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 |
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Article number | 3044 |
Journal | Sensors |
Volume | 20 |
Issue number | 11 |
DOIs | |
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