Research on the intrinsic phase difference of Rayleigh scattering in distributed acoustic sensing
Chen Wang,
Di Li,
Qiujie He
et al.
Abstract:The differential cross-phase multiply (DCM) demodulation algorithm based on a 3 × 3 coupler is commonly employed in distributed acoustic systems (DAS) to recover phase information along the sensing fiber. This study investigates the amplitude-spatial resolution response characteristics of the DCM algorithm using 3 × 3 coupler demodulation. Firstly, we theoretically establish the variation of demodulation amplitude in DAS systems due to the intrinsic phase of the signal. Subsequently, we analyze the amplitude-p… Show more
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