Acoustic variable focal length lens assembly

Details Acoustic variable focal length lens assembly Acoustic variable focal length lens assembly

1980-01-04

1981-01-06

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

042429137

ABSTRACT:
A lens assembly exhibiting a certain fixed relative aperture is comprised of a physical acoustic lens having a given physical aperture and a fixed relatively short focal length serially spaced from an electronic acoustic lens having any selected one of a plurality of different relatively long focal lengths and simultaneously controlling the physical aperture of the electronic acoustic lens such that the relative aperture of the assembly as a whole remains fixed regardless of the selected one of the long focal lengths. Such a lens assembly is suitable for use in a pulse-echo ultrasonic-imaging system for imaging a deep structure.

REFERENCES:
patent: 3936791 (1976-02-01), Kossoff
patent: 4019169 (1977-04-01), Takamizawa
patent: 4058003 (1977-11-01), Macovski
patent: 4080838 (1978-03-01), Kuroda et al.
patent: 4131022 (1978-12-01), Mezrich

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