Abstract
In this paper, sensitivity and response frequency tunable optical fiber acoustic sensor technology is proposed for the first time, in which a C-shape pedestal mounted diaphragm sensor structure is employed for prestress tuning and consequently for the rigidity adjustment of the diaphragm to investigate and improve the performance of single mode-multimode-single mode (SMS) fiber acoustic sensor. By employing the proposed sensor structure, the influence of prestress on the resonance frequency and the sensitivity of optical fiber acoustic sensor can be investigated theoretically and experimentally. The results also confirm that the proposed method provide a simple but effective solution for the performance improvement of acoustic sensor, by which the response range can be extended from 800 Hz to 1500 Hz with a sensitivity fluctuation of 0.7 dB and a value of 0.998 by adjusting the prestress of diaphragm, meanwhile the background noise can be significantly suppressed from −57 dB to −67 dB.
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