Calibration system for spectrophotometers

Details Calibration system for spectrophotometers Calibration system for spectrophotometers

1978-08-22

1980-09-23

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

With color transmitting filter

356320, 356243, G01J 348, G01J 342

Patent

active

042239958

ABSTRACT:
A calibration system is provided for spectrophotometers of the type in which two or more wave lengths of light are caused to be transmitted through a sample cell. The calibration system may be used to calibrate spectrophotometers in which the beams are sequentially transmitted through the sample. In the practice of the invention, the sample is replaced with a number of accurately known optical attenuators which are introduced into the system in synchronism with the two light beams. The system provides calibration for both the scaling and linearization of the spectrophotometer, or conversely provides for the generation of tables and graphs which permit the operator to correct the photometer reading into an accurate representation.

REFERENCES:
patent: 3762817 (1973-10-01), Harklau
patent: 3844661 (1974-10-01), Birkett et al.

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