Introduction to PPG

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Introduction to PPG

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This document introduces the required concepts of photoplethysmography (PPG) and differences relating to PPG signals at different body locations. Suggestions are provided for the integration of the Stromboli PPG module into different wearable devices. PPG technology relies on the propagation of light into the skin. When the light diffuses into the tissue, a portion is absorbed at a level that fluctuates with the dilatation of the arterial vessels, induced by the heart beats. A photodetector or sensor detects the light reflected from the tissue and transforms it into a photogenerated current.

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