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

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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Wang, W., Vosters, L. P. J., & den Brinker, A. C. B. (2020). Continuous-Spectrum Infrared Illuminator for Camera-PPG in Darkness. Sensors, 20(11), [3044]. https://doi.org/10.3390/s20113044

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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.",

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