Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-11-18
1994-01-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250207, G01J 132
Patent
active
052801667
ABSTRACT:
Two photomultipliers (14,16) are arranged one on either side of a CRT (10) primary optical axis adjacent the imaging lens. High frequency components of the detected CRT brightness signal from the two photomultipliers are applied to the "gate" 32. When the signals are equal, one or other of the signals will be selected by the "gate". When the signals are unequal, the lower one will be rejected. Thus signals caused by faceplate (22) dirt are eliminated, since they appear displaced in time from the photomultipliers, due to the spacing of the dirt from the scanning beam and the spacing of the photomultipliers. Phosphor grain and blemish signals occur at the outputs of the photomultipliers simultaneously and are allowed through the "gate" to provide correction and attenuation of these unwanted signals.
REFERENCES:
patent: 3917974 (1975-11-01), Lucchesi et al.
patent: 3949226 (1976-04-01), Dugan et al.
patent: 3992620 (1976-11-01), Waller
IBM Technical Disclosure Bulletin, vol. 5, No. 9 (1963) pp. 110 to 111 K. M. Trampel and H. H. Jensen, "Calibration of Photographic Scanning System".
Nelms David C.
Rank Cintel Limited
LandOfFree
Flying spot scanner burn corrector with dual photomultiplier sam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flying spot scanner burn corrector with dual photomultiplier sam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flying spot scanner burn corrector with dual photomultiplier sam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1137677