My current project is “ Fiber optic sensing for structural acoustics control”. Two kinds of optical sensor system are being studied: a) Bragg grating based Fabry-Perot sensor system and b) Fiber tip based Fabry-Perot sensor system.  By taking advantage of an IOC (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 50 Hz to 7.5 kHz with a sensitivity of 0.9 rad/Pa. This sensor is designed to be implemented 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. This sensor system will provide input and reference information for an active structural acoustics control system.

Multiplexed FTFP Sensor System (SDM)

Experiment results for a study performed at 70 Hz

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Last modified: February 23, 2002