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Proceedings Paper

A Spectrally Selective Shutter In Proximity To Focal Plane
Author(s): Edward F. Cross; Gary D. Wiemokly
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Paper Abstract

This paper describes a repetitive spectrally selective shutter that can be installed between the optics and the focal plane to eliminate the requirement for covering the entire optical aperture with a large revolving filter. The optomechanical method used provides rapid "snap-shot" imagery by varying the tilt angle of one or two narrow-bandpass filters, v) that open aperture occurs only when their spectral transmission bands coincide. An optical design configuration allows the spectral shuttering to be performed in the same location normally designated for a chopper wheel. Under these conditions, spectral filter size needs only to encompass focal plane dimensions, rather than match optical aperture diameter as previously required. Ray trace diagrams and graphic plots of transmission versus time and angle are presented which analytically predict the effectiveness of this technique. These results are further substantiated by experimental data obtained in the laboratory. In addition, geometrical, dimensional, and material requirements for optimum two-filter performance are analyzed in detail, together with allowable tolerances.

Paper Details

Date Published: 23 February 1985
PDF: 8 pages
Proc. SPIE 0572, Infrared Technology XI, (23 February 1985); doi: 10.1117/12.950690
Show Author Affiliations
Edward F. Cross, The Aerospace Corporation (United States)
Gary D. Wiemokly, The Aerospace Corporation (United States)

Published in SPIE Proceedings Vol. 0572:
Infrared Technology XI
Richard A. Mollicone; Irving J. Spiro, Editor(s)

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