Apparatus for calibrating an optical null spectrophotometer

Details Apparatus for calibrating an optical null spectrophotometer Apparatus for calibrating an optical null spectrophotometer

1976-07-02

1978-07-18

Corbin, John K.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250214L, 324132, G01J 342, G01R 1510

Patent

active

041012194

ABSTRACT:
A double beam optical null spectrophotometer having sample and reference optical beam paths, a detector common to both paths, and an attenuator feedback loop from the detector for adjusting the position of an optical attenuator in the reference beam path to balance the energy in the two paths. The slider of an attenuator transmitting potentiometer follows the position of the optical attenuator and a signal level sensitive impedance network connected to the slider calibrates the potentiometer such that an output signal therefrom indicates the true transmittance of a sample in the sample beam path over a range of transmittance values from zero to one hundred percent transmittance.

REFERENCES:
patent: 2492901 (1949-12-01), Sweet
patent: 2658180 (1953-11-01), Boisblanc
patent: 3504977 (1970-04-01), Matthews
patent: 3525942 (1970-08-01), Boronkay et al.

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