Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-04-19
1992-05-19
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356 41, 128633, 128664, G01N 3348
Patent
active
051151332
ABSTRACT:
An apparatus and method are disclosed for determining a level of a constituent such as glucose in a body fluid such as blood. The apparatus and method utilize a light generator for generating a testing light of known intensity with the testing light including a wavelength absorbable by the constituent being measured. The light generator also generates a reference light of known intensity having a wavelength not absorbable by the constituent being measured. The testing light and reference light are directed toward a fluid containing an unknown concentration of a constituent. A light detector is provided for measuring the intensity of the testing light and reference light being spectrally modified by the fluid. A light path distance measurer is provided for measuring a distance of a light path traveled by the testing light and reference light. A circuit is provided for calculating a level of the constituent in the fluid in response to a reduction in intensity of the testing light and reference light and in response to the measured distance.
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Beyer James E.
Fields Carolyn E.
Inomet, Inc.
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