Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-10-24
1997-08-26
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214A, 327515, H01J 4014
Patent
active
056612931
ABSTRACT:
A solid-state radiation detector, including a photodiode array, is suitable for use in computed tomography, with the dark current of the photodiodes being compensated. The compensation is accomplished by an adjustable voltage source connected to the photodiode, the voltage of the adjustable voltage source being set by a regulator so that the dark current becomes zero. The regulator receives a signal corresponding to the dark current from a measured value transducer in the form of a current-driven voltage source. The voltage supplied by the adjustable voltage source to the photodiode is maintained constant while x-rays are incident on the overall detector which cause illumination of the photodiode.
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patent: 4933543 (1990-06-01), Hill
patent: 5296697 (1994-03-01), Moses, Jr.
"Method of Compensating Dark Current Photodiode Arrays", Korth, IBM Technical Disclosure Bulletin, vol. 22, No. 8B, Jan. 1980.
Lindner Rolf
Ziegler Roland
Pyo Kevin
Siemens Aktiengesellschaft
Westin Edward P.
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