Abstract
Very high intensity and high frequency ultrasonic transducer using hydrothermal KNbO 3 thick film was developed. The vibration velocity of surface of KNbO 3 thick film was measured with thickness vibration mode. The amplitude of vibration velocity was 2.5m/s or over. And the radiation sound-pressure from the prototype ultrasonic transducer was measured at resonance frequency in degassed water. The radiation ultrasound was 4MPa or over.
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