External calibration system for a photo multiplier tube
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United States of America Patent
Stats
-
Jan 18, 2000
Issued Date -
N/A
app pub date -
Dec 18, 1997
filing date -
Nov 22, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An external calibration system for a photo multiplier tube is described. The calibration system uses a light emitting diode and a photo cell wherein the diode is domed shaped. The light sensitive face of the photo multiplier tube is contained in the plane disposed at an acute angle to the longitudinal axis of the light emitting diode, and the photo cell is mounted substantially perpendicular to the longitudinal axis. A source of electrical energy then illuminates the light emitting diode over a range from, for example, 0 to 5 volts to generate light of known intensity and the light being generated is simultaneously measured by the photo cell and the light sensitive face of the photo multiplier tube. A feedback circuit is provided and associated circuitry so that a number of readings can be taken over a wide variety of light intensities to generate a calibration for the photo multiplier tube.
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