Automatic loop gain adjustment for optical null spectrophotomete

Details Automatic loop gain adjustment for optical null spectrophotomete Automatic loop gain adjustment for optical null spectrophotomete

1978-02-24

1979-12-04

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

G01J 342

Patent

active

041769589

ABSTRACT:
A double beam, optical null spectrophotometer including means for automatically determining system loop gain requirements and setting the gain to the correct value for optimum response under all operating conditions. With the system ready for operation and a sample in the sample beam path, a difference signal is generated as a function of the position of a reference beam attenuator with and without a small unbalancing signal applied to the system loop. This difference signal is compared to a desired difference signal and a loop gain adjustment is made so that the difference signal will equal the desired difference signal, thereby establishing instrument gain for optimum response.

REFERENCES:
patent: 3790283 (1974-02-01), Way et al.

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