Real-Time Heart Rate Monitoring System based on Ring-Type Pulse Oximeter Sensor

Park, Seung-Min;Kim, Jun-Yeup;Ko, Kwang-Eun;Jang, In-Hun;Sim, Kwee-Bo

  • Received : 2011.09.20
  • Accepted : 2012.11.01
  • Published : 2013.03.01


With the continuous aging of the populations in developed countries, the medical requirements of the aged are expected to increase. In this paper, a ring-type pulse oximeter finger sensor and a 24-hour ambulatory heart rate monitoring system for the aged are presented. We also demonstrate the feasibility of extracting accurate heart rate variability measurements from photoelectric plethysmography signals gathered using a ring-type pulse oximeter sensor attached to the finger. We designed the heart rate sensor using a CPU with built-in ZigBee stack for simplicity and low power consumption. We also analyzed the various distorted signals caused by motion artifacts using a FFT, and designed an algorithm using a least squares estimator to calibrate the signals for better accuracy.


Heart rate sensor;Photoelectric plethysmography;Heart rate variability;Blood volume pulse;Biomedical monitoring;U-health care


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Supported by : Chung-Ang University