Oxygen saturation detection aided with the theory of lock-in amplifier

Manjin Liu; Mei Hui; Ming Liu; Yuejin Zhao; Liquan Dong; Hong Wu; Xiaohua Liu; Zhu Zhao; Yun Feng; Di Chen; Lei Yang; Jingsheng Zhao

doi:10.1117/12.2059755

Oxygen saturation detection aided with the theory of lock-in amplifier

Manjin Liu, Mei Hui^*, Ming Liu, Yuejin Zhao, Liquan Dong, Hong Wu, Xiaohua Liu, Zhu Zhao, Yun Feng, Di Chen, Lei Yang, Jingsheng Zhao

^*Corresponding author for this work

School of Optics and Photonics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Citations (Scopus)

Abstract

This paper proposes a method to recover the pulse signal with the theory of lock-in amplifier and calculates the oxygen saturation. The pulse signal is obtained based on the method of Photoplethysmography (PPG). We use a LED as the light source and a photoelectric diode as the receiver to get a measured pulse wave. Because the pulse wave obtained by this method is easily disturbed by motion artifact, we use an electrocardiogram (ECG) signal to aid PPG measurement. Firstly, the ECG signal is processed by the Fast Fourier Transform (FFT) and get the heart rate. Secondly, with the value of heart rate, a typical noise free pulse waveform can be constructed. Finally, we use it as a reference input to get a recovered pulse wave by the theory of lock-in amplifier. Thus, the value of oxygen saturation can be calculated accurately through two recovered pulse waveforms of red (660nm) and infrared (940nm) light. Some volunteers were tested. The correlation coefficient between the experimental data and the data provided by a reference instrument is 0.98, proving that this method has high reliability and utility in motion.

Original language	English
Title of host publication	Optics and Photonics for Information Processing VIII
Editors	Abdul A. S. Awwal, Khan M. Iftekharuddin, Andres Marquez, Mohammad A. Matin
Publisher	SPIE
ISBN (Electronic)	9781628412437
DOIs	https://doi.org/10.1117/12.2059755
Publication status	Published - 2014
Event	8th Conference of Optics and Photonics for Information Processing - San Diego, United States Duration: 18 Aug 2014 → 20 Aug 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9216
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	8th Conference of Optics and Photonics for Information Processing
Country/Territory	United States
City	San Diego
Period	18/08/14 → 20/08/14

Keywords

Lock-in amplifier
Oxygen saturation
Photoplethysmography (PPG)

Access to Document

10.1117/12.2059755

Cite this

Liu, M., Hui, M., Liu, M., Zhao, Y., Dong, L., Wu, H., Liu, X., Zhao, Z., Feng, Y., Chen, D., Yang, L., & Zhao, J. (2014). Oxygen saturation detection aided with the theory of lock-in amplifier. In A. A. S. Awwal, K. M. Iftekharuddin, A. Marquez, & M. A. Matin (Eds.), Optics and Photonics for Information Processing VIII Article 921605 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9216). SPIE. https://doi.org/10.1117/12.2059755

@inproceedings{5c40380643aa4876b386764253f8c19f,

title = "Oxygen saturation detection aided with the theory of lock-in amplifier",

abstract = "This paper proposes a method to recover the pulse signal with the theory of lock-in amplifier and calculates the oxygen saturation. The pulse signal is obtained based on the method of Photoplethysmography (PPG). We use a LED as the light source and a photoelectric diode as the receiver to get a measured pulse wave. Because the pulse wave obtained by this method is easily disturbed by motion artifact, we use an electrocardiogram (ECG) signal to aid PPG measurement. Firstly, the ECG signal is processed by the Fast Fourier Transform (FFT) and get the heart rate. Secondly, with the value of heart rate, a typical noise free pulse waveform can be constructed. Finally, we use it as a reference input to get a recovered pulse wave by the theory of lock-in amplifier. Thus, the value of oxygen saturation can be calculated accurately through two recovered pulse waveforms of red (660nm) and infrared (940nm) light. Some volunteers were tested. The correlation coefficient between the experimental data and the data provided by a reference instrument is 0.98, proving that this method has high reliability and utility in motion.",

keywords = "Lock-in amplifier, Oxygen saturation, Photoplethysmography (PPG)",

author = "Manjin Liu and Mei Hui and Ming Liu and Yuejin Zhao and Liquan Dong and Hong Wu and Xiaohua Liu and Zhu Zhao and Yun Feng and Di Chen and Lei Yang and Jingsheng Zhao",

