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Proceedings Paper

Geometrical Optics Analysis Of A Retroreflector System Of Concentric Hemispherical Mirrors
Author(s): Helmut E. Schrank
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Paper Abstract

A concave hemispherical mirror with a segment of a smaller concentric spherical mirror at the paraxial focal region of the larger mirror can be used as a retroreflector having some advantages over the commonly used corner reflector, i.e. wider angular response and lighter weight, the latter because no glass or other dielectric is required. Such a device has been successfully designed and built for microwave applications,4 and may also have utility for infra-red or optical systems requiring echo�enhancement. To determine the optimum radius of the smaller reflector relative to the larger hemisphere, a geometric optics analysis was performed with the aid of a UNIVAC 1107 computer. This gave a better understanding of the effects of spherical aberration on the echoing performance of the reflector system and helped to determine the size of the smaller reflector which gives the best compromise between reflectivity and aperture blockage.

Paper Details

Date Published: 1 March 1974
PDF: 4 pages
Proc. SPIE 0039, Applications of Geometrical Optics II, (1 March 1974); doi: 10.1117/12.953790
Show Author Affiliations
Helmut E. Schrank, Westinghouse Electric Corporation (United States)

Published in SPIE Proceedings Vol. 0039:
Applications of Geometrical Optics II
Warren J. Smith, Editor(s)

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