A method and means for generating synthetic spectra allowing quantitative measurement utilizes dual chip alternatively energized IREDs with optical bandpass filter(s) passing two optical bands which is be combined with curvilinear interpolation to be utilized in a low cost small size quantitative measuring...http://www.google.com.au/patents/US5324979?utm_source=gb-gplus-sharePatent US5324979 - Method and means for generating synthetic spectra allowing quantitative measurement in near infrared measuring instruments
