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...http://www.google.fr/patents/US5218207?utm_source=gb-gplus-shareBrevet US5218207 - Using led harmonic wavelengths for near-infrared quantitative
Using led harmonic wavelengths for near-infrared quantitative
