Abstract
A distributed fiber-optic acoustic sensor based on digital linear frequency modulated (LFM) pulse and coherent detection is proposed and its proof-of-concept experiment is demonstrated. High-performance measurement has been achieved for the intrapulse acoustic event, which is much shorter than the pulse spatial length. The actual acoustic sensing is achieved using the polystyrene membrane adhered to an only 9 cm long fiber at frequency of 1.5 kHz and 3 kHz. Compared with the direct detection configuration, the time domain envelope correlation coefficient of the coherent detection is twice that of the direct detection, and the standard deviation is less than one third.
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