Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1988-01-19
1989-11-21
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, 250345, 356 39, G01N 3350, G01N 2159, G01N 2147
Patent
active
048824925
ABSTRACT:
A non-invasive apparatus and related method for measuring the concentration of glucose or other blood analytes utilizes both diffuse reflected and transmissive infrared absorption measurements and may be applied to either in vitro or in vivo sampling. The apparatus and method utilize non-dispersive correlation spectrometry and apply it to liquid blood serum analysis. Spectrally-modified near infrared light from the sample containing the analyte is split into two beams, one of which is directed through a negative correlation filter which blocks light in the absorption bands for the analyte to be measured, and the other of which is directed through a neutral density filter capable of blocking light equally at all wavelengths in the range of interest. Differencing the light intensity between the two light paths provides a measure proportional to analyte concentration.
REFERENCES:
patent: 1758088 (1930-05-01), Schmick
patent: 2721942 (1955-10-01), Friel et al.
patent: 3926527 (1975-12-01), Pembrook et al.
patent: 4655225 (1987-04-01), Dahne et al.
Biotronics Associates, Inc.
Fields Carolyn E.
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