Optics: measuring and testing – By shade or color – With sample responsive to plural colors applied simultaneously
Patent
1978-07-03
1980-03-18
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
With sample responsive to plural colors applied simultaneously
356411, 356414, 356419, 356425, G01N 2104, G01J 2102
Patent
active
041936949
ABSTRACT:
A color monitoring device is provided for measuring the concentration of a colored component in a flowing gas or liquid stream in which polychromatic light is passed through a frosted lens, then through a transparent sight tube through which the flowing stream passes, then through a second frosted lens, then through a sight mask which divides the light into two beams, one beam then passing through a first filter and the second beam passing through a second filter, the light beams passing through the filters then being directed to a first and second photoconductor, respectively. The first filter is one which absorbs light which is absorbed by the colored component to be measured and passes all other light. The second filter is one which passes light absorbed by the colored component and absorbs light of substantially all other wave lengths. The photoconductors are connected as resistance units in a null circuit such that, when the color component to be measured enters the flowing stream, the light intensity of the beam passing through the first filter is unchanged while the light intensity passing through the second filter is decreased due to the light absorbance by the colored component, this difference in intensity causing an imbalance in the null circuit which can be measured and used to monitor the concentration of the colored component.
REFERENCES:
patent: 3992110 (1976-11-01), Frazer et al.
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