Determination of thermal residual strain in cabled optical fiber with high spatial resolution by Brillouin optical time-domain reflectometry

2011 ◽  
Vol 49 (9-10) ◽  
pp. 1111-1117 ◽  
Author(s):  
Yuangang Lu ◽  
Cunlei Li ◽  
Xuping Zhang ◽  
Scott Yam
Keyword(s):  
Optical Fiber ◽  
Spatial Resolution ◽  
Time Domain ◽  
Residual Strain ◽  
High Spatial Resolution ◽  
Time Domain Reflectometry ◽  
Optical Time Domain Reflectometry ◽  
Optical Time

scholarly journals Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

2018 ◽  
Vol 8 (10) ◽  
pp. 1899 ◽  
Author(s):  
Shengwen Feng ◽  
Tuanwei Xu ◽  
Jianfen Huang ◽  
Yang Yang ◽  
Lilong Ma ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Bilateral Filtering ◽  
Rayleigh Backscattering ◽  
Detection Frequency ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time ◽  
Phase Generated Carrier

An improved phase-sensitive optical time-domain reflectometry (φ-OTDR) system with sub-meter spatial resolution is demonstrated. Two Michelson interferometers (MIs) with different path length differences are used in the proposed system. One is 10 m, the other is 9.2 m. Two Rayleigh backscattering phase traces with different spatial resolution are obtained by a phase generated carrier (PGC) algorithm at adjacent times. After using differencing and adaptive 2-D bilateral filtering algorithms, a 0.8-m spatial resolution over 2 km is achieved. Experimental results indicate that the system shows an extraordinary linearity as high as 99.94% with amplitude-modulation and acquires a detection frequency from 5 to 500 Hz.

Measurement of Optical Fiber Temperature Sensing Based on Coherent Optical Time Domain Reflectometry

2010 ◽  
Vol 39 (11) ◽  
pp. 1988-1992
Author(s):  
李荣伟 LI Rongwei ◽  
李永倩 LI Yongqian ◽  
杨志 YANG Zhi ◽  
李保罡 LI Baogang
Keyword(s):  
Optical Fiber ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Temperature Sensing ◽  
Optical Time Domain Reflectometry ◽  
Optical Time
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