Piezoelectric apodized ultrasound transducers

Details Piezoelectric apodized ultrasound transducers Piezoelectric apodized ultrasound transducers

1982-09-22

1985-05-21

Wong, Peter S.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, 361233, 367153, H04R 1700, H01L 4108

Patent

active

045188890

ABSTRACT:
An ultrasound transducer for medical pulse echo applications is apodized by causing the level of response to vary as a function of position on the transducer aperture. In a preferred embodiment, the response varies as a Gaussian function of distance from the center or centerline of the transducer so that the response at the edge of the transducer is approximately 30% of the response at the center or centerline. The response may be varied by causing the polarization of a piezoelectric ceramic transducer to decrease as a function of distance from the acoustic axis. In a preferred embodiment the transducer comprises a matrix of parallel rods of piezoelectric ceramic in an inert binder. The polarization of the piezoelectric body may be controlled by locally polarizing regions of the transducer with different voltages or for different periods of time. A polarization profile may also be produced by selectively heating localized regions of a previously uniformly polarized transducer to selectively depolarize them.

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patent: 4375042 (1983-02-01), Marcus
patent: 4412148 (1983-10-01), Klicker et al.
patent: 4460841 (1984-07-01), Smith et al.

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