosion, high sensitivity, and easy integration. Among them, the fiber grating sensor (FBG) is a narrow-band filter in which the core of the photosensitive fiber is irradiated by strong ultraviolet light, and the refractive index of the core changes periodically and permanently. Parameters such as temperature and strain can cause ch...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 朱鸿鹄马茜施斌佘骏宽王振玉张诚成
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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