Abstract: An infrared detector and imaging system responsive to the scanned image from an objective lens and scanner system, the infrared detector and imaging system comprising: a detector substrate; a sparsely populated staggered detector array formed on the detector substrate, the detector substrate having a focal plane surface receiving the scanned image from the objective lens and scanner system. A clock means provides clock signals. A control signal means is responsive to the clock signal for providing a sequence of predetermined scanner position signals. A servo responsive to each scanner position signal commands the scanner means to locate the scanned image at predetermined positions on the focal plane. A detector signal integration means receives and integrates an array of detector signals from the sparsely populated detector array.

Abstract: A linear optical scanner adapted to receive light rays from object space, the light rays passing through the linear optical scanner in image forming relation, the linear optical scanner being adapted to periodically and reciprocally deflect the collimated light rays through a predetermined angle. The periodically and reciprocally deflected collimated light rays leave the linear optical scanner and passing through an objective lens system to an image plane. The objective lens system has an optical axis incident on the image plane and is adapted to focus the periodically and reciprocally deflected collimated light rays to form a periodically and reciprocally displaced image on the image plane.

Abstract: An infrared lens system for projecting an image from object space onto a flat image plane, the lens system being corrected over the spectral region of 3.3 to 4.2 microns and having a selectable narrow field of view comprising: an objective lens system having a plurality of lens elements formed of material optically transparent over the spectral region of 3.3 to 4.2 microns, the plurality of lens elements being coaxially aligned and adapted to receive light from object space and to form an image on the flat image plane, a selectable afocal telescope, the selectable afocal telescope being in select field of view determining relation with the objective lens system, whereby upon selection, the selectable afocal telescope cooperates with the objective lens system to provide a narrow field of view.

Abstract: A selectable field-of-view infrared lens is disclosed for projecting an image from object space onto a flat image plane, the selectable field-of-view infrared lens being corrected over the spectral region of 3.3 to 4.2 microns and having a selectable wide field-of-view comprising: an objective lens system having a plurality of lens elements formed of material optically transparent over the spectral region of 3.3 to 4.2 microns; a selectable refractive Galilean afocal telescope having a plurality of lens elements formed of material optically transparent over the spectral region of 3.3 to 4.

Abstract: A four element infrared lens design is provided having lenses of crystalline semiconductor materials such as silicon and germanium. The system is designed to have an f/1.5 speed corrected over the spectral region of 3.3 to 4.2 microns, and to reduce field curvature produced by projecting an image on a flat detector. A particular object of the design is to minimize the effect of narcissus and loss of resolution.