Gain control of photomultiplier tubes used in detecting differen

Details Gain control of photomultiplier tubes used in detecting differen Gain control of photomultiplier tubes used in detecting differen

1988-01-20

1989-04-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313533, H01J 4014

Patent

active

048209147

ABSTRACT:
A technique for controlling the gain of a photomultiplier tube (PMT) 20. A voltage divider (resistors 45-49 in FIG. 1 and zener diodes 60-65 in FIG. 3) is used to control the potentials on dynodes 5, 7, and 9 of PMT 20. Transistor switches 53 and 58 provide the control of the voltage divider in FIG. 1 and photodiodes 66, 67 and 70 provide the control in FIG. 3. The gain control of PMT 20 is in the range from 100% to less than 0.001% (100,000 to 1).

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Allen, R. J. and W. E. Evans, The Review of Scientific Instruments, "Laser Radar (LIDAR) for Mapping Aerosol Structures," vol. 43, No. 10, Oct. 1972, pp. 1422-1432.
Barrick, John D. W. "Gating Characteristics of Photomultiplier Tubes for LIDAR Applications." NASA Technical Memorandum 87699, Aug. 1986.

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