Cross-talk balancing circuit for spectrophotometers

Details Cross-talk balancing circuit for spectrophotometers Cross-talk balancing circuit for spectrophotometers

1976-12-27

1979-01-02

McGraw, Vicent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

328166, G01J 342

Patent

active

041324811

ABSTRACT:
A cross-talk balancing circuit for double-beam spectrophotometers is disclosed. The circuit includes means to measure in four successive sample periods the sample plus sample re-radiation (S + s), reference radiation plus reference re-radiation (R + r), sample re-radiation (s) and reference re-radiation (r). The detector, however, does not respond quickly so it introduces cross-talk into each measurement. Electronic phasing circuitry selects the time when the detector output is sampled so that the cross-talk in the measurements is equalized permitting it to be subtracted out of the measurement thereby leaving a remainder which accurately corresponds to the desired quantities S and R.

REFERENCES:
patent: 3542480 (1970-11-01), Ford
patent: 3659942 (1972-05-01), Vergato
patent: 3967900 (1976-07-01), Henninger et al.
patent: 4030829 (1977-06-01), Hooper

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