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Ultrasonic Transducers by K Nakamura

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8

Electrical evaluation of piezoelectric transducers

K. Nakamura,     Tokyo Institute of Technology, Japan

Abstract:

The characteristics of a piezoelectric transducer can be found by measuring the electrical impedance/admittance. The impedance of a transducer changes steeply around the mechanical resonance frequencies. The constants in an electrical equivalent model are estimated from electrical measurements. An electrical evaluation of a piezoelectric transducer is described. Constants in an equivalent circuit vary as the vibration amplitude and there is non-linearity due to high stress and high temperatures. It is difficult to measure the constants under high-vibration amplitudes. Transducer constants at a high-vibration amplitude using ...

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