Method and apparatus for overload protection for a photomultipli

Details Method and apparatus for overload protection for a photomultipli Method and apparatus for overload protection for a photomultipli

1993-05-28

1995-03-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214VT, 313533, H01J 2952, H01J 4014

Patent

active

054019516

ABSTRACT:
An overload protection circuit for a photomultiplier tube. A light source illuminates a photomultiplier tube which produces a signal proportional to the incoming radiation which is sent to photon counting electronics. The photon counting electronics produces a signal in proportion to the input photons to the photomultiplier tube and also provides an output to a frequency to voltage converter. The frequency to voltage converter is used to modulate a high voltage amplifier which controls the output of the photomultiplier tube. When the photon counting electronics indicate to the frequency to voltage converter that the photons produced by the photomultiplier tube exceed a predetermined maximum the high voltage amplifier reduces the gain of the photomultiplier tube. The gain of the photomultiplier tube is gradually reduced in proportion to the incident light level.

REFERENCES:
patent: 3435233 (1969-03-01), Farnsworth
patent: 3714441 (1973-01-01), Kreda
patent: 3821546 (1974-06-01), McClenahan
patent: 4091277 (1978-05-01), Doblhofer
patent: 4436994 (1984-03-01), VanVilet et al.
patent: 4804891 (1989-02-01), Sweeney
patent: 4820914 (1989-04-01), Allen

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