Distributed OTDR-interferometric sensing network with identical ultra-weak fiber Bragg gratings

被引：163

作者：

Wang, Chen ^{[1
]}

Shang, Ying ^{[1
]}

Liu, Xiao-Hui ^{[1
]}

Wang, Chang ^{[1
]}

Yu, Hai-Hu ^{[2
]}

Jiang, De-Sheng ^{[2
]}

Peng, Gang-Ding ^{[1
,3
]}

机构：

[1] Shandong Acad Sci, Laser Inst, Shandong Prov Key Lab Opt Fiber Sensing Technol, Jinan 250014, Shandong, Peoples R China

[2] Wuhan Univ Technol, Natl Engn Lab Fiber Opt Sensing Technol, Wuhan 430070, Peoples R China

[3] Univ New S Wales, Sch Elect Engn & Telecommun, Sydney, NSW 2052, Australia

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 22期

关键词：

INTRUSION-SENSOR SYSTEM; FBG SENSORS; INTERROGATION; HYDROPHONE; RESOLUTION; STRAIN;

D O I：

10.1364/OE.23.029038

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate a distributed sensing network with 500 identical ultra-weak fiber Bragg gratings (uwFBGs) in an equal separation of 2m using balanced Michelson interferometer of the phase sensitive optical time domain reflectometry (f-OTDR) for acoustic measurement. Phase, amplitude, frequency response and location information can be directly obtained at the same time by using the passive 3 x 3 coupler demodulation. Lab experiments on detecting sound waves in water tank are carried out. The results show that this system can well demodulate distributed acoustic signal with the pressure detection limit of 0.122Pa and achieve an acoustic phase sensitivity of around -158dB (re rad/mu Pa) with a relatively flat frequency response between 450Hz to 600Hz. (C) 2015 Optical Society of America

引用

页码：29038 / 29046

页数：9

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