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Experimental Investigation of the Roles of Blood Volume and Density in Finger Photoplethysmography

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4 Author(s)
Adib Keikhosravi ; Electrical Engineering Department, Biomedical Engineering Group, Sharif University of Technology, Tehran, Iran ; Edmond Zahedi ; Hamid Movahedian Attar ; Haleh Aghajani

Using simultaneous photoplethysmogram (PPG) and pulse transducer signals from the same finger, a high correlation (Mean: 98.6, STD: 1) is obtained between the AC part of the PPG and estimated volume changes (after normalization). These results point to the fact that in the resting fingertip, PPG signal variations are only due to volume changes and that blood density does not change thus has no contribution.

Published in:

IEEE Sensors Journal  (Volume:13 ,  Issue: 5 )