An Experimental Study of PPG Probe Efficiency Coefficient Determination on Human Body

Some of the cardio vascular disease diagnostics need the long-term photoplethysmography (PPG) signal measurement session. For such kind of measurements, PPG probes have to be designed. In addition, the PPG signal shape, as diagnostic information carrier, is also dependent on probe location on human body. To make the PPG probe comparison, experiments were conducted, using PPG probes with different geometrical, optical and electrical parameters on different places of human body, where the signal under interest is measurable. The aim of the study is to design efficient PPG probe for each selected location on human body. As result for each probe, the efficiency-describing coefficient was calculated, which is the ratio of PPG AC component and diode current.