Based on characteristics of Rayleigh scattering light, one can achieve distributed measurements based on the correlation analysis of signals in the optical frequency domain reflectometry (OFDR) system. In this paper, we propose to apply overlapped sliding window in the subsections of signals and choose appropriate weighted function of generalized cross-correlation algorithm through experimental comparison in an OFDR distributed fiber-optic vibration sensing system based on cross-correlation algorithm. Experimental results show that by using the proposed technique, the OFDR performs with an improved positioning accuracy and a reduced false alarm rate. Furthermore, a distributed vibration sensor with the positioning accuracy of 0.247 m and the measurable vibration frequency ranging from 5 kHz to 50 kHz is demonstrated.
LIU Xiao, CHE Qian, LI Xinyu, WEN Hongqiao
. Distributed Vibration Sensing System Based on Optical Frequency Domain Reflectometry and Cross-Correlation Algorithm[J]. Journal of Applied Sciences, 2020
, 38(6)
: 864
-870
.
DOI: 10.3969/j.issn.0255-8297.2020.06.003
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