Normalized differential method for improving the signal-to-noise ratio of a distributed acoustic sensor

Islam Ashry, Yuan Mao, Mohd Sharizal Alias, Tien Khee Ng, Frode Hveding, Muhammad Arsalan, Boon S. Ooi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We experimentally introduce a normalized differential method to enhance the time domain signal-to-noise ratio (SNR) of an optical fiber distributed acoustic sensor (DAS). The reported method is calibrated against the typical differential method in noisy DAS systems, including those utilizing a relatively wide linewidth laser or few-mode fiber. In these two systems, the normalized differential method respectively identifies the position information of various vibration events with 1.7 dB and 0.53 dB SNR improvement. We further demonstrate the ability to locate positions along a fiber that are subjected to vibrations of frequencies higher than the theoretical maximum, but without determining these frequencies.
Original languageEnglish (US)
Pages (from-to)4933
JournalApplied Optics
Volume58
Issue number18
DOIs
StatePublished - Jun 14 2019

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