3 ms·
"The module uses light emitting diodes (LEDs) in conjunction with a light sensitive sensor to measure the absorption of red and infrared light by the user’s fin
by pella 9y ago
"The module uses light emitting diodes (LEDs) in conjunction with a light sensitive sensor to measure the absorption of red and infrared light by the user’s fingertips. "
see https://www.mediatek.com/features/sensio-biosensor-module https://www.mediatek.com/features/sensio-biosensor-module
- calvano915 9y agoA bit deeper, the PPG (photoplethysmogram) signal is measured by the user holding sensors on the phone with both hands. Using math I don't understand, the chip can then calculate a fairly accurate (within a couple mmHg) blood pressure. There are a couple papers describing the method on the first page of this search: https://encrypted.google.com/search?{google:acceptedSuggestion}oq=how+optical+blood+pressure+detection+works&q=how+optical+blood+pressure+detection+works https://encrypted.google.com/search?{google:acceptedSuggesti...
- carbocation 9y agoThanks - that's impressive agreement: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4986809/figure/g011/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4986809/figure/...