Abstract
The performance of two types of composite transducers designed for simultaneous imaging at two frequencies and for sensitive and low noise imaging is studied. The composite transducer is composed of a PZT plate (or PZT concave) and a piezoelectric polymer film of P(VDF-TrFE), which are stacked together on a backing load. The PZT plate (or PZT concave) and P(VDF-TrFE) film operate independently at the different center frequencies, respectively, as a transmitter and/or receiver. The frequency response and impulse response characteristics measured for various driving/receiving modes are in good agreement with the expected ones evaluated from the Mason’s equivalent circuit. The response frequency band is widen in the operation mode where PZT is used as a transmitter and P(VDF-TrFE) as a receiver. The composite transducer has a useful transducer for medical imaging.
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