光纤布拉格光栅
激光线宽
材料科学
瑞利散射
反射计
光时域反射计
光学
激光器
光纤
灵敏度(控制系统)
光纤传感器
分布式声传感
信噪比(成像)
光纤激光器
时域
保偏光纤
物理
电子工程
计算机科学
工程类
计算机视觉
作者
Xinyu Li,Qian Che,Liu Xiao,Zhu Pan,Hao Wen
出处
期刊:Optical Engineering
[SPIE - International Society for Optical Engineering]
日期:2019-08-16
卷期号:58 (08): 1-1
被引量:1
标识
DOI:10.1117/1.oe.58.8.087103
摘要
A distributed fiber sensing system based on weak fiber Bragg gratings (wFBGs) enhanced phase-sensitive optical time-domain reflectometry (Φ-OTDR) has improved signal-to-noise ratio (SNR) and sensitivity. The effects of wFBGs on a Φ-OTDR system are investigated theoretically and experimentally. The SNR improvement induced by wFBGs, which have higher reflectivity compared with the Rayleigh scattering, has been analyzed in systems with different laser source linewidths. The experimental results show that Φ-OTDR assisted by wFBGs with −35-dB reflectivity has a lower noise level and its SNR is improved by 27 dB. By comparing laser sources with different linewidths, it is proved that the enhanced system no longer requires an ultranarrow linewidth laser. The SNR in different locations of a 2.4-km-wFBG-array remains at a high level.
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