Proceedings of Meetings on Acoustics
نویسنده
چکیده
The development of a passive, sonic crystal-based device with unusual properties will be reported. This device combines a 1D sonic crystal, a nonlinear medium, and an acoustic low pass filter to allow broadband ultrasound propagation as a collimated beam for specialized underwater communication. The signal to be transmitted is first amplitude modulated with a high-frequency ultrasonic carrier wave and applied to one side of the device. The device then demodulates this signal and the original low frequency signal appears as a collimated beam on the other side. The sonic crystal provides a band pass acoustic filter through which the high-frequency ultrasonic signal can pass through and the nonlinear medium then demodulates the signal and also generates the low frequency sound beam through the parametric array concept. The low pass filter removes any remaining high frequency components. The device also functions in a unidirectional manner. Design details of the device and experimental data will be presented.
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