Accession Number : AD0692740

Title :   CONVOLUTION OF PHOSPHOR RESPONSES OCCURRING IN CASCADED IMAGE INTENSIFIER TUBES AND RELATED SUBJECTS.

Descriptive Note : Final scientific rept.,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Gebel,Radames K. H.

Report Date : MAY 1969

Pagination or Media Count : 14

Abstract : The convolution of the phosphor responses of several cascaded image convertor tubes is employed as an image time delay for gaining the time needed to operate threshold controllable gating devices designed to protect highly fragile television image transducer tubes, et., against randomly occurring highly intense light flashes, etc.; the protective gating also blanks out the flashes in the reproduced image and thus prevents kinescope recordings from being accidentally overexposed by these flashes. The blanking in the reproduced image may not be visually noticeable or, in the case of longer blanking durations, be much less annoying to the observer than the bright flashes. In a more sophisticated device, one may substitute blanked-out frames with the last undisturbed frame, utilizing a storage device. Typical overall responses resulting from the convolution of several phosphors, and a typical block schematic showing a protective arrangement which also is capable of frame substitution, are shown. (Author)

Descriptors :   (*IMAGE ORTHICONS, IMAGE INTENSIFIERS(ELECTRONICS)), (*LIGHT PULSES, PROTECTION), TRANSIENTS, RANGE GATING, PHOSPHORESCENT MATERIALS, PHOTOCATHODES

Subject Categories : Electrooptical and Optoelectronic Devices
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE