摘要
表面肌电信号是人体表面肌肉通过收缩产生的生物电,能够反应人体肌肉的活动状况,在医学领域有重要的研究价值。由于表面肌电信号是微弱信号,较小的噪声就能产生较大的干扰;针对其这一弱点,本文设计了一款体积小、功耗低、抗干扰能力强的表面肌电信号采集系统。设计使用AD8232作为采集芯片,结合放大、滤波、模数转换电路,使用STM32进行数据处理,最后将数据通过低功耗蓝牙发送到上位机。测试结果表明:表面肌电信号能量主要集中在50~150 Hz,300 Hz以上明显衰减,受低频信号干扰较大。经过硬件滤波与小波降噪算法处理后,干扰得到较好抑制,尤其对低频干扰有显著衰减。系统有较强的抗干扰能力和可靠性,有着良好的市场前景。
Surface electromyography is the bioelectricity generated by the contraction of human surface muscles,whichcan reflect the activity of human muscles,It has important research value in the medical field.Because the surface EMG signal is a weak signal,the smaller noise can produce larger interference.Aiming at this weakness,In this paper,a surface EMG signal acquisition system with small volume,low power consumption and strong anti-interference ability is designed.AD8232 is designed as the acquisition chip,combined with amplification,filtering and analog-to-digital conversion circuits,and STM32 is used for data processing.Finally,the data is sent to the host computer through lowpower Bluetooth.The test results show that the energy of surface EMG signal is mainly concentrated in 50~150 Hz,Above 300Hz,it obviously attenuates,and is greatly disturbed by low-frequency signals.After hardware filtering and wavelet denoising algorithm,Interference is well inhibit,Especially for low frequency interference.The system has strong anti-interference ability and reliability,and has a good market prospect.
作者
张锐浩
李昀泽
党立志
洪应平
Zhang Ruihao;Li Yunze;Dang Lizhi;Hong Yingping(State Key Laboratory of Electronic Testing Technology,North University of China,Taiyuan 030051,China;Key Laboratory of Instrument Science and Dynamic Testing,Ministry of Education,Taiyuan 030051,China)
出处
《电子测量技术》
北大核心
2023年第6期173-177,共5页
Electronic Measurement Technology
