Abstract
Recent work on acoustic measurements using a fiber-tip-based Fabry–Perot sensor system is presented. A single Fabry–Perot sensor using a path matched Mach–Zehnder interferometer is developed, and by taking advantage of an integrated optical circuit phase modulator, a digital demodulation scheme based on the phase stepping technique is developed. It has been determined that this system can be used to detect acoustic fields in the frequency range of 20 Hz–6 kHz with a sensitivity of 0.9 rad/Pa. This sensor is designed to be used in a multiplexed architecture to provide inputs to a structural acoustic control system. A series of experiments are performed to investigate the possibility and potential use of this sensor system for acoustic noise detection. In this study, initial test data from the prototype optical sensor microphone are presented and the envisioned multiplexed sensor scheme and control system are illustrated.
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