3 ms·
If they used a red/IR LED pair instead of a single green LED they could sense oxygen concentration as well as heart rate. The absorption spectrum for oxygen-enr
by yellowbkpk 15y ago
If they used a red/IR LED pair instead of a single green LED they could sense oxygen concentration as well as heart rate. The absorption spectrum for oxygen-enriched blood is different in the two wavelengths. Toggle between the two LEDs fast enough and you'll only need a single light sensor, too.
- Futurologist 15y agoYes, blood oxy is easily derived that way, but we were not interested in making a device that had that level of medical accuracy and application. (maybe in future version...?) We just wanted a simple heartbeat sensor with simple interface for hackers. That said, you can get relative blood oxy concentration. A couple of deep breaths will shift the waveform up ~20 points on our visualizer, for example.(I'm a co-creator of Pulse Sensor)