Optics: measuring and testing – Photometers – Photoelectric
Patent
1982-07-23
1985-03-05
McGraw, Vincent P.
Optics: measuring and testing
Photometers
Photoelectric
356229, 356319, 356435, 377 53, G01J 118, G01N 2117
Patent
active
045027846
ABSTRACT:
An analyzer compensation circuit for compensating for the fluctuations in the intensity of the light source or for stains on the windows of cells in an analyzer. A pair of D-A converters are respectively connected to compensating and measuring light detectors. An up/down counter is arranged to count either up or down in response to the output of a comparator. The comparator compares the output of the D-A converter connected to the compensating detector with a reference value and the output of the up/down counter is connected to both of the D-A converters such that the output of the converter connected to the compensating detector is adjusted to be equal to the reference value. Since the other D-A converter is also connected to the output of the up/down counter, the output of the other D-A converter has been compensated for fluctuations in the light intensity or stains on the windows on cells used in the analyzer.
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Horiba Ltd.
McGraw Vincent P.
Turner S. A.
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