Method and device for analysis with color identification test pa

Details Method and device for analysis with color identification test pa Method and device for analysis with color identification test pa

1979-01-23

1983-02-15

Arnold, Bruce Y.

Optics: measuring and testing

By shade or color

With sequential comparison of sample and standard

356445, G01N 2127

Patent

active

043738184

ABSTRACT:
A method and apparatus are disclosed for an analyzer which measures concentration of a liquid specimen by monitoring the coloration of test paper which is either dipped into the specimen or is otherwise painted with it. In the method, inner stray rays produced by a light source which do not reach the test paper are experimentally monitored, so that the effect of such inner stray rays upon the accuracy of the test paper analysis is eliminated. Additionally, a method of relating relative reflectivity of the test paper to the concentration of the specimen is disclosed, in which method the calibration curve is modeled as a section of a hyperbola. In the apparatus, a microcomputer performs the evaluation and the detection of the coloration of the test paper and the compensation for various sources of instrumental error takes place electronically.

REFERENCES:
patent: 2451501 (1948-10-01), Liben
patent: 3874799 (1975-04-01), Isaacs et al.
patent: 4171918 (1979-10-01), Mactaggart

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