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首页> 外文期刊>Optical engineering >Effects of weak fiber Bragg gratings on a distributed vibration sensing system based on phase-sensitive optical time-domain reflectometry
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Effects of weak fiber Bragg gratings on a distributed vibration sensing system based on phase-sensitive optical time-domain reflectometry

机译：基于相敏光时域反射仪的弱光纤布拉格光栅对分布式振动传感系统的影响

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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.
机译：基于弱光纤布拉格光栅（wFBG）增强型相敏光时域反射仪（Φ-OTDR）的分布式光纤传感系统具有改进的信噪比（SNR）和灵敏度。从理论和实验上研究了wFBGs对Φ-OTDR系统的影响。由wFBG引起的SNR改善（与瑞利散射相比具有更高的反射率）已在具有不同激光源线宽的系统中进行了分析。实验结果表明，具有-35 dB反射率的wFBG辅助的Φ-OTDR具有较低的噪声水平，其SNR提高了27 dB。通过比较不同线宽的激光源，可以证明增强型系统不再需要超窄线宽激光。 2.4 km-wFBG阵列不同位置的SNR保持较高水平。

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