Resolution transducers, systems and methods for the transmission

Details Resolution transducers, systems and methods for the transmission Resolution transducers, systems and methods for the transmission

1982-02-17

1985-04-02

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Signal transducers

310357, 310365, 367103, B06B 102

Patent

active

045091536

ABSTRACT:
Problems of resolution and focussing arise in the near field in systems employing radiation, including ultrasonic systems. These problems can be alleviated by suppressing the plane waves in the combination of plane waves and edge waves usually employed. Several ultrasonic transducers with this property are described and in one a piezoelectric disc with surface electrodes is non-linearly polarized to transmit edge waves without plane waves.

REFERENCES:
patent: 2928068 (1960-03-01), Samsel et al.
patent: 2956184 (1960-10-01), Pollack
patent: 3918024 (1975-11-01), Macovski
patent: 3974475 (1976-08-01), Burckhardt et al.
patent: 4052693 (1977-10-01), Gilmour
patent: 4069467 (1978-01-01), Burckhardt et al.
patent: 4241611 (1980-12-01), Specht et al.

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