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

被引：48

作者：

Ashry, Islam ^{[1
]}

Mao, Yuan ^{[1
]}

Alias, Mohd Sharizal ^{[1
]}

Ng, Tien Knee ^{[1
]}

Hveding, Frode ^{[2
]}

Arsalan, Muhammad ^{[2
]}

Ooi, Boon S. ^{[1
]}

机构：

[1] KAUST, Comp Elect & Math Sci & Engn, Thuwal 239556900, Saudi Arabia

[2] Saudi Aramco, EXPEC Adv Res Ctr, Dhahran 34464, Saudi Arabia

来源：

APPLIED OPTICS | 2019年 / 58卷 / 18期

关键词：

Acoustic Sensors - Differential methods - Few-mode fibers - Linewidth lasers - Position information - SNR improvement - Time-domain signal;

D O I：

10.1364/AO.58.004933

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2019 Optical Society of America

引用

页码：4933 / 4938

页数：6

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