Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1979-12-19
1982-04-27
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358139, H04N 962
Patent
active
043273718
ABSTRACT:
A method and apparatus for quickly and easily calibrating a relatively unstable light detector, such as a photomultiplier tube. The system is particularly designed to effect large scale semi-automatic calibration of many photomultiplier tube-preamplifier combinations that may exist in, for example, a laser scanner system. Each preamplifier (10) includes an automatic gain control circuit (20) connected in a loop which is momentarily closed during a calibrate mode when a predetermined level of a calibrated light source (15) is directed upon the associated tube (12). An error amplifier (34) develops a voltage in accordance with the deviation of the video output of the tube from the expected level during calibration, and the error voltage is preferably stored in digital form (38) so that the gain of the preamplifier (10) may be maintained at the calibrated level between successive calibrations. The calibrated light source (15) is chopped to provide alternating bright cycles and dark cycles during the calibration mode. The preamplifiers are calibrated during the bright cycles, while the dark cycles are utilized to restore the direct current level of the video output signal, which restoration occurs in normal operation during horizontal blanking of the video system.
Edson Alvin W.
Windyka Richard A.
Kaufman Stephen C.
Murray Richard
The Singer Company
LandOfFree
Method and apparatus calibrating a plurality of preamplifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus calibrating a plurality of preamplifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus calibrating a plurality of preamplifiers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2200453