Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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A compact and low-power consumable device for continuous monitoring of biosignal

소형화 및 저전력소모를 구현한 실시간 생체신호 측정기 개발

  • Cho, Jung-Hyun (Institute for Biomedical Electronics, Electronic & Information Engineering, Seoul National University of Technology) ;
  • Yoon, Gil-Won (Institute for Biomedical Electronics, Electronic & Information Engineering, Seoul National University of Technology)
  • 조정현 (서울산업대학교 전자정보공학과 의료전자연구소) ;
  • 윤길원 (서울산업대학교 전자정보공학과 의료전자연구소)
  • Published : 2006.09.30
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Abstract

A compact biosignal monitoring device was developed. Electrodes for electrocardiogram (ECG) and a LED and silicon detector for photoplethysmogram (PPG) were used. A lead II type was arranged for ECG measurement and reflected light was measured at the finger tip for PPG. A single chip microprocessor (model ADuC812, Analog Device) controlled a measurement protocol and processed measured signals. PPG and ECG had a sampling rate of 300 Hz with 8-bit resolution. The maximum power consumption was 100 mW. The microprocessor computed pulse transit time (PTT) between the R-wave of ECG and the peak of PPG. To increase the resolution of PTT, analog peak detectors obtained the peaks of ECG and PPG whose interval was calculated using an internal clock cycle of 921.6 kHz. The device was designed to be operated by 3-volt battery. Biosignals can be measured for $2{\sim}3$ days continuously without the external interruptions and data is stored to an on-board memory. Our system was successfully tested with human subjects.

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References

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