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Tech Talk: How can a smartwatch or smart ring detect your blood oxygen levels?
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(Image credit: Michael Hicks / Android Central)I'll use SpO2 reading as an example to illustrate how this can work, but methods such as heart rate detection and glucose monitoring can also be implemented using the same principles. You've probably seen them blinking green, but the two used for SpO2 measurement are red and infrared(light you can't see that penetrates solids like your skin differently). (Image credit: Michael Hicks / Android Central)LEDs and photodiodes are also used for heart rhythm, heartbeat, glucose monitoring, and most anything that involves measuring your blood without actually sampling it.
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