Coupling for a focused ultrasonic transducer
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United States of America Patent
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-
Jan 15, 1980
Grant Date -
N/A
app pub date -
Jun 1, 1978
filing date -
Jun 1, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piezoelectric crystal has a concave active surface and a high acoustical impedance. A flat layer of molded material having a low acoustical impedance faces the active surface of the crystal to form a space therebetween. An intermediate layer of molded material having an intermediate acoustical impedance fills the space between the crystal and the flat layer. Preferably, the intermediate material has a sonic velocity near that of water, and the flat layer has a uniform thickness of approximately 1/4 of the average wavelength of the ultrasonic energy emitted by the crystal. A housing supports the crystal, the flat layer, and the intermediate layer.
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