Two beam alternating light colorimeter

Details Two beam alternating light colorimeter Two beam alternating light colorimeter

G - Physics

01

J

73/57

G01J 3/42 (2006.01) G01J 1/36 (2006.01)

Patent

CA 1134168

ABSTRACT OF THE DISCLOSURE A two beam alternating light colorimeter is dis- closed 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 deflect- ing 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 'he mirror is in a deflecting position. The computing circuit compares the signals corresponding to the first and second measuring beams.

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