HIGH RESOLUTION HADAMARD TRANSFORM OXIMETRY

D. Barschdorff, E. Starke

Abstract

The principle of pulse oximetry is based on the different absorption of haemoglobin at various wavelengths in the visible and IR-region, utilizing Lambert- Beers law. With conventional oximeters a part of the human body is penetrated by radiation at two wavelengths and the oxygen saturation is calculated from the detected signals. Intention of the optical set-up presented here is the improvement of the signal-to-noise-ratio of the detected signals by a modified signal generation. Radiation of three different sources penetrates the human skin in a time-multiplex sequence, which is designated by a Hadamard matrix. The signals of the distinct radiation sources are obtained mathematically from the detected sum signals. The optical set-up exemplifies the principle, which can be transferred to other blood ingredients than haemoglobin when the emitting wavelengths of the radiation sources are changed.

Keywords

NIR-Spectroscopy, pulse oximetry, hadamard transformation

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IMEKO-WC-2000-TC13-P329.pdf

DOI

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IMEKO TC

TC13 - Measurements in Biology and Medicine

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