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A method for improving sensitivity of fbg sensor based on cantilever beam structure

A cantilever beam and sensitivity technology, which is applied in the field of sensitivity improvement of FBG sensors based on cantilever beam structure, can solve the problems of low temperature and strain sensitivity, affect the performance of the sensor, complicated layout process, etc., so as to improve the sensing sensitivity and realize multi-parameter transmission. Sensory measurement and high measurement accuracy

Active Publication Date: 2017-10-10
ANHUI CASZT PHOTOELECTRIC MEASUREMENT & CONTROL TECH CO LTD
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Problems solved by technology

[0003] The main component is SiO 2 The bare grating is small and brittle, especially the shear resistance is very poor, and it has encountered many problems in the practical engineering application directly as a sensor, such as low temperature and strain sensitivity, easy damage, complex layout process, etc.
And the central wavelength of FBG has a cross-sensitive effect on temperature and stress, which affects the performance of the sensor

Method used

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  • A method for improving sensitivity of fbg sensor based on cantilever beam structure
  • A method for improving sensitivity of fbg sensor based on cantilever beam structure
  • A method for improving sensitivity of fbg sensor based on cantilever beam structure

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] like figure 1 As shown, a method for improving the sensitivity of a FBG sensor based on a cantilever beam structure comprises the following steps:

[0029] S1. Open a through hole at an appropriate position of the cantilever beam, and make the through hole symmetrical with respect to the central axis of the cantilever beam;

[0030] Select a cantilever beam of appropriate size and shape, and drill holes in the appropriate position on the cantilever beam. The shape of the hole is rectangle, rhombus, circle, triangle, etc.

[0031] like figure 2 As shown, choose to manufacture a relatively simple equal-section cantilever beam, and manufacture a square through hole in its center, one end of which is fixed, and the other end is used to apply the load to be measured.

[0032] S2. Taking the direction perpendicular to the section of the th...

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Abstract

The invention provides an FBG sensor sensitivity improving method based on a cantilever structure. The method comprises the steps of: forming a through hole in a suitable position of the cantilever; determining the maximum part of two positive strains and the maximum part of two negative strains of the cantilever at present; bonding one FBG to the maximum part of two positive strains and the maximum part of two negative strains of the cantilever respectively; and superposing spectrums of the two FBGs and utilizing an FBG spectrum broadening effect to carry out sensing demodulation on the two FBGs. According to the invention, a simple punching method is utilized to add strain changes, and the ingenious design of the bonding positions of the FBGs and the suitable demodulation mode are adopted, so that the sensing sensitivity is improved, and temperature self-compensation and multi-parameter sensing measurement are realized; in addition, the FBG sensor sensitivity improving method has the advantages that the interference resistance is high, the long-term drifting is small, the measuring precision is high, and flow measurement under severe industrial environments such as high temperature, high pressure and high electromagnetic interference can be realized.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to a method for improving the sensitivity of an FBG sensor based on a cantilever beam structure. Background technique [0002] In 1978, K.O.HILL and others from Ottawa Communication Research Center in Canada first discovered the photosensitive effect of optical fiber in germanium-doped silica optical fiber, and used the standing wave writing method to make the world's first fiber Bragg grating (FBG). FBG sensor has the advantages of small size, low loss, high sensitivity, anti-electromagnetic interference, good electrical insulation, wide bandwidth, etc., and can realize multi-point distributed measurement. It has been applied in bridges, mines, tunnels, dams, buildings, Fruitful results have been achieved in ship systems, marine, aviation, medical fields, power systems, etc. [0003] The main component is SiO 2 The bare grating is small and brittle, especially the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26G01D5/353
CPCG01D5/268G01D5/35316
Inventor 董凤忠杨爽李俊徐胜明朱莉莎汤玉泉孙苗董坤
Owner ANHUI CASZT PHOTOELECTRIC MEASUREMENT & CONTROL TECH CO LTD
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