Wearable Photoplethysmographic Sensors—Past and Present

@article{Tamura2014WearablePS,
  title={Wearable Photoplethysmographic Sensors—Past and Present},
  author={Toshiyo Tamura and Yuka Maeda and Masaki Sekine and Masaki Yoshida},
  journal={Electronics},
  year={2014},
  volume={3},
  pages={282-302}
}
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… 

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