High-fidelity distributed fiber-optic acoustic sensor with fading noise suppressed and sub-meter spatial resolution | Zendy

Dian Chen | Zendy; Qingwen Liu | Zendy; Zuyuan He | Zendy

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High-fidelity distributed fiber-optic acoustic sensor with fading noise suppressed and sub-meter spatial resolution

Author(s) -

Dian Chen,

Qingwen Liu,

Zuyuan He

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.016138

Subject(s) - fading , optics , image resolution , optical fiber , bandwidth (computing) , distributed acoustic sensing , fiber optic sensor , reflectometry , modulation (music) , intensity modulation , frequency modulation , physics , acoustics , telecommunications , time domain , phase modulation , phase noise , computer science , channel (broadcasting) , computer vision

In order to solve fading problem and realize sub-meter spatial resolution in DAS, this paper proposes a novel configuration of time-gated digital optical frequency domain reflectometry (TGD-OFDR) based on optical intensity modulator (IM). IM has a large modulation bandwidth and the positive and negative harmonics can be fully used to suppress fading while the spatial resolution remains unchanged. In experiments, with fading suppressed, the spatial resolution of DAS is 0.8 m and the strain resolution is about 245.6 pε√Hz along the total 9.8-km sensing fiber. The response bandwidth of vibration is 5 kHz, only/limited by the fiber length.

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