Reduction of Veiling Glare in Electro-Optical Image Tubes.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1973
- Accession Number
- AD0912078
Entities
People
- Donald D. Cretsinger
- Edward H. Eberhardt