Photometric apparatus and method
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United States of America Patent
Stats
-
Sep 21, 1982
Grant Date -
N/A
app pub date -
Jun 30, 1980
filing date -
Jun 30, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A photometric system for determining the absorbance ratio, in a sample, of two different wavelength lights. First and second lights, each having a different wavelength, are passed through the sample in alternation with each other. The radiation intensity from each light that has passed through the sample is detected. A comparator, up/down counter and digital to analog converter are coupled so that a scaling factor is derived which, when multiplied with an analog signal proportional to the intensity of the first light after it has passed through the sample, is equal to an analog signal proportional to the intensity of the second light after it has passed through the sample. The output of the counter comprises a digital word corresponding to the ratio of the absorbance ratio of the first light and the second light.
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