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Conf Proc IEEE Eng Med Biol Soc · Jan 2012
Comparative StudyAn ultra-sensitive wearable accelerometer for continuous heart and lung sound monitoring.
- Yating Hu and Yong Xu.
- Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA. eb2256@wayne.edu
- Conf Proc IEEE Eng Med Biol Soc. 2012 Jan 1;2012:694-7.
AbstractThis paper presents a chest-worn accelerometer with high sensitivity for continuous cardio-respiratory sound monitoring. The accelerometer is based on an asymmetrical gapped cantilever which is composed of a bottom mechanical layer and a top piezoelectric layer separated by a gap. This novel structure helps to increase the sensitivity by orders of magnitude compared with conventional cantilever based accelerometers. The prototype with a resonant frequency of 1100Hz and a total weight of 5 gram is designed, constructed and characterized. The size of the prototype sensor is 35mm×18mm×7.8mm (l×w×t). A built-in charge amplifier is used to amplify the output voltage of the sensor. A sensitivity of 86V/g and a noise floor of 40ng/√Hz are obtained. Preliminary tests for recording both cardiac and respiratory signals are carried out on human body and the new sensor exhibits better performance compared with a high-end electronic stethoscope.
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