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Proceedings Paper

Numerical and experimental study of the influence of device pressure on PPG signal acquisition
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Paper Abstract

The accuracy of non-invasive detection devices using photoplethysmography signal (PPG) for blood content often fails to meet the medical clinical standards. The reason for the error is partly due to theoretical algorithms, and partly due to the design of hardware. PPG signal acquisition device puts pressure on the skin during measurement, which affects the PPG signal. Aiming at this problem, this paper uses the finite element method to construct a skin model under pressure, and the optical transmission simulation experiment are used to analyze the changing trend of the reflected light intensity under different pressures. It was found that the change of reflected light intensity with pressure is related to the detection distance and wavelength. Simultaneously, the PPG sensor in our laboratory are used to carry out pressure experiments. The measured results verify simulation results. The influence of pressure on the DC, AC component and quality of PPG signals are analyzed ulteriorly. And we found the optimal pressure range is 0.4N~1.2N for 7 subjects.

Paper Details

Date Published: 20 February 2020
PDF: 12 pages
Proc. SPIE 11238, Optical Interactions with Tissue and Cells XXXI, 1123812 (20 February 2020); doi: 10.1117/12.2542794
Show Author Affiliations
Qun Wang, Beijing Institute of Technology (China)
Di Sheng, Beijing Institute of Technology (China)
Zhiguo Zhou, Beijing Institute of Technology (China)
Zhiwen Liu D.D.S., Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 11238:
Optical Interactions with Tissue and Cells XXXI
Bennett L. Ibey; Norbert Linz, Editor(s)

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