圧電共振子の非線形振動を利用した音響位相共役波に関する実験

概要

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This paper presents a new method of exciting the acoustic phase-conjugate wave and its basic experimental results. In recent years, the acoustic phase-conjugate wave has attracted a special interest and several methods for it have been studied. Stimulated by such status, the authors have studied a method of exciting the acoustic phase-conjugate wave using nonlinear vibration in a piezoelectric resonator. That is, ultrasonic pulses were radiated into the piezoelectric resonator driven in the resonance condition. In this case, the main frequency of the pulses was chosen as a half of the resonance frequency of the resonator. The experimental results made clear that the output level of the reflected signals from the resonator increased with the input voltage added to the resonator and that such a characteristic was kept even if the ultrasonic pulses were radiated into the resonator at a certain angle of inclination. The characteristic is surely the same as that of the phase conjugate wave.
社団法人日本音響学会の論文