Two beam alternating light colorimeter

Details Two beam alternating light colorimeter Two beam alternating light colorimeter

1979-12-31

1981-08-11

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

356325, 356408, 356434, G01J 308, G01J 342, G01N 2127

Patent

active

042831423

ABSTRACT:
A two beam alternating light colorimeter is disclosed wherein a light beam passing through a lens system having a shutter is periodically deflected by a pivoting mirror. In a first non-deflecting position of the pivotable mirror a first measuring beam is created which passes through a first measuring cell and is guided to a common photo cell. In a second deflecting position of the mirror a second measuring beam is created which is guided through a second measuring cell to the same photo cell. Signals from the photo cell are connected through a controlled switching element to an analog memory. A computing circuit is provided which connects to an output of the analog memory and also to the photo cell. The switching element connects the first measuring signal to the analog memory when the mirror is in a non-deflecting position and opens when the mirror is in a deflecting position. The computing circuit compares the signals corresponding to the first and second measuring beams.

REFERENCES:
patent: 4063817 (1977-12-01), Shimamura et al.
patent: 4092069 (1978-05-01), Fukuda et al.

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