Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1981-10-19
1984-11-13
Evans, F. L.
Optics: measuring and testing
By shade or color
With color transmitting filter
356414, 364498, G01J 350
Patent
active
044822510
ABSTRACT:
A clinical analyzer that is microprocessor controlled is disclosed. A shuttle carries a plurality of cuvettes containing liquids to be spectrophotometrically analyzed by a single beam spectrophotometer. The shuttle moves the cuvettes past the spectrophotometer in a plurality of cycles to complete a given test. At the beginning of a test, spectrophotometer lamp energization is controlled to achieve a predetermined spectrophotometer output for a reference filter. The remaining filters are then positioned one-by-one, and amplifier gain is adjusted to achieve optimum spectrophotometer output for each filter. The gain associated with each filter is stored by the microprocessor, and thereafter during the test, when each filter is used, the stored gain associated with that microprocessor is utilized in the amplifier circuitry. Additionally, at the beginning of each cycle of shuttle movement, an air calibration reading is taken, to be used by the microprocessor in determining absorbance. This air-only reading, in combination with a reference reading taken with a water-filled cuvette at any convenient time, serves to provide for accurate calibration of the system, overcoming problems of drift.
REFERENCES:
patent: Re28803 (1976-05-01), Durkos et al.
patent: 3580683 (1971-05-01), Schulkind
patent: 3703336 (1972-11-01), Rosse et al.
patent: 3783300 (1974-01-01), Johnson
patent: 3960497 (1976-06-01), Acord
patent: 4053235 (1977-10-01), Hampton et al.
Electro-Nucleonics, Inc.
Evans F. L.
Scobey Robert
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