Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-08-31
1996-06-11
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214AG, 25036309, 313535, 315383, G01T 1208, H01J 4014
Patent
active
055257941
ABSTRACT:
An electronic gain control is disclosed for the photomultipliers of a gamma camera which assures that all photomultipliers in the camera have uniform gain for any given ganuna event. A specific dynode in the photomultiplier is isolated from the line resistive voltage divider string in the photomultiplier which places each dynode under incremental voltages. A voltage is then applied to the isolated dynode which can vary anywhere from the voltage the isolated dynode would have had if inserted in the voltage divider string to the voltage that the immediately preceding or immediately succeeding dynode in the string has whereby the photomultiplier's gain is controlled. The applied voltage to the isolated dynode is developed electronically by a voltage to frequency converter coupled by an opto-isolator to a gain voltage divider circuit which cycles the applied voltage between two different voltage potentials tapped from the voltage divider string. The voltage to frequency converter is controlled by individual gain signals developed and stored during calibration of the camera for each photomultiplier.
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Lee John R.
Nawalanic Frank J.
Summit World Trade Corp.
Westin Edward P.
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