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Method used for measuring temperature and strain simultaneously and based on brillouin scattering

A technology of Brillouin scattering and measurement method, which is applied in the field of measurement, can solve the problems of not being able to measure temperature and strain at the same time, failing to effectively improve the system signal-to-noise ratio, and limiting the sensing distance of the system, so as to reduce the measurement time, The effect of increasing the sensing distance and improving the spatial resolution of the measurement

Active Publication Date: 2013-03-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Although the method overcomes the contradiction between the spatial resolution of the system and the measurement accuracy, it cannot realize the simultaneous measurement of temperature and strain, and cannot effectively improve the signal-to-noise ratio of the system, which limits the sensing distance of the entire system

Method used

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  • Method used for measuring temperature and strain simultaneously and based on brillouin scattering
  • Method used for measuring temperature and strain simultaneously and based on brillouin scattering
  • Method used for measuring temperature and strain simultaneously and based on brillouin scattering

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Embodiment Construction

[0024] The technical scheme of the present invention is: the light emitted by the narrow linewidth laser LD is output through the polarization-maintaining coupler C1, one light is used as the local oscillator light, and the other light is modulated into stepped light by the electro-optic modulator (EOM) pulse. The pre-pump pulse light whose width is greater than the lifetime of the phonon first enters the sensing fiber FUT to pre-excite the sound wave, and generates a self-published Away scattering signal, while the frequency of the sensing pulse light whose width is smaller than the lifetime of the phonon remains unchanged, Amplify the self-published Alibaba scattering generated by pre-pumped pulsed light by Stimulated Brillouin Scattering (SBS), and the Brillouin Scattering Spectrum (BSS) returning to the incident end is determined by the spectrum The BSS generated by the wide sensing pulse and the BSS generated by the pre-pump pulse with a narrow spectral width are superimpo...

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Abstract

A method used for measuring temperature and strain simultaneously and based on brillouin scattering adopts one measuring system. The measuring system comprises a narrow linewidth laser, a polarization-maintaining coupler, an optical coupler, an optical modulator, an optical amplifier, a circulator, a photoelectric detector and a brillouin frequency shift and strength testing unit. A first optical port of the polarization-maintaining coupler is connected with the laser. A third optical port of the polarization-maintaining coupler is connected with a first optical port of the circulator through the optical modulator and the optical amplifier sequentially. A second optical port of the circulator is connected with sensor fiber, a third optical port of the circulator is connected with a first optical port of the optical coupler, a fourth optical port of the polarization-maintaining coupler is connected with a second optical port of the optical coupler, and a third optical port of the optical coupler is connected with the brillouin frequency shift and strength testing unit through the photoelectric detector. Under the premise that system measuring precision is not reduced, resolution ratio of a measuring space is improved, simultaneously signal to noise ratio of the system can be improved, sensing distance is increased, and measuring time is reduced.

Description

Technical field [0001] The invention relates to a method for simultaneously measuring temperature and strain using a Brillouin optical time domain reflection system, and belongs to the technical field of measurement. Background technique [0002] Brillouin distributed optical fiber temperature and strain simultaneous measurement technology has unique advantages such as obtaining distribution information along the entire optical fiber measured field with only one measurement, high measurement accuracy, accurate positioning, and distances of up to tens of kilometers. , Construction and water conservancy industries, large-scale engineering structure health status online monitoring and fault location application prospects are broad. The Brillouin Optical Time Domain Reflectometer (BOTDR) is a fully distributed optical fiber sensing system based on Brillouin scattering, which uses the frequency of the backward Brillouin scattered light in the sensing fiber The linear relationship bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/36G01B11/16G01K11/32G01K11/3206G01K11/322
Inventor 李永倩李晓娟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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