Acoustic lens system

Details Acoustic lens system Acoustic lens system

1994-06-13

1996-01-09

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73606, 367150, G01N 2906, G01N 2924

Patent

active

054819180

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 favorably 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: 3618696 (1971-11-01), Hurwitz
patent: 3735336 (1973-05-01), Long
patent: 3866711 (1975-02-01), Folds
patent: 3903909 (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.
W. L. Beaver et al., "Ultrasonic Imaging With An Acoustic Lens", IEEE Transactions on sonics and Ultrasonics, vol. SU-24, No. 4, Jul. 1977, pp. 235-243.
T. Szilard and M. Kidger, "A new ultrasonic lens", Ultrasonics, Nov. 1976 (73/642), pp. 268-272.

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