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Sensors (Basel). 2018 Dec 31;19(1). pii: E118. doi: 10.3390/s19010118.

Oxygen Saturation Measurements from Green and Orange Illuminations of Multi-Wavelength Optoelectronic Patch Sensors.

Author information

1
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. S.M.Alharbi@lboro.ac.uk.
2
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. S.Hu@lboro.ac.uk.
3
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. D.J.Mulvaney@lboro.ac.uk.
4
School of Sport, Exercise and Health Sciences, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. L.A.Barrett@lboro.ac.uk.
5
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China. lw_yan@staff.shu.edu.cn.
6
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. P.Blanos@lboro.ac.uk.
7
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. Y.Elsahar@lboro.ac.uk.
8
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. S.T.Adema@lboro.ac.uk.

Abstract

Photoplethysmography (PPG) based pulse oximetry devices normally use red and infrared illuminations to obtain oxygen saturation (SpO₂) readings. In addition, the presence of motion artefacts severely restricts the utility of pulse oximetry physiological measurements. In the current study, a combination of green and orange illuminations from a multi-wavelength optoelectronic patch sensor (mOEPS) was investigated in order to improve robustness to subjects' movements in the extraction of SpO₂ measurement. The experimental protocol with 31 healthy subjects was divided into two sub-protocols, and was designed to determine SpO₂ measurement. The datasets for the first sub-protocol were collected from 15 subjects at rest, with the subjects free to move their hands. The datasets for the second sub-protocol with 16 subjects were collected during cycling and walking exercises. The results showed good agreement with SpO₂ measurements (r = 0.98) in both sub-protocols. The outcomes promise a robust and cost-effective approach of physiological monitoring with the prospect of providing health monitoring that does not restrict user physical movements.

KEYWORDS:

green and orange illuminations; optoelectronic patch sensor (mOEPS); oxygen saturation (SpO2); physical movement; pulse oximetry

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