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Proceedings Paper

Holographic Moving Map Display
Author(s): B. R. Clay; D. A. Gore
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Paper Abstract

A high brightness display is achieved using tungsten sources to read out phase image plane holograms. Full color is provided by using three superimposed component holograms derived from three primary color separation object transparencies of the original subject. The holograms are contained on transparent plastic tape which is surface modulated by embossing from electro-plated masters. Any frame on the tape can be retrieved rapidly by means of the superimposed frame address Fraunhofer binary holograms which use a gallium arsenide laser to reconstruct the image on a silicon diode array. The system lends itself to post-embossing annotation. Reference Fresnel holograms recorded on each frame enable the frame to be positioned in X and Y so as to allow the map image to be driven in response to navigational tracking requirements. Because incident readout light is modulated by diffraction rather than absorption, the holograms do not rise in temperature as a result of the conversion of light to heat. This feature enables condiderably more light flux to be gated by the holograms than could be gated by any other medium of the same area. The resulting image brightness is adequate for viewing in the high ambient light environments. Since the production of color involves diffraction rather than absorption by dyed emulsion, bleaching with consequent color degradation cannot occur.

Paper Details

Date Published: 1 October 1974
PDF: 8 pages
Proc. SPIE 0045, Coherent Optics in Mapping, (1 October 1974); doi: 10.1117/12.953958
Show Author Affiliations
B. R. Clay, RCA Corporation (United States)
D. A. Gore, RCA Corporation (United States)

Published in SPIE Proceedings Vol. 0045:
Coherent Optics in Mapping
N. Balasubramanian; Robert D. Leighty, Editor(s)

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