F - Mech Eng,Light,Heat,Weapons – 41 – G
Patent
F - Mech Eng,Light,Heat,Weapons
41
G
F41G 7/20 (2006.01) H04N 7/18 (2006.01)
Patent
CA 2066391
OPTIMAL TELEVISION IMAGING SYSTEM FOR GUIDED MISSILE ABSTRACT OF THE DISCLOSURE 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 from 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 attenuation 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).
Baker Leland R.
Golden Lewis J.
Hughes Aircraft Company
Sim & Mcburney
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