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 journalArticleAcademicpeer-review

3 Citations (Scopus)


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 languageEnglish
Article number3044
Issue number11
Publication statusPublished - 27 May 2020

Bibliographical note

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


  • Biomedical sensing
  • Camera
  • Illumination
  • Near infrared
  • Photoplethysmography
  • Vital signs monitoring


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