Optimal television imaging system for guided missile

Details Optimal television imaging system for guided missile Optimal television imaging system for guided missile

1991-06-24

1992-09-01

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 81, 358103, H04N 718

Patent

active

051444224

ABSTRACT:
A lens assembly (30) focusses an optical image of a field of view (20) forward of a guided missile (12) onto a photosensitive target layer (50) of a television camera tube (52). The target layer (50) includes sublayers of zinc selenide (ZnSe) and cadmium telluride (CdTe)/zinc telluride (ZnTe), and has a spectral sensitivity range which extends for approximately 400 to 900 nanometers. A red filter (68) is provided to attenuate wavelengths shorter than 600 nanometers in the optical image to increase target contrast by reducing blue scattered light created by Rayleigh and aerosol scattering. The lack of response of the camera tube (52) to wavelengths longer than 900 nanometers further increases target contrast by reducing background radiation from soil and vegetation. A motorized variable iris diaphragm (56) is provided in the lens assembly (30) to automatically adjust the intensity of the optical image such that the television tube (52) generates an electronic image with constant brightness although the brightness of the field of view (20) may vary considerably. The diaphragm (56) has a high attentuation range on the order of 800:1 to accommodate a wide image brightness range. A neutral density gradient filter (70) having an optical density which decreases radially from the center toward the periphery thereof is mounted adjacent to the iris diaphragm (56) to increase the dynamic range of the diaphragm assembly (56).

REFERENCES:
patent: 3536402 (1970-10-01), Aston
patent: 3571649 (1971-03-01), Bush, Jr.
patent: 4814868 (1989-03-01), James
patent: 5013917 (1991-05-01), Ulich

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