Low cost means for increasing measurement sensitivity in LED/IRED near-infrared instruments
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United States of America Patent
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Nov 15, 1994
Issued Date -
N/A
app pub date -
Nov 23, 1992
filing date -
Jan 19, 1989
priority date (Note) -
Expired
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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.
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