A high-sensitivity and high-spatial-resolution distributed acoustic sensor based on phase-sensitive optical frequency domain reflectometry ($ \Phi $-OFDR) is proposed. The vibration information is retrieved from the phase change of the complex Rayleigh backscattering. Inner-pulse division and rotating-vector-sum methods are employed to overcome the fading problem and to suppress the crosstalk along the fiber. For the first time, to the best of our knowledge, the waveforms of two simultaneous kilohertz-level vibrations along a 950 m fiber are recovered thanks to the enhanced crosstalk suppression ratio. The spatial resolution of 12 cm and strain resolution of $ 1\,\,{\rm n}\varepsilon /\sqrt {{\rm Hz}} $ are experimentally achieved.

中文翻译：

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基于Φ-OFDR且具有增强的串扰抑制功能的高空间分辨率光纤分布式声传感器

基于相位敏感光频域反射（A高灵敏度和高空间分辨率的分布式声传感器$ \披$ -OFDR）提出。振动信息是从复杂的瑞利反向散射的相位变化中获取的。内脉冲分割和旋转矢量和方法用于克服衰落问题并抑制沿光纤的串扰。据我们所知，这第一次是由于增强的串扰抑制比，恢复了沿950 m光纤同时发生的两个千赫兹级振动的波形。通过实验实现了12 cm的空间分辨率和$ 1 \，\，{\ rm n} \ varepsilon / \ sqrt {{\ rm Hz}} $的应变分辨率。