Acoustic lens

Details Acoustic lens Acoustic lens

1993-09-23

1994-09-06

Gellner, Michael L.

Acoustics

Sound-modifying means

Lens

367150, G01K 1100

Patent

active

053450450

ABSTRACT:
An acoustic lens for the transformation of a planar wave into a spherical segment-shaped wave, and vice versa, is disclosed. In order to avoid aberrations, the lens is fashioned rotationally symmetrical relative to its center axis and biconcavely, the lens surface adjoining the medium in which the planar wave propagates is produced by the rotation of a section of a straight line, the lens surface adjoining the medium in which the spherical segment-shaped wave propagates is produced by the rotation of a section of an ellipse, and the angle between the straight line and the center axis as well as the angle between the major half-axis of the ellipse and the center axis are selected such that a planar or spherical segment-shaped wave entering into the lens propagates in the lens as a conical wave whose aperture angle is equal to double the angle at which the minor half-axis of the ellipse intersects the center axis.

REFERENCES:
patent: 3620326 (1971-11-01), Hogge
patent: 3982223 (1976-09-01), Green
patent: 4553629 (1985-11-01), Sternberg
patent: 4629030 (1986-12-01), Ferralli
patent: 4844198 (1989-07-01), Feralli
patent: 5269292 (1993-12-01), Granz et al.
"Das Elektromagnetische Stosswellensystem von Siemens," buchholtz et al., Siemens AG, Bereich Medizinische Technik, Nov., 1991, pp. 29-33.

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