Design of the MEMS Piezoresistive Electronic Heart Sound Sensor.
This paper proposes the electronic heart sound sensor, based on the piezoresistive principle and MEMS (Micro-Electro-Mechanical System) technology. Firstly, according to the characteristics of heart sound detection, the double-beam-block microstructure has been proposed, and the theoretical analysis and finite element method (FEM) simulation have been carried out. Combined with the natural frequency response of the heart sound (20~600 Hz), its structure sizes have been determined. Secondly, the processing technology of the microstructure with the stress concentration grooves has been developed. The material and sizes of the package have been determined by the three-layer medium transmission principle. Lastly, the MEMS piezoresistive electronic heart sound sensor has been tested compared with the 3200-type electronic stethoscope from 3M (São Paulo, MN, USA). The test results show that the heart sound waveform tested by the MEMS electronic heart sound sensor are almost the same as that tested by the 3200-type electronic stethoscope. Moreover, its signal-to-noise ratio is significantly higher. Compared with the traditional stethoscope, the MEMS heart sound sensor can provide the first and second heart sounds containing more abundant information about the lesion. Compared with the 3200-type electronic stethoscope from 3M, it has better performance and lower cost.
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China. zhangguojun1977@nuc.edu.cn.|Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. zhangguojun1977@nuc.edu.cn.
Guojun
G
Zhang
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China. liumengran1991@163.com.|Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. liumengran1991@163.com.
Mengran
M
Liu
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China. guonan0902@163.com.|Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. guonan0902@163.com.
Nan
N
Guo
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China. zhangwendongnuc@163.com.|Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. zhangwendongnuc@163.com.
Wendong
W
Zhang
D004867:Equipment Design; D020342:Finite Element Analysis; D055617:Micro-Electrical-Mechanical Systems / Q000379:methods*; D012815:Signal Processing, Computer-Assisted; D059629:Signal-To-Noise Ratio; D019023:Stethoscopes
MEMS; heart sound sensor; signal-to-noise ratio; stress concentration