Acoustic lens system

Details Acoustic lens system Acoustic lens system

1991-04-03

1994-08-02

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73606, 367150, G01N 2906, G01N 2924

Patent

active

053335031

ABSTRACT:
An acoustic lens system is constructed so that at least one surface of acoustic lenses constituting the acoustic lens system is an aspherical surface, which has such a shape that curvature moderates progressively in separating from the axis of the acoustic lens system, and an acoustic beam stop is provided therein. As a result, aberrations can be favorable corrected even when the angle of view and the numerical aperture are increased and this brings about the acoustic lens system suitable for an objective lens of an acoustic system for securing an image of an object having a two-dimensional size in particular.

REFERENCES:
patent: 3618692 (1971-11-01), Hurwitz
patent: 3620326 (1971-11-01), Hogge
patent: 3866711 (1975-02-01), Folds
patent: 3903990 (1975-09-01), Tannaka
patent: 3958559 (1976-05-01), Glenn et al.
patent: 3982223 (1976-09-01), Green
patent: 4001766 (1977-01-01), Hurwitz
patent: 4183249 (1980-01-01), Anderson
patent: 4332018 (1982-05-01), Sternberg et al.
patent: 4409839 (1983-10-01), Taenzer
patent: 4457175 (1984-07-01), Ramsey, Jr. et al.
IEEE Transactions on sonics and Ultrasonics, vol. SU-24, No. 4, Jul. 1977, pp. 235-243 "Ultrasonic Imaging with an Acoustic Lens" W. L. Beaver et al.
"A new ultrasonic lens" by J. Szilard and M. Kidger, Ultrasonics, Nov. 1976, pp. 268-272.

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