Spectrophotometer with improved photomultiplier tube dark signal compensation
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United States of America Patent
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-
Jul 21, 1981
Grant Date -
N/A
app pub date -
Oct 19, 1979
filing date -
Oct 19, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a spectrophotometer including a photomultiplier tube responsive to light for producing an analog current proportional to the intensity thereof, an analog-to-digital converter, a signal path from the photomultiplier tube to the analog-to-digital converter, the analog-to-digital converter producing a digital signal as a function of the analog current, and computer means responsive to the digital signal for generating a signal for compensating for the dark current of the photomultiplier tube, there is disclosed a method and means for reducing the dark current correction error by temporarily increasing the gain of the signal path during calculation of the value of the compensating signal.
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