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Proceedings Paper

Phase-optical time domain reflectometry ([theta]-OTDR) with enhanced performance
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Paper Abstract

In this paper, the phase-sensitive optical time-domain reflectometry (Φ-OTDR) system is experimentally demonstrated using a Rayleigh enhanced AcoustiSens optical fiber to improve the acoustic sensing performance. The AcoustiSens optical fiber made of continuous gratings over the fiber, which significantly enhances the backscattered signal by 15 dB compared to the standard single-mode silica fiber. In addition, a simple and cost-effective self-mixing demodulation technique has been employed in coherent Φ-OTDR system to eliminate the frequency offset between the electrical local oscillator and the beat signal. The acoustic sensing performance with various acoustic frequencies are experimentally demonstrated in the proposed system using a 2 km sensing fiber with 1 m spatial resolution.

Paper Details

Date Published: 2 March 2020
PDF: 6 pages
Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870R (2 March 2020); doi: 10.1117/12.2545089
Show Author Affiliations
Nageswara Lalam, National Energy Technology Lab. (United States)
Ping Lu, National Energy Technology Lab. (United States)
Leidos (United States)
Michael Buric, National Energy Technology Lab. (United States)
Paul R. Ohodnicki, National Energy Technology Lab. (United States)
Carnegie Mellon Univ. (United States)

Published in SPIE Proceedings Vol. 11287:
Photonic Instrumentation Engineering VII
Yakov Soskind; Lynda E. Busse, Editor(s)

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