Ultrasonic imaging system

Details Ultrasonic imaging system Ultrasonic imaging system

1977-07-20

1979-07-17

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

128660, G01N 2900

Patent

active

041611217

ABSTRACT:
An electrical-to-acoustic wave transducer contains an array of piezoelectric elements connected to wave-delay circuits to generate a directed acoustic beam and to receive a similarly directed, reflected beam. The distance of a reflecting object is sensed by the time delay of the reflected wave. The apparatus is adapted to sense reflections from both the Fresnel region and the far-field of the array. During the time when reflections from nearby objects in the Fresnel region are received, the effective aperture of the array is reduced by disconnecting elements near its extremities or reducing their gain, producing a narrower beam for improved angular resolution.

REFERENCES:
patent: 3881164 (1975-04-01), Kossoff
patent: 3881466 (1975-05-01), Wilcox
patent: 3911730 (1975-10-01), Niklas
patent: 3936791 (1976-02-01), Kossoff

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