Optical filtering device

Details Optical filtering device Optical filtering device

G - Physics

02

B

G02B 5/26 (2006.01) G01J 3/02 (2006.01) G01J 3/16 (2006.01) G02B 5/20 (2006.01)

Patent

CA 2101176

An optical filtering device incorporates first and second prisms, the latter prism counteracting the angular dispersion of the former prism. A spatial light modulator provides a positionally variable optical stop located to block radiation within a wavelength interval and received from a location within a scene. Unobscured radiation from that and other scene locations passes to a camera, which produces an image on a display. Opaque pixels in the stop are positioned to block unwanted light sources. The invention attenuates potentially dazzling monochromatic radiation while retaining radiation at other wavelengths for imaging purposes.

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