Evaluation of the impact of LED viewing angle and optical window choice on photoplethysmography signal quality

Angel Solé Morillo; Joan Lambert Cause; Dib Rizk; Bruno Da Silva; Johan Stiens

doi:10.1117/12.3001707

12 March 2024 Evaluation of the impact of LED viewing angle and optical window choice on photoplethysmography signal quality

Angel Solé Morillo, Joan Lambert Cause, Dib Rizk, Bruno Da Silva, Johan Stiens

Author Affiliations +

Proceedings Volume 12835, Optical Fibers and Sensors for Medical Diagnostics, Treatment, and Environmental Applications XXIV; 128350Q (2024) https://doi.org/10.1117/12.3001707
Event: SPIE BiOS, 2024, San Francisco, California, United States

Abstract

Photoplethysmography (PPG) is a non-invasive optical technique used to extract physiological information by means of light interaction with the skin. PPG is widely used in pulse oximeters, and the evolution of wearable technologies is further enlarging its applications. A great variety of influencing factors impact the PPG waveform, making the correct feature extraction difficult and, therefore, limiting the accuracy of many PPG applications. The device hardware and software are among these influencing factors. This study evaluates the impact on the PPG signal quality of the LED viewing angle (luminous aperture) and the protective glass material, thickness, and anti-reflective coating, both important building blocks of a PPG sensor. Results suggest that the larger the viewing angle, the smaller the detected signal amplitude. The protective glass properties on the contrary does not seem to impact the detected signal amplitudes.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Angel Solé Morillo, Joan Lambert Cause, Dib Rizk, Bruno Da Silva, and Johan Stiens "Evaluation of the impact of LED viewing angle and optical window choice on photoplethysmography signal quality", Proc. SPIE 12835, Optical Fibers and Sensors for Medical Diagnostics, Treatment, and Environmental Applications XXIV, 128350Q (12 March 2024); https://doi.org/10.1117/12.3001707

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