Patent ID: 6754515
Filing Date: 2004-06-22
Classification: A61B

Abstract:
A photoplethysmographic measurement apparatus for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising:a plurality of emitters, wherein at least one of said emitters is a quiet light source and at least one of said emitters is a noisy light source; an output aperture through which the light signals from the emitters are incident upon the tissue-under-test; a detector that receives a portion of said light signals exiting the tissue-under-test and converts said received light signals to electronic signals indicative of the said received light signals, a processor that utilizes said electronic signals, originating from at least one of said quiet light sources, to minimize the effects of the noise generated by at least one of said noisy light sources on the accuracy or precision of the measurements of said blood analyte levels or said hemodynamic parameters.