A non-invasive blood glucose meter includes a near-infrared energy analyzer which includes a light filter assembly of two Fabry-Perot interferometers and a photosensor. The near-infrared energy analyzer detects near-infrared energy absorbed by a human or animal body and generates spectra of such absorption...http://www.google.de/patents/US6043492?utm_source=gb-gplus-sharePatent US6043492 - Non-invasive blood glucose meter
