Reduction of Veiling Glare in Electro-Optical Image Tubes.
Final rept. 15 May 73-15 Apr 75,
ITT ELECTRO-OPTICAL PRODUCTS DIV FORT WAYNE IND
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Several techniques for measuring veiling glare in image tubes are identified and the merit of each discussed. The half-field method is determined and the merit of each discussed. The half-field method is determined to be most advantageous and a detailed discussion of this method is included. Veiling glare is described in two regions having different slope of intensity profile away from the half-field terminator. The more sharply falling region is identified as near-field veiling glare and the nearly constant background extending essentially over the full dark field is the far-field veiling glare. Because of observation limitations, near-field veiling glare values have probable error as high as plus or minus 50. Four types of image tubes were fabricated and evaluated for veiling glare characteristics. The emphasis was to determine the effectiveness of blackening of internal surfaces as a means of reducing veiling glare.
- Electrooptical and Optoelectronic Devices