Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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The Verification of Photoplethysmography Using Green Light that Influenced by Ambient Light

녹색광을 이용한 반사형 광용적맥파측정기의 주변광 간섭시 신호측정

  • Chang, K.Y. (Department of Biomedical Engineering, Graduate School of Yonsei University) ;
  • Ko, H.C. (Department of Biomedical Engineering, Graduate School of Yonsei University) ;
  • Lee, J.J. (Department of Biomedical Engineering, Graduate School of Yonsei University) ;
  • Yoon, Young Ro (Department of Biomedical Engineering, Graduate School of Yonsei University)
  • 장기영 (연세대학교 대학원 의공학부) ;
  • 고현철 (연세대학교 대학원 의공학부) ;
  • 이정직 (연세대학교 대학원 의공학부) ;
  • 윤영로 (연세대학교 대학원 의공학부)
  • Received : 2014.07.09
  • Accepted : 2014.10.07
  • Published : 2014.10.31
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Abstract

The purpose of this study is to verify the utility of reflected photoplethysmography sensor using two green light emitting diodes that influenced by ambient light. Recently it has been studied that green light emitting diode is suitable for light source of reflected photoplethysmography sensor at low temperature and high temperature. Another study showed that, green light is better for monitoring heart rate during motion than led light. However, it has a bad characteristic about ambient light noise. To verify the utility of reflected photoplethysmography sensor using green light emitting diode, this study measures the photoplethysmography signal that is distorted by ambient light and will propose a solution. This study has two parts of research method. One is measurement system that composed sensor and board. The sensor is made up PE-foam and Non-woven fabric for flexible sensor. The photoplethysmography signal is measured by measurement board that composed high-pass filter, low-pass filter and amplifier. Ambient light source is light bulb and white light emitting diode that has three steps brightness. Photoplethysmography signal is measured with lead II electrocardiography signal at the same time and it is measured at the finger and radial artery for 1 minute, 1000 Hz sampling rate. The lead II electrocardiography signal is a standard signal for heart rate and photoplethysmography signal that measured at the finger is a standard signal for waveform. The test is repeated 3 times using three sensor. The data is processed by MATLAB to verify the utility by comparing the correlation coefficient score and heart rate. The photoplethysmography sensor using two green light emitting diodes is shown better utility than using one green light emitting diode and red light emitting diode at the ambient light. The waveform and heart rate that measured by two green light emitting diodes are more identical than others. The amount of electricity used is less than red light emitting diode and error peak detectability factor is the lowest.

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References

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