Ultrasonic transducer shading

Details Ultrasonic transducer shading Ultrasonic transducer shading

1982-02-16

1984-07-17

Farley, Richard A.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310358, 310365, 367155, 367905, H01L 4104, H04R 1700

Patent

active

044608411

ABSTRACT:
The radiation pattern of shaded single element piezoelectric transducers and transducer arrays has reduced side lobe levels. Shading to reduce the intensity of emitted ultrasound at the edges of the transducer relative to the center is realized by varying the electric/acoustic conversion efficiency or polarization of the piezoelectric material, by having different mechanical element lengths, by selectively poling the piezoelectric material to produce poled and unpoled regions, and by control of electrode geometry. The shading of a phased array ultrasonic transducer is described in both lateral dimensions.

REFERENCES:
patent: 2411551 (1946-11-01), Mason
patent: 2427062 (1947-09-01), Massa
patent: 2837728 (1958-06-01), Schuck
patent: 2875355 (1959-02-01), Petermann
patent: 2928068 (1960-03-01), Samsel et al.
patent: 2956184 (1960-10-01), Pollack
patent: 4271490 (1981-06-01), Minohara et al.
patent: 4287770 (1981-09-01), Weyns
patent: 4291396 (1981-09-01), Martin
patent: 4305014 (1981-08-01), Borburgh et al.

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