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Volume 19
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10.3390/s19173698
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Article

MW-PPG Sensor: An on-Chip Spectrometer Approach

by
Cheng-Chun Chang
1,*,
Chien-Ta Wu
1,
Byung Il Choi
2 and
Tong-Jing Fang
3
1
Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
2
nanoLambda Co. Ltd., Daejeon 34141, Korea
3
Department of Physiology and Biophysics, Graduate Institute of Physiology National Defense Medical Center, Taipei 11490, Taiwan
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(17), 3698; https://doi.org/10.3390/s19173698
Submission received: 26 July 2019 / Revised: 21 August 2019 / Accepted: 22 August 2019 / Published: 26 August 2019
(This article belongs to the Section Biomedical Sensors)
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Abstract

Multi-wavelength photoplethysmography (MW-PPG) sensing technology has been known to be superior to signal-wavelength photoplethysmography (SW-PPG) sensing technology. However, limited by the availability of sensing detectors, many prior studies can only use conventional bulky and pricy spectrometers as the detectors, and hence cannot bring the MW-PPG technology to daily-life applications. In this study we developed a chip-scale MW-PPG sensor using innovative on-chip spectrometers, aimed at wearable applications. Also in this paper we present signal processing methods for robustly extracting the PPG signals, in which an increase of up to 50% in the signal-to-noise ratio (S/N) was observed. Example measurements of saturation of peripheral blood oxygen (SpO2) and blood pressure were conducted.
Keywords: multi-wavelengths; MW-PPG; on-chip spectrometers multi-wavelengths; MW-PPG; on-chip spectrometers

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MDPI and ACS Style

Chang, C.-C.; Wu, C.-T.; Choi, B.I.; Fang, T.-J. MW-PPG Sensor: An on-Chip Spectrometer Approach. Sensors 2019, 19, 3698. https://doi.org/10.3390/s19173698

AMA Style

Chang C-C, Wu C-T, Choi BI, Fang T-J. MW-PPG Sensor: An on-Chip Spectrometer Approach. Sensors. 2019; 19(17):3698. https://doi.org/10.3390/s19173698

Chicago/Turabian Style

Chang, Cheng-Chun, Chien-Ta Wu, Byung Il Choi, and Tong-Jing Fang. 2019. "MW-PPG Sensor: An on-Chip Spectrometer Approach" Sensors 19, no. 17: 3698. https://doi.org/10.3390/s19173698

APA Style

Chang, C.-C., Wu, C.-T., Choi, B. I., & Fang, T.-J. (2019). MW-PPG Sensor: An on-Chip Spectrometer Approach. Sensors, 19(17), 3698. https://doi.org/10.3390/s19173698

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