Relations between ac-dc components and optical path length in photoplethysmography

Chungkeun Lee; Hang Sik Shin; Myoungho Lee

doi:10.1117/1.3600769

1 July 2011 Relations between ac-dc components and optical path length in photoplethysmography

Chungkeun Lee, Hang Sik Shin, Myoungho Lee

Author Affiliations +

Journal of Biomedical Optics, Vol. 16, Issue 7, 077012 (July 2011). https://doi.org/10.1117/1.3600769

Abstract

Photoplethysmography is used in various areas such as vital sign measurement, vascular characteristics analysis, and autonomic nervous system assessment. Photoplethysmographic signals are composed of ac and dc, but it is difficult to find research about the interaction of photoplethysmographic components. This study suggested a model equation combining two Lambert-Beer equations at the onset and peak points of photoplethysmography to evaluate ac characteristics, and verified the model equation through simulation and experiment. In the suggested equation, ac was dependent on dc and optical path length. In the simulation, dc was inversely proportionate to ac sensitivity (slope), and ac and optical path length were proportionate. When dc increased from 10% to 90%, stabilized ac decreased from 1 to 0.89 ± 0.21, and when optical path length increased from 10% to 90%, stabilized ac increased from 1 to 1.53 ± 0.40.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Chungkeun Lee, Hang Sik Shin, and Myoungho Lee "Relations between ac-dc components and optical path length in photoplethysmography," Journal of Biomedical Optics 16(7), 077012 (1 July 2011). https://doi.org/10.1117/1.3600769

Published: 1 July 2011

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KEYWORDS

Photoplethysmography

Blood

Biomedical optics

Analytical research

Electrocardiography

Tissue optics

Absorption

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