Acoustic transducer
First Claim
1. An acoustic transducer, comprising a transmitter including a plate of piezoelectric ceramic material having electrodes on opposite surfaces, one side of said plate being covered with an adaptation layer of a thickness approximately one quarter of the wave-length of sound at the resonance frequency of the plate, said adaptation layer comprising a receiver including a layer of piezoelectric or ferroelectric polymer material having a pair of electrodes on opposite surfaces thereof.
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Accused Products
Abstract
An acoustic transducer comprising a transmitter consisting of a plate of piezoelectric ceramic material and a pair of electrodes and an adaptation layer which comprises a receiver consisting of a layer of piezoelectric or ferroelectric polymer material with a pair of electrodes. As a result, optimum operation of the transducer is possible during transmission as well as during reception.
36 Citations
10 Claims
- 1. An acoustic transducer, comprising a transmitter including a plate of piezoelectric ceramic material having electrodes on opposite surfaces, one side of said plate being covered with an adaptation layer of a thickness approximately one quarter of the wave-length of sound at the resonance frequency of the plate, said adaptation layer comprising a receiver including a layer of piezoelectric or ferroelectric polymer material having a pair of electrodes on opposite surfaces thereof.
- 4. An electroacoustic transducer comprising, a first layer of piezoelectric ceramic material having electrodes on opposite surfaces thereof for coupling said layer to a source of electric energy thereby to generate acoustic wave energy for propagation into a liquid medium, an adaptation layer covering one surface of said first layer and having a thickness approximately one quarter wave-length of acoustic wave energy at the resonance frequency of said first layer and located so that acoustic wave energy generated by said first layer propagates through the adaptation layer in its passage to the liquid medium, and wherein said adaptation layer includes at least one layer of a material chosen from the group of materials consisting of piezoelectric polymer materials and ferroelectric polymer materials, said one polymer layer having electrode means thereby to derive an electric energy output in response to acoustic wave energy received via the liquid medium.
Specification