Detection of Brillouin scattering temperature signal in Brillouin optical time-domain reflectometer sensing system based on instantaneous frequency measurement technology

2007 ◽  
Vol 46 (12) ◽  
pp. 124401 ◽  
Author(s):  
An Sun
Keyword(s):  
Time Domain ◽  
Instantaneous Frequency ◽  
Brillouin Scattering ◽  
Frequency Measurement ◽  
Measurement Technology ◽  
Optical Time Domain Reflectometer ◽  
Sensing System ◽  
Temperature Signal ◽  
Optical Time ◽  
Time Domain Reflectometer

scholarly journals Inversion Calculation Analysis of Operational Tunnel Structure Based on the Distributed Optical-Fiber Sensing System

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Jie Zhao ◽  
Jiang Feng ◽  
Liang Ren
Keyword(s):  
Optical Fiber ◽  
Differential Evolution ◽  
Time Domain ◽  
Surrounding Rock ◽  
Optical Time Domain Reflectometer ◽  
Fiber Sensing ◽  
Sensing System ◽  
Optical Fiber Sensing ◽  
Optical Time ◽  
Time Domain Reflectometer

In combination of the actual project in Dalian Baiyun Mountain Tunnel, this paper introduces the principle of fiber optic sensor monitoring system based on optical time domain reflectometer. Then, based on the orthogonal design and even design scheme, this paper carries out a numerical experiment on the tunnel surrounding rock and establishes a regression model of the mapping relation between surrounding rock parameters of operation tunnel and the monitored displacement in order to set the difference between the monitored displacement and the calculated displacement as the fitness function. In the end, this paper carries out parameter identification based on the differential evolution algorithm. Achievements of the study proved that real-time safety warning could be realized inside the tunnel by monitoring the deformation parameters of tunnel vault at real time relying on the optical-fiber sensing system of the optical time domain reflectometer (OTDR). Parameters identification was carried out on the structure with differential evolution according to measured data and selected parameters, and great coincidence was obtained between the measured displacement and the identified parameters displacement, which proved the strong adaptability of the method.

Forward and Backward Raman Amplification of Brillouin Scattering Signal in Brillouin Optical Time Domain Reflectometer System

2014 ◽  
Vol 41 (12) ◽  
pp. 1205007
Author(s):  
毕卫红 Bi Weihong ◽  
杨希鹏 Yang Xipeng ◽  
李敬阳 Li Jingyang ◽  
付兴虎 Fu Xinghu ◽  
付广伟 Fu Guangwei
Keyword(s):  
Time Domain ◽  
Brillouin Scattering ◽  
Raman Amplification ◽  
Optical Time Domain Reflectometer ◽  
Optical Time ◽  
Time Domain Reflectometer ◽  
Scattering Signal
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