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

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 ph...

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Bibliographic Details
Published in:Applied sciences 2018-10, Vol.8 (10), p.1899
Main Authors: Feng, Shengwen, Xu, Tuanwei, Huang, Jianfen, Yang, Yang, Ma, Lilong, Li, Fang
Format: Article
Language:English
Subjects:
Acoustics
Adaptive algorithms
Adaptive filters
Algorithms
Backscattering
fiber optics sensors
Interferometers
Lasers
Light
Linearity
Michelson interferometers
optical sensing and sensors
Optics
Signal processing
Spatial discrimination
Spatial resolution
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8101899