Broad band acoustic transducer

Details Broad band acoustic transducer Broad band acoustic transducer

1985-07-15

1987-10-06

Salce, Patrick R.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310327, 367152, 367162, H01L 4108

Patent

active

046985417

ABSTRACT:
There is provided by this invention a broad band acoustic transducer comprising a piezoelectric crystal with a two layer dampening backing having very high attenuation properties. Each layer has an impedance matching the acoustical impedance of the crystal, however, the second layer has an attenuating additive that greatly increases its attenuation factor. The surface interface between the two dampening layers is tilted and roughened to induce wave scattering that prevents back reflections.

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patent: 4528652 (1985-07-01), Horner et al.
Y. Bar-Cohen et al., "Multiphase Backing Materials for Piezoelectric Broadband Transducers", Acoustical Society of America, May 1984, pp. 1629-1633.
Swartz et al., "An Improved Wedge-Type Backing for Piezoelectric Transducers", IEEE Transactions of Sonics and Ultrasonics, vol. SU-26, No. 2, Mar. 1979, pp. 140-142.
Persson et al., "Acoustic Impedance Matching of Medical Ultrasound Transducers", Ultrasonics, Mar. 1985, pp. 83-89.
DeJong et al., "Vibration Modes, Matching Layers and Grating Lobes", Ultrasonics, Jul. 1985, pp. 176-182.

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