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Field test and fading measurement of a distributed acoustic sensor system over a 50 km-long fiber
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Paper Abstract

In this study, we present a direct detection distributed acoustic sensor based on phase-sensitive optical time domain reflectometer (φ-OTDR) with long sensing range and high signal-to-noise ratio (SNR), which is field-tested over a 50 kmlong fiber. Due to the random nature of Rayleigh backscattered light and fading phenomena, it is hard to characterize the performance of the system. For this reason, the performance of our sensor is specified in a statistical manner in which the mean SNR is determined using the histograms of the SNR. The SNR values are measured for identical acoustic signals in five different days, total of 48 hours and the SNR histograms are obtained for fiber distances of 100 m, 12 km, 21 km, 30 km, 40 km and 50 km. The system is field-tested using external disturbances that are generated from a 50-Hz vibrator. The SNR values are extracted from the power spectral density (psd) of the collected data over the monitored fiber span. Our results show that the φ-OTDR system exhibits a mean SNR of 22.5 dB at 50 km distance.

Paper Details

Date Published: 14 May 2018
PDF: 8 pages
Proc. SPIE 10654, Fiber Optic Sensors and Applications XV, 106540D (14 May 2018); doi: 10.1117/12.2304735
Show Author Affiliations
Faruk Uyar, Bilkent Univ. (Turkey)
Tolga Kartaloglu, Bilkent Univ. (Turkey)
Ibrahim Ozdur, Bilkent Univ. (Turkey)
Abdullah Gül Univ. (Turkey)
Ekmel Ozbay, Bilkent Univ. (Turkey)

Published in SPIE Proceedings Vol. 10654:
Fiber Optic Sensors and Applications XV
Alexis Mendez; Christopher S. Baldwin; Henry H. Du, Editor(s)

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