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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials, Volume 33, Number 11(3) (2021)
Copyright(C) MYU K.K.
pp. 4017-4030
S&M2742 Research Paper of Special Issue
Published: November 30, 2021

Elimination of Motion Artifacts in Photoplethysmography Signals by Analytical Method [PDF]

Hualong Guo, Yang-Han Lee, Yi-Lun Chen, Shengrong Lu, and Hsien-Wei Tseng

(Received July 1, 2021; Accepted November 16, 2021)

Keywords: photoplethysmography (PPG), electrocardiography (ECG), independent component analysis, motion artifacts, multi-bandpass filter

Taiwan currently faces an aging population and a rise in mortality rate caused by cardiovascular disease. Therefore, the prevention of cardiovascular disease and the constant tracking of physiological information are crucial. Photoplethysmography (PPG) is used to instantaneously measure and monitor a person’s physiological information. Compared with electrocardiography, PPG measurements are more convenient and less expensive. However, PPG is more susceptible to the effects of motion artifacts. To accurately analyze the physiological information contained in PPG signals, the negative effects of motion artifacts on PPG signals must first be eliminated. In this study, independent component analysis was employed to separate independent components (i.e., PPG signals and noise) from raw signals with motion artifacts. Subsequently, independent components containing PPG signals were selected and the locations of the PPG signal components in the frequency spectrum were analyzed. Next, the raw signals were passed through a multi-bandpass filter specifically designed for this study to eliminate motion artifacts. Motion artifacts were created for an experiment using two types of finger movements: vertical and horizontal finger movements. From the independent component analysis of the independent components, the waveforms of the filtered PPG signals in the time and frequency domains were acquired, which were then compared with the results of heartbeat measurement.

Corresponding author: Hsien-Wei Tseng

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Cite this article
Hualong Guo, Yang-Han Lee, Yi-Lun Chen, Shengrong Lu, and Hsien-Wei Tseng, Elimination of Motion Artifacts in Photoplethysmography Signals by Analytical Method, Sens. Mater., Vol. 33, No. 11, 2021, p. 4017-4030.

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