13 August 1993 Analysis of the photoplethysmographic signal
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Abstract
A photoplethysmography (PPG) device, which filters the dc signal without distorting the pulse shape, was developed. Measurements were performed on the finger, for hand at heart level, below and above it. The PPG signal was highest above heart level, and lowest below heart level. It seems that the compliance and the resistance of the blood vessels influence the PPG curve.
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Ehud Ratner, Meir Nitzan, Yoseph Shomer, Alexander Gutman, and Anatoly Babchenko "Analysis of the photoplethysmographic signal", Proc. SPIE 1972, 8th Meeting on Optical Engineering in Israel: Optoelectronics and Applications in Industry and Medicine, (13 August 1993); doi: 10.1117/12.151123; https://doi.org/10.1117/12.151123
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