Pulse-echo ultrasonic-imaging display system having time-varied

Details Pulse-echo ultrasonic-imaging display system having time-varied Pulse-echo ultrasonic-imaging display system having time-varied

1977-10-20

1979-09-25

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

73626, 128660, G01N 2900

Patent

active

041686284

ABSTRACT:
A transducing unit comprising a central section, detecting echoes returned through only a small portion of a relatively large aperture lens, surrounded by an annular section, detecting echoes returned through the remainder of the aperture, provides detected signals from the respective central and annular sections which are selectively utilized during respective specified time intervals in accordance with the operation of time-controlled switches to thereby change the effective depth of focus of the lens as a function of time.

REFERENCES:
patent: 3937066 (1976-02-01), Green et al.
patent: 4012952 (1977-03-01), Dory
patent: 4016750 (1977-04-01), Green

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