Abstract
Photo-plethysmography (PPG) is a non-contact non-invasive optical imaging technique which uses intensity and colour based information of transmitted or reflected light for bio-signal analysis. The major application areas are blood pulsation and blood oxygen saturation measurement. One of the major concerns of conventional PPG for blood pulsation measurement is its accuracy. Reflection based PPG contains a useful backscattered light component from the superficial and deep layer tissues of the skin and non-informative direct reflection from the skin surface. The direct reflection component reduces accuracy of blood pulsation measurement. This paper presents a technique, termed as Polarization Sensitive PPG (PSPPG), which removes the direct reflection component using polarizing filters. Experimental results show 30% improvement in the accuracy of blood pulsation measurement over conventional PPG. Further, statistical analysis of the measured results shows that the PSPPG is more accurate and reliable in comparison to conventional PPG for better bio-signal analysis.
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