Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1986-01-02
1989-01-10
Rosenberger, Richard A.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356435, 356409, C01N 2153
Patent
active
047970006
ABSTRACT:
A comparitive colorimeter for use in the field which simultaneously compares the color densities of two liquid samples and designates the degree of difference. The apparatus includes two major subsystems, optical and electronic. The optical subsystem is designed to provide identical light beams through both the sample and standard solutions and to minimize the effect which imperfect sample tubes have on the output. The electronic subsystem includes a log conversion and differential amplifier circuit for generating a difference signal representative of the difference between the optical densities of the sample and standard solutions. The difference signal is evaluated by a comparative circuit consisting of a resistive chain having a plurality of node voltages and hex inverters connected to the node voltages. The hex inverters drive a series of LED indicator lights to designate the relative degree of difference between the optical densities of the sample and standard. A correction circuit is provided for referencing the difference signal to the threshold voltage of the hex inverters and for compensating for initial differences in the optical paths of the sample and standard solutions.
REFERENCES:
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patent: 2617940 (1952-11-01), Giguere
patent: 2873644 (1959-02-01), Kremen et al.
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patent: 4006990 (1977-02-01), Munk
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patent: 4310249 (1982-01-01), Kramer
Artel
Rosenberger Richard A.
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