Spectrophotometer with photomultiplier tube dark signal compensa

Details Spectrophotometer with photomultiplier tube dark signal compensa Spectrophotometer with photomultiplier tube dark signal compensa

1979-10-19

1982-01-12

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

250207, 330 9, 330259, 356323, 356325, 356326, G01J 300, G01J 144, H01J 4014

Patent

active

043102433

ABSTRACT:
In a spectrophotometer including a photomultiplier tube and an operational amplifier responsive to the current from the photomultiplier tube for generating a DC voltage proportional to light intensity, a method and means for simultaneously compensating for the dark current of the photomultiplier tube and the offset of the operational amplifier so that the output voltage of the operational amplifier is zero volts under dark conditions.

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

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