Method and apparatus for focusing elastic waves converted from t

Details Method and apparatus for focusing elastic waves converted from t Method and apparatus for focusing elastic waves converted from t

1979-05-18

1981-05-26

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

042690676

ABSTRACT:
Pulsed light is applied through a plano concave lens to a thin metal film, which is evaporated on the concave side of the lens. The lens, which is formed of a high thermally insulating material such as glass, for example, and the film are disposed within a liquid such as water, for example. The pulsed light is absorbed by the metal film, which converts the thermal energy produced by the pulsed light into elastic waves in the form of acoustic waves and simultaneously focuses the acoustic waves on an object within the water at a selected focal plane. The metal film is as thin as possible, consistent with complete absorption of the light energy by the metal film, so as to utilize the high thermal expansion coefficient of the water.

REFERENCES:
patent: 3269173 (1966-08-01), Von Ardenne
patent: 3322231 (1967-05-01), Gournay
patent: 3532181 (1970-10-01), Demaria et al.
patent: 3583212 (1971-06-01), Nanney et al.
patent: 3903990 (1975-09-01), Tannaka
patent: 4084582 (1978-04-01), Nigam
patent: 4137991 (1979-02-01), Melcher et al.
R. M. White, "Generation of Elastic Waves by Transient Surface Heating", Journal of Applied Physics, vol. 34, No. 12, pp. 3559-3567, Dec. 1963. _

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