基于磁感应技术的心肺活动非接触监测实验研究  

Experimental Study on Non-contact Cardiopulmonary Activity Monitoring Based on The Magnetic Induction Phase Shift Technology

作　　者：袁强[1] 李良杰[1] 许佳[1] 金贵[1] 孙建[1] 秦明新[1] 宁旭[1] 徐林[1] 

机构地区：[1]第三军医大学生物医学工程学院,重庆400038

出　　处：《中国医学物理学杂志》2014年第5期5196-5199,5219,共5页Chinese Journal of Medical Physics

基　　金：国家自然科学基金的资助(No.61372065)

摘　　要：目的:测试一种基于磁感应相移技术的心肺信号非接触监测系统的性能。方法:基于磁感应相移技术的心肺监测系统由激励源,前端传感器(激励线圈、检测线圈),前置放大滤波模块,信号采集模块,信号处理分析与显示模块等组成。激励源可输出两路频率相同、相位不同的正弦信号,一路作为激励信号,一路作为参考信号。激励信号被送至激励线圈,用以产生激励磁场。检测线圈则能检测到感应磁场的磁感应电压信号,并将其送至前置前置放大滤波模块进行预处理。预处理后的信号及参考信号被信号采集模块采集,送至信号处理分析与显示模块进行处理与实时显示。最后用小波分析对显示波形进行去噪处理。基于该系统,对6名受试者的心肺活动的进行了监测。结果:该监测系统成功显示了呼吸运动和心跳运动的实时波形。通过数据分析得到6名受试者的人体呼吸频率监测的最大绝对误差为1次/分钟,最大相对误差为4.55%;心率监测的最大绝对误差为2次/分钟,最大相对误差为3.28%。结论:设计的心肺活动监测系统,能够实现和完成心跳及呼吸活动的非接触监测及实时显示。Objective：To measure the performance of a non-contact cardiopulmonary activities monitoring system based magnetic induction phase shift technique.Methods：The non-contact cardiopulmonary activities monitoring system based magnetic induction phase shift technique includes an excitation source,a front sensor（excitation and detection coils）,a preamplifier and filtering module,a signal acquisition module,and a signal processing,analysis,and displaying module.The excitation source can output two sinusoidal signals of different phases and the same frequency：excitation signal and reference signal.The excitation coil is sent to excitation coil to generate a magnetic excitation field.The detection coil can detect the induced magnetic field induced voltage signal.The self-developed preamp filter module is applied to the magnetic induction voltage signal＇s amplification and filtration.Preprocessed signal and the reference signal are collected signal acquisition module,and are sent to the signal processing analysis and display module for 1processing and real-time display.Finally using the wavelet analysis to denoise the Display waveforms.Based on this system,a human cardiopulmonary activities monitoring experiment is done（6 subjects,male）.Results：This system can monitor cardiopulmonary activities successfully.Through data analysis we can get the 6 subjects＇ maximum absolute error of respiratory frequency is 1 time/minute,while the relative error is 4.55%;the maximum absolute error of heart rate detection is 2 times/minute,and the relative error is 3.28%.Conclusions：The cardiopulmonary activities monitoring system based magnetic induction phase shift technique can monitor the cardiopulmonary activities non-contactly and display the cardiopulmonary activity signals real-timely.

关 键 词：磁感应相移 心肺活动监测 实时 小波分析 

分 类 号：R318[医药卫生—生物医学工程]