Accession Number : AD0912078

Title :   Reduction of Veiling Glare in Electro-Optical Image Tubes.

Descriptive Note : Final rept. 1 Apr 72-28 Feb 73,

Corporate Author : ITT ELECTRO-OPTICAL PRODUCTS DIV FORT WAYNE IN

Personal Author(s) : Eberhardt, Edward H. ; Cretsinger, Donald D.

Report Date : MAY 1973

Pagination or Media Count : 81

Abstract : Using an image dissector scanner as an electronic microphotometer, the absolute magnitude of veiling glare was measured in a series of production image tubes. In general, the measured total veiling glare levels varied from 1 to 5% (1 to 5% of the true image flux appearing in non-image areas at the output). In addition, significant differences were observed between tube types in the distribution of this veiling glare over the image field. Interpretation of the results indicated that second generation microchannel plate wafer tubes could be expected to show markedly superior performance under 'bright source' interfering conditions, whereas first generation electrostatic and magnetic image tubes should be superior for reconnaissance photography, where maximal system contrast transfer is required. The sources of veiling glare were sufficiently well-determined so that recommendations could be made as to appropriate procedures for reducing veiling glare. (Author)

Descriptors :   (*IMAGE TUBES, PERFORMANCE(ENGINEERING)), (*PHOTOGRAPHIC RECONNAISSANCE, RESOLUTION), IMAGE INTENSIFIERS(ELECTRONICS), TRANSFER FUNCTIONS, BRIGHTNESS, PHOTOCATHODES, LIGHT TRANSMISSION, ELECTROOPTICS, ELECTRON OPTICS, SCATTERING, SECONDARY EMISSION, ELECTRONS, CATHODE RAY TUBE SCREENS, ELECTRONIC SCANNERS, FOCUSING, ELECTRON LENSES, MAGNETIC FIELDS, STATIC ELECTRICITY, ELECTRON MULTIPLIERS, EYEGLASSES, NIGHT VISION.

Subject Categories : Electrooptical and Optoelectronic Devices
      Military Intelligence

Distribution Statement : APPROVED FOR PUBLIC RELEASE