Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Development of New Stacked Element Piezoelectric Polyvinylidene Fluoride Pressure Sensor for Simultaneous Heartbeat and Respiration Measurements

PVDF 압전소자를 이용한 심장박동 및 호흡수 동시측정센서개발

  • Park, Chang-Yong (Department of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Kweon, Hyun-Kyu (Department of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Lee, So-Jin (Department of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Manh, Long-Nguyen (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
  • 박창용 (금오공과대학교 기계시스템공학과) ;
  • 권현규 (금오공과대학교 기계시스템공학과) ;
  • 이소진 (금오공과대학교 기계시스템공학과) ;
  • 롱원만 (금오공과대학교 기계시스템공학과)
  • Received : 2019.03.05
  • Accepted : 2019.04.09
  • Published : 2019.04.30
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Abstract

In this paper, a new stacked element pressure sensor has proposed for heartbeat and respiration measurement. This device can be directly attached to an individual's chest; heartbeat and respiration are detected by the pulsatile vibration and deformation of the chest. A key feature of the device is the simultaneous measurement of heart rate and respiration. The structure of the sensor consists of two stacked elements, in which one element includes one polyvinylidene fluoride (PVDF) thin film bonded on polydimethylsiloxane (PDMS) substrate. In addition, for the measurement and signal processing, the electric circuit and the filter are simply constructed with an OP-amp, resistance, and a capacitor. One element (element1, PDMS) maximizes the respiration signal; the other (element2, PVDF) is used to measure heartbeat. Element1 and element2 had sensitivity of 0.163V/N and 0.209V/N, respectively, and element2 showed improved characteristics compared with element1 in response to force. Thus, element1 and element2 were optimized for measuring respiration heart rate, respectively. Through mechanical and vivo human tests, this sensor shows the great potential to optimize the signals of heartbeat and respiration compared with commercial devices. Moreover, the proposed sensor is flexible, light weight, and low cost. All of these characteristics illustrate an effective piezoelectric pressure sensor for heartbeat and respiration measurements.

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References

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