Method and apparatus for overload protection for a photomultiplier tube
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United States of America Patent
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Mar 28, 1995
Grant Date -
N/A
app pub date -
May 28, 1993
filing date -
May 28, 1993
priority date (Note) -
Expired
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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.
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