Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-11-23
1994-11-15
Dzierzynski, Paul M.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25033901, 356 39, 128633, G01N 2135
Patent
active
053650662
ABSTRACT:
A low cost means for increasing measurement sensitivity in LED near-infrared instruments is disclosed which utilizes a current modification means for modifying the driving current supplied to each IRED as a function of the opacity of the particular sample being measured. The current modification means is part of the processing means and comprises means for measuring a signal level for each IRED at an analog-to-digital converter. Based upon the signal level detected for each IRED, the current modification means modifies the current to each IRED to a value that is as high as possible without saturating the analog-to-digital converter. Thus, by modifying the driving current of each IRED to such a maximal value, the analytical instrument of the present invention provides high resolution without the use of expensive electronic circuitry. Also provided is a system for generating and storing an optical signature of a particular user, thus further insuring the accuracy of measurements taken by the instrument.
REFERENCES:
patent: 5077476 (1991-12-01), Rosenthal
patent: 5204532 (1993-04-01), Rosenthal
Krueger, Jr. Don E.
Rosenthal Robert D.
Dzierzynski Paul M.
Futrex Inc.
Hanig Richard
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