SOFT SENSORS FOR MONITORING RESPIRATORY AND HEART SOUND

Authors :: Cheng Long-Cheng
Shi-Ing Huang
Chun Yu
Tzu-Hsiu Tsai
Chii-Wann Lin
Chou Show-Hwai
Source :: Biomedical Engineering: Applications, Basis and Communications. 21:453-456
Publication Year :: 2009
Publisher :: National Taiwan University, 2009.
Abstract: The soft sensors for monitoring respiratory and heart sound were composed of polyurethane and microphones. In this study, silica was blended with polyurethane to change the hardness of the chambers. The hardness would influence the frequency response of the sensors. The material composed of 60 phr silica was chosen to make the chamber of the sensor. It had higher hardness and resulted in the flatten frequency response across the range of 100–1200 Hz. By the filter band designed for heart sound and respiratory sound signal, the heart sound and respiratory sound can be collected. The measured sound was verified by the physician and showed no distortion.