Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1985-03-29
1987-04-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313533, H01J 4014
Patent
active
046616934
ABSTRACT:
A photomultiplier control circuit includes a circuit for receiving an output signal of a photomultiplier, which detects a light to be measured and converts the detected light to an electric signal in order to generate an output depending on a level of the light to be measured. A light source is used for applying a compensating light to the photomultiplier and a circuit is provided for detecting an average anode current of the photomultiplier. A comparison circuit compares outputs of both circuits and generates the resulting difference output. A control circuit controls the intensity of a light emitted from the light source based on the difference output. The circuit is capable of stabilizing gain fluctuations of a photomultiplier when the incident light is input thereto in the form of a direct current, and also capable of maintaining the accuracy of a photomultiplier when it is employed in measuring tools, etc.
REFERENCES:
patent: 3611042 (1971-10-01), Boronkay
patent: 4310243 (1982-01-01), Brown et al.
patent: 4563707 (1986-01-01), Kishida
Radioisotopes, vol. 28, No. 7, Jul. 1979, Shigeru Kataoka et al. (pertinent portions translated).
Kabushiki Kaisha Toshiba
Nelms David C.
Oen William L.
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