Using led harmonic wavelengths for near-infrared quantitative

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive

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250339, 250343, 128633, 356 39, G01N 3350

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active

052182070

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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Mueller et al., "Glucose Determination--State of the Art and Prospects," Biomedizinische Technik 25, 26-32 (1980); German language and translation.

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