US Government as Represented by the Secretary of the Army

Andrew J Dotson

John M Hall

Richard A Wright

Brian J Kowalewski

Brian D Kellermeyer

The current invention describes a compact objective lens with enhanced distortion for near-infrared imaging, comprising a positively powered, aspheric, and meniscus first lens element; a negatively powered, aspheric, and meniscus second lens element; a positively powered, aspheric, and biconvex third lens element; a negatively powered, aspheric, and meniscus fourth lens element; a negatively powered, aspheric, and meniscus field corrector element; and a detector assembly comprising a window and a detector plane where the light rays come to focus.

Compact objective lens with enhanced distortion for near-infrared imaging

A multiple field of view dual band optical device with integrated calibration source is disclosed. Such an optical device is modular, and has a rotating electro-mechanical 'tumbler' which houses two orthogonal Galilean afocal optical assemblies as well as at least one uniform temperature source. This modular device is intended to be inserted in front of a camera system which already has an imager optical assembly mated to a detector focal plane array. The disclosed modular device thus serves the purpose of providing to an existing dual-band camera imager up to four new optical fields of view as well as an integral calibration source, all of which can be electro-mechanically selected for viewing by a host camera imager.

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Washington, DC, United States of America

Andrew J Dotson