note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; 8th Conference of Optics and Photonics for Information Processing ; Conference date: 18-08-2014 Through 20-08-2014",

year = "2014",

doi = "10.1117/12.2059755",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

editor = "Awwal, {Abdul A. S.} and Iftekharuddin, {Khan M.} and Andres Marquez and Matin, {Mohammad A.}",

booktitle = "Optics and Photonics for Information Processing VIII",

address = "United States",

}

Liu, M, Hui, M, Liu, M, Zhao, Y, Dong, L, Wu, H, Liu, X, Zhao, Z, Feng, Y, Chen, D, Yang, L & Zhao, J 2014, Oxygen saturation detection aided with the theory of lock-in amplifier. in AAS Awwal, KM Iftekharuddin, A Marquez & MA Matin (eds), Optics and Photonics for Information Processing VIII., 921605, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9216, SPIE, 8th Conference of Optics and Photonics for Information Processing, San Diego, United States, 18/08/14. https://doi.org/10.1117/12.2059755

Oxygen saturation detection aided with the theory of lock-in amplifier. / Liu, Manjin; Hui, Mei; Liu, Ming et al.
Optics and Photonics for Information Processing VIII. ed. / Abdul A. S. Awwal; Khan M. Iftekharuddin; Andres Marquez; Mohammad A. Matin. SPIE, 2014. 921605 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9216).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Oxygen saturation detection aided with the theory of lock-in amplifier

AU - Liu, Manjin

AU - Hui, Mei

AU - Liu, Ming

AU - Zhao, Yuejin

AU - Dong, Liquan

AU - Wu, Hong

AU - Liu, Xiaohua

AU - Zhao, Zhu

AU - Feng, Yun

AU - Chen, Di

AU - Yang, Lei

AU - Zhao, Jingsheng

PY - 2014

Y1 - 2014

N2 - This paper proposes a method to recover the pulse signal with the theory of lock-in amplifier and calculates the oxygen saturation. The pulse signal is obtained based on the method of Photoplethysmography (PPG). We use a LED as the light source and a photoelectric diode as the receiver to get a measured pulse wave. Because the pulse wave obtained by this method is easily disturbed by motion artifact, we use an electrocardiogram (ECG) signal to aid PPG measurement. Firstly, the ECG signal is processed by the Fast Fourier Transform (FFT) and get the heart rate. Secondly, with the value of heart rate, a typical noise free pulse waveform can be constructed. Finally, we use it as a reference input to get a recovered pulse wave by the theory of lock-in amplifier. Thus, the value of oxygen saturation can be calculated accurately through two recovered pulse waveforms of red (660nm) and infrared (940nm) light. Some volunteers were tested. The correlation coefficient between the experimental data and the data provided by a reference instrument is 0.98, proving that this method has high reliability and utility in motion.

AB - This paper proposes a method to recover the pulse signal with the theory of lock-in amplifier and calculates the oxygen saturation. The pulse signal is obtained based on the method of Photoplethysmography (PPG). We use a LED as the light source and a photoelectric diode as the receiver to get a measured pulse wave. Because the pulse wave obtained by this method is easily disturbed by motion artifact, we use an electrocardiogram (ECG) signal to aid PPG measurement. Firstly, the ECG signal is processed by the Fast Fourier Transform (FFT) and get the heart rate. Secondly, with the value of heart rate, a typical noise free pulse waveform can be constructed. Finally, we use it as a reference input to get a recovered pulse wave by the theory of lock-in amplifier. Thus, the value of oxygen saturation can be calculated accurately through two recovered pulse waveforms of red (660nm) and infrared (940nm) light. Some volunteers were tested. The correlation coefficient between the experimental data and the data provided by a reference instrument is 0.98, proving that this method has high reliability and utility in motion.

KW - Lock-in amplifier

KW - Oxygen saturation

KW - Photoplethysmography (PPG)

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DO - 10.1117/12.2059755

M3 - Conference contribution

AN - SCOPUS:84922949453

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Optics and Photonics for Information Processing VIII

A2 - Awwal, Abdul A. S.

A2 - Iftekharuddin, Khan M.

A2 - Marquez, Andres

A2 - Matin, Mohammad A.

PB - SPIE

T2 - 8th Conference of Optics and Photonics for Information Processing

Y2 - 18 August 2014 through 20 August 2014

ER -

Oxygen saturation detection aided with the theory of lock-in amplifier

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Keywords

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