Abstract
A novel acoustic sensor based on a polypropylene/poly (ethylene terephthalate) (PP/PET) diaphragm is demonstrated. The Michelson interferometer is formed by two beams of light that are reflected into optical fiber collimators by both sides of the PP/PET film. The deformation of diaphragm caused by acoustic signal will be magnified twice in the optical path of proposed sensor. The sensitivity of our proposed sensor is more than −128 dB re 1 rad/ $\mu $ Pa in the frequency range of 90–4000 Hz, and a signal-to-noise ratio of $\sim 42$ dB is achieved at 600 Hz. Due to its superiorities of low cost, small size, high sensitivity, and easy fabrication, the proposed sensor exhibits a potential for low-frequency acoustic sensing and healthy monitoring.
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