Continuous-Spectrum Infrared Illuminator for Camera-PPG in Darkness

Wenjin Wang; L.P.J. Vosters; A.C. (Bert) den Brinker

doi:10.3390/s20113044

Continuous-Spectrum Infrared Illuminator for Camera-PPG in Darkness

Wenjin Wang (Corresponding author), L.P.J. Vosters, A.C. (Bert) den Brinker

Research output: Contribution to journal › Article › Academic › peer-review

2 Citations (Scopus)

Abstract

Many camera-based remote photoplethysmography (PPG) applications require sensing in near infrared (NIR). The performance of PPG systems benefits from multi-wavelength processing. The illumination source in such system is explored in this paper. We demonstrate that multiple narrow-band LEDs have inferior color homogeneity compared to broadband light sources. Therefore, we consider the broadband option based on phosphor material excited by LEDs. A first prototype was realized and its details are discussed. It was tested within a remote-PPG monitoring scenario in darkness and the full system demonstrates robust pulse-rate measurement. Given its accuracy in pulse rate extraction, the proposed illumination principle is considered a valuable asset for large-scale NIR-PPG applications as it enables multi-wavelength processing, lightweight set-ups with relatively low-power infrared light sources.

Original language	English
Article number	3044
Journal	Sensors
Volume	20
Issue number	11
DOIs	https://doi.org/10.3390/s20113044
Publication status	Published - 27 May 2020

Bibliographical note

This article belongs to the Special Issue Medical Applications of Sensor Systems and Devices)

Keywords

Biomedical sensing
Camera
Illumination
Near infrared
Photoplethysmography
Vital signs monitoring

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10.3390/s20113044

https://www.mdpi.com/1424-8220/20/11/3044/htm

Cite this

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title = "Continuous-Spectrum Infrared Illuminator for Camera-PPG in Darkness",

abstract = "Many camera-based remote photoplethysmography (PPG) applications require sensing in near infrared (NIR). The performance of PPG systems benefits from multi-wavelength processing. The illumination source in such system is explored in this paper. We demonstrate that multiple narrow-band LEDs have inferior color homogeneity compared to broadband light sources. Therefore, we consider the broadband option based on phosphor material excited by LEDs. A first prototype was realized and its details are discussed. It was tested within a remote-PPG monitoring scenario in darkness and the full system demonstrates robust pulse-rate measurement. Given its accuracy in pulse rate extraction, the proposed illumination principle is considered a valuable asset for large-scale NIR-PPG applications as it enables multi-wavelength processing, lightweight set-ups with relatively low-power infrared light sources.",

keywords = "Biomedical sensing, Camera, Illumination, Near infrared, Photoplethysmography, Vital signs monitoring",

author = "Wenjin Wang and L.P.J. Vosters and {den Brinker}, {A.C. (Bert)}",

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T1 - Continuous-Spectrum Infrared Illuminator for Camera-PPG in Darkness

AU - Wang, Wenjin

AU - Vosters, L.P.J.

AU - den Brinker, A.C. (Bert)

N1 - This article belongs to the Special Issue Medical Applications of Sensor Systems and Devices)

PY - 2020/5/27

Y1 - 2020/5/27

N2 - Many camera-based remote photoplethysmography (PPG) applications require sensing in near infrared (NIR). The performance of PPG systems benefits from multi-wavelength processing. The illumination source in such system is explored in this paper. We demonstrate that multiple narrow-band LEDs have inferior color homogeneity compared to broadband light sources. Therefore, we consider the broadband option based on phosphor material excited by LEDs. A first prototype was realized and its details are discussed. It was tested within a remote-PPG monitoring scenario in darkness and the full system demonstrates robust pulse-rate measurement. Given its accuracy in pulse rate extraction, the proposed illumination principle is considered a valuable asset for large-scale NIR-PPG applications as it enables multi-wavelength processing, lightweight set-ups with relatively low-power infrared light sources.

AB - Many camera-based remote photoplethysmography (PPG) applications require sensing in near infrared (NIR). The performance of PPG systems benefits from multi-wavelength processing. The illumination source in such system is explored in this paper. We demonstrate that multiple narrow-band LEDs have inferior color homogeneity compared to broadband light sources. Therefore, we consider the broadband option based on phosphor material excited by LEDs. A first prototype was realized and its details are discussed. It was tested within a remote-PPG monitoring scenario in darkness and the full system demonstrates robust pulse-rate measurement. Given its accuracy in pulse rate extraction, the proposed illumination principle is considered a valuable asset for large-scale NIR-PPG applications as it enables multi-wavelength processing, lightweight set-ups with relatively low-power infrared light sources.

KW - Biomedical sensing

KW - Camera

KW - Illumination

KW - Near infrared

KW - Photoplethysmography

KW - Vital signs monitoring

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U2 - 10.3390/s20113044

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SN - 1424-8220

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Continuous-Spectrum Infrared Illuminator for Camera-PPG in Darkness

Abstract

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Keywords

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