Abstract
A multi-frequency fiber optic acoustic sensor (FOAS) based on graphene-oxide Fabry-Perot microcavity (GO-FPM) is proposed and demonstrated. The micrometer-size FP cavity is formed by a single-mode-fiber end surface and a layer of GO diaphragm. The GO diaphragm is used as the acoustic sensitive diaphragm to realize the acoustic signal detection. The performance of the GO-FPM FOAS for single-frequency, dual-frequency and triple-frequency acoustic signal detection is experimentally investigated. The influence of the input optical power and wavelength on sensor performance is also investigated. As for single-frequency acoustic signal detection, the signal to noise ratio (SNR) can be as high as 65.2 dB, with a broad frequency response ranged from 400 Hz to 20 kHz and a high linearity of ≈1. The SNRs for the dual-frequency and the triple-frequency acoustic signal detection can be >65.1 dB and >61.8 dB, respectively. The proposed GO-FPM FOAS have potential applications in structural health monitoring, fiber hydrophone, pipeline leakage detection, biomedicine, etc.
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