A Spectrally Selective Shutter In Proximity To Focal Plane

Edward F. Cross; Gary D. Wiemokly

doi:10.1117/12.950690

23 February 1985 A Spectrally Selective Shutter In Proximity To Focal Plane

Edward F. Cross, Gary D. Wiemokly

Proceedings Volume 0572, Infrared Technology XI; (1985) https://doi.org/10.1117/12.950690
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

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.

Citation Download Citation

Edward F. Cross and Gary D. Wiemokly "A Spectrally Selective Shutter In Proximity To Focal Plane", Proc. SPIE 0572, Infrared Technology XI, (23 February 1985); https://doi.org/10.1117/12.950690

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