Optical determination of blood perfusion and similar parameters
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United States of America Patent
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Jan 24, 2017
Grant Date -
Feb 28, 2013
app pub date -
Feb 26, 2010
filing date -
Feb 26, 2010
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Abstract
A parameter affecting the absorptivity or the concentration of blood in tissue is measured using a semiconductor light source (7) and a light detector (8). The semiconductor light source (7) is operated at several operating conditions, at which it has different temperatures and therefore different emission spectra. In particular, the operating conditions correspond to different time intervals after switching the light source (7) on, while the light source (7) has not yet reached thermal equilibrium. This allows to perform a spectroscopic measurement using one light source only, which increases accuracy and reduces device cost.
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