METHOD AND APPARATUS FOR MEASURING THE CONCENTRATION OF ABSORBING SUBSTANCES

A non-invasive system for measuring the concentration of an analyte in an absorbing matrix is described. The system di- rects a beam of radiation at the matrix. The beam consists of a series of successive alternate pulses of electro-magnetic radiation, one of which is highly absorbed by the analyte...

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Bibliographische Detailangaben
Hauptverfasser:	PEURA, ROBERT A, HARJUNMAA, HANNU, MENDELSON, YITZHAK
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	DIAGNOSIS HUMAN NECESSITIES HYGIENE IDENTIFICATION INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEDICAL OR VETERINARY SCIENCE PHYSICS SURGERY TESTING
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Beschreibung
Zusammenfassung:	A non-invasive system for measuring the concentration of an analyte in an absorbing matrix is described. The system di- rects a beam of radiation at the matrix. The beam consists of a series of successive alternate pulses of electro-magnetic radiation, one of which is highly absorbed by the analyte and the other of which is non - absorbed. The transmitted or reflected beam is opti- cally detected and an electrical signal proportional to beam intensity is us ed to adjust the beam intensity and as a measure of ana- lyte concentration.