光时域反射计
解调
光学
反射计
时域
干涉测量
相(物质)
干扰(通信)
分布式声传感
光纤传感器
相位检测器
光纤
相位调制
物理
计算机科学
相位噪声
电信
光纤分路器
频道(广播)
量子力学
计算机视觉
电压
作者
Gaosheng Fang,Tuanwei Xu,Shengwen Feng,Fang Li
标识
DOI:10.1109/jlt.2015.2414416
摘要
We propose a novel approach to generate distributed fiber sensing system based on phase-sensitive optical time domain reflectometer (Φ-OTDR) and phase-generated carrier demodulation algorithm. An unbalanced Michelson interferometer is introduced at the receiving end of the system. The back Rayleigh scattering light from a certain position along the sensing fiber would interfere to generate interference light signal versus time, whose phase carries the sensing information. Phase-generated carrier demodulation algorithm is proposed and carried out to recover the phase information. A single frequency vibration event is applied to a certain position along the sensing fiber and we realize to demodulate it correctly. The noise level of the phase sensitive OTDR system is about 3 × 10 -3 rad/VHz and a signal to noise ratio about 30.45 dB is achieved. The maximum sensing length and the spatial resolution of the Φ-OTDR system are 10 km and 6 m with pulse repetition rate at 10 kHz and 6 m fiber delay in MI with interrogating pulse width of 30 ns.
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