Abstract
Photoplethysmography (PPG) is an early technique based on the relative transparency of the human skin for red or near-infrared light (700-1000 nm), and on the diffusing effect of red blood cells (RBCs) which reduces these wavelengths retrodiffusion. The variation in the quantity of RBCs within the skin induces an inverse variations of the retrodiffused light detected on the surface (about 1 % of incident light). Therefore, PPG provides a measurement of any type (active or passive) blood volume variation at the tested site.
This chapter was originally published under the ISBN 978-3-540-01771-4 with the following book title Measuring the Skin. The content has not been changed.
Pierre Agache: deceased
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Agache, P. (2017). Photoplethysmography in the Evaluation of Skin Conditions. In: Humbert, P., Fanian, F., Maibach, H., Agache, P. (eds) Agache's Measuring the Skin. Springer, Cham. https://doi.org/10.1007/978-3-319-32383-1_56
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DOI: https://doi.org/10.1007/978-3-319-32383-1_56
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