亚奈奎斯特随机采样突破分布式光纤振动传感带宽障碍
Breaking through the bandwidth barrier in distributed fiber vibration sensing by sub-Nyquist randomized sampling
摘要：
光脉冲的往返时间限制了相敏光时域反射计（OTD-OTDR）中振动的最大可检测频率响应范围。本文提出了一种通过随机调制光脉冲间隔来突破光时域反射仪（OTDR）系统频率响应范围限制的方法，实现了对长传感光纤中每个振动点的随机采样。这种欠采样方法适合于检测稀疏宽带频率的振动信号。在最大采样率为10 kHz的情况下，可以清晰地识别出高达MHz的共振振动信号和1.153MHz的单频振动信号，传感距离为9.6km。
英文摘要：
The round trip time of the light pulse limits the maximum detectable frequency response range of vibration in phase-sensitive optical time domain reflectometry (ϕ-OTDR). We propose a method to break the frequency response range restriction of ϕ-OTDR system by modulating the light pulse interval randomly which enables a random sampling for every vibration point in a long sensing fiber. This sub-Nyquist randomized sampling method is suits for detecting sparse-wideband-frequency vibration signals. Up to MHz resonance vibration signal with over dozens of frequency components and 1.153MHz single frequency vibration signal are clearly identified for a sensing range of 9.6km with 10kHz maximum sampling rate.
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