Optics: measuring and testing – Blood analysis – Hemoglobin concentration
Patent
1980-06-30
1982-09-21
McGraw, Vincent P.
Optics: measuring and testing
Blood analysis
Hemoglobin concentration
324140D, 328161, 250565, 356320, 356408, 356434, G01N 3348, G01N 2131
Patent
active
043504418
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.
REFERENCES:
patent: 2358992 (1944-09-01), Millikan
patent: 2640389 (1953-06-01), Liston
patent: 2722156 (1955-11-01), Warren
patent: 3522739 (1970-08-01), Coor et al.
patent: 3647299 (1972-03-01), Lavallee
patent: 3684378 (1972-08-01), Lord
patent: 3720813 (1973-03-01), Badessa
patent: 3730627 (1973-05-01), Kent
patent: 3734631 (1973-05-01), Justice et al.
patent: 3787124 (1974-01-01), Lowy et al.
patent: 3799672 (1974-03-01), Vurek
patent: 3804535 (1974-04-01), Rodriguez
patent: 3952206 (1976-04-01), Liedholz
patent: 4136818 (1979-01-01), Larrabee
patent: 4305659 (1981-12-01), Bilstad et al.
Baxter Travenol Laboratories Inc.
Flattery Paul C.
Gerstman George H.
McGraw Vincent P.
Ryan Daniel D.
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