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Quasi-distributed optical fiber temperature and stress sensor and detector

A technology of stress sensor and optical fiber temperature, applied in the field of sensing, achieves the effects of high sensitivity, simple structure, and strong anti-interference ability

Inactive Publication Date: 2011-08-31
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, it is almost impossible to realize quasi-distributed sensing by using Fabry-Perot F-P resonators formed by FBG pairs.

Method used

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  • Quasi-distributed optical fiber temperature and stress sensor and detector
  • Quasi-distributed optical fiber temperature and stress sensor and detector
  • Quasi-distributed optical fiber temperature and stress sensor and detector

Examples

Experimental program
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Effect test

Embodiment Construction

[0022] When writing gratings on single-mode fiber, the figure 2 The metal baffle shown, such as an aluminum sheet, is placed in front of the phase mask to obtain an F-P cavity with the desired cavity length; because the gate length is fixed, by adjusting the scanning speed of the ultraviolet laser, a suitable FBG reflection can be obtained Rate. Using this method, a series of F-P interferometers with different cavity lengths can be written on the same single-mode optical fiber by changing the distance between the two light-transmitting holes of the baffle.

[0023] When working, the sensing fiber is buried in the area where temperature and stress need to be monitored, and the light emitted by the spectral light source passes through the circulator to each F-P cavity on the sensing fiber and is reflected back to the circulator to reach the spectrum analyzer. The reflected light spectrum information detected by the spectrum analyzer is sent to the computer for processing. Per...

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Abstract

The invention discloses a quasi-distributed optical fiber temperature and stress sensor for multiplexing an F-P (Fabry-Perot) interferometer based on a low-reflectivity FBG (Fiber Bragg Grating). A sensing unit is an F-P resonant cavity consisting of two FBGs; a broadband light source is connected with a sensing optical fiber through a circulator; a plurality of sensing units can be carved on an optical fiber as required; the other end of the circulator is connected with a spectrum analyzer; and a result detected by the spectrum analyzer is output to a computer for analyzing and demodulating. The sensor has high measuring anti-jamming capacity, high reliability and sensitivity, a simple structure and a wide application prospect.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a quasi-distributed optical fiber temperature and stress sensor and detector. Background technique [0002] Real-time monitoring of temperature and stress is of great significance in engineering. Intensive temperature and stress information collection can be applied to the health status analysis and maintenance of large buildings; it can also be used to monitor the performance of some large mechanical equipment, such as aircraft and ships; it can also be used to monitor crustal activity. The traditional distributed sensing realized by time-domain backscattering of optical fiber can realize distributed measurement, and has a simple structure and low cost, but it is difficult to obtain high enough sensitivity. Recently, it has been reported that the distributed stress and temperature sensing based on the phase change of optical fiber backscattered light has achieved very high sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01L1/24G01K11/3206
Inventor 孙琪真刘德明张杰君李晓磊张满亮
Owner HUAZHONG UNIV OF SCI & TECH
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