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Wearable Photoplethysmographic Sensors—Past and Present
2014
Electronics
Photoplethysmography (PPG) technology has been used to develop small, wearable, pulse rate sensors. These devices, consisting of infrared light-emitting diodes (LEDs) and photodetectors, offer a simple, reliable, low-cost means of monitoring the pulse rate noninvasively. Recent advances in optical technology have facilitated the use of high-intensity green LEDs for PPG, increasing the adoption of this measurement technique. In this review, we briefly present the history of PPG and recent
doi:10.3390/electronics3020282
fatcat:76fbytrdqbgafdesgtfcbqk3de