Using led harmonic wavelengths for near-infrared quantitative
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United States of America Patent
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Jun 8, 1993
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N/A
app pub date -
Nov 22, 1991
filing date -
Jan 19, 1989
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Abstract
A near-infrared quantitative analysis instrument for measuring a constituent of a sample material is disclosed which effectively utilizes energy in the 1200 to 1800 nanometer wavelengths regions by isolating and employing harmonic wavelengths emitted by typical, low cost commercially available light emitting diodes (LEDs) or infrared emitting diodes (IREDs). The analysis instrument utilizes these very desirable wavelength regions for quantitative analysis measurements by interposing suitable narrow bandpass filters which permit passage of only the selected harmonic wavelengths.
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