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Medical & Biological Engineering & Computing

, Volume 45, Issue 11, pp 1113–1119 | Cite as

A study on a non-contacting respiration signal monitoring system using Doppler ultrasound

  • Se Dong Min
  • Dae Joong Yoon
  • Sung Won Yoon
  • Yong Hyeon Yun
  • Myoungho LeeEmail author
Special Issue

Abstract

We proposed non-contacting respiration signal monitoring system for sleep apnea syndrome. Experiments were conducted by emitting 40 kHz ultrasound beam, which is set tone burst mode by 1 ms period to a subject chest. Normal respiration condition and a simulated sleep apnea syndrome condition were measured while subjects were holding breath. To obtain the actual respiration signal from the raw signal, ultrasound attenuation characteristics were considered. The Doppler ultrasound signal was detectable once the received signal obtained by demodulation circuits passed through a low pass filter (LPF). The signal’s ripples were eliminated by moving average method and the signal’s peaks were detected by phase portrait reconstruction method to measure the respiration rate.

Keywords

Non-contacting Respiration signal monitoring Sleep apnea Ultrasound attenuation characteristic Phase portrait reconstruction method 

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Copyright information

© International Federation for Medical and Biological Engineering 2007

Authors and Affiliations

  • Se Dong Min
    • 1
  • Dae Joong Yoon
    • 1
  • Sung Won Yoon
    • 1
  • Yong Hyeon Yun
    • 1
  • Myoungho Lee
    • 1
    Email author
  1. 1.Department of Electrical and Electronic EngineeringYonsei UniversitySeoulSouth Korea

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