2 cm spatial-resolution and 2 km range Brillouin optical fiber sensor using a transient differential pulse pair

被引：176

作者：

Dong, Yongkang ^{[1
]}

Zhang, Hongying ^{[1
]}

Chen, Liang ^{[1
]}

Bao, Xiaoyi ^{[1
]}

机构：

[1] Univ Ottawa, Dept Phys, Fiber Opt Grp, Ottawa, ON K1N 6N5, Canada

来源：

APPLIED OPTICS | 2012年 / 51卷 / 09期

基金：

加拿大自然科学与工程研究理事会;

关键词：

DISTRIBUTED STRAIN-MEASUREMENT; DOMAIN REFLECTOMETRY; TEMPERATURE; FREQUENCY; SPECTRUM; GAIN; LIGHT; BOTDA;

D O I：

10.1364/AO.51.001229

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report a high-spatial-resolution and long-range distributed temperature sensor through optimizing differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA). In DPP-BOTDA, the differential signal suffers from a signal-to-noise ratio (SNR) reduction with respect to the original signals, and for a fixed pulse-width difference the SNR reduction increases with the pulse width. Through reducing the pulse width to a transient regime (near to or less than the phonon lifetime) to decrease the SNR reduction after the differential process, the optimized 8/8.2 ns pulse pair is applied to realize a 2 cm spatial resolution, where a pulse generator with a 150 ps fall-time is used to ensure the effective resolution of DPP-BOTDA. In the experiment, a 2 cm spatial-resolution hot-spot detection with a 2 degrees C temperature accuracy is demonstrated over a 2 km sensing fiber. (C) 2012 Optical Society of America

引用

页码：1229 / 1235

页数：7

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