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STUDY OF THE INTERACTION BETWEEN PHOTOCATHODES AND TARGET PLATES
WESTINGHOUSE ELECTRIC CORP ELMIRA N Y
Effort was concentrated on the use of thin aluminum oxide films for storage target plates in image orthicons. These films are extremely rugged and adaptable to various modifications. Ruggedized tubes made using these films meet or exceed the 10g vibration tests of MIL-E-5272 with no image degradation. In standard 30 frame per second scanning systems, these Image Orthicons with S-10 photocathodes produced 100 T.V. line images with only 10 to the -6th power foot candles incident on the photocathode. Tubes with multi-alkali S-20 photocathodes produced 200 T.V. line images with 8.3 x 10 to the -7th power foot candles on the photocathode. These tubes will store 600 line images for times longer than 10 seconds. Secondary emission gains of six were measured. Performance of these aluminum oxide storage targets compares exactly to that obtained in tests of tubes with magnesium oxide target plates. Reasons for the substantial sensitivity improvement over glass target tubes are discussed. Author
AF33 616 6422