Spectrophotometer with improved photomultiplier tube dark signal

Details Spectrophotometer with improved photomultiplier tube dark signal Spectrophotometer with improved photomultiplier tube dark signal

1979-10-19

1981-07-21

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

250207, 356326, 330129, 330259, 356300, G01J 300

Patent

active

042795109

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.

REFERENCES:
patent: 2253976 (1941-08-01), Guanella
patent: 3684378 (1972-08-01), Lord

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