【作者】 刘敏；

【导师】 张加宏； 何野；

【作者基本信息】 南京信息工程大学 ， 电子与通信工程（专业学位）， 2018， 硕士

【摘要】 随着经济的飞速发展,不断加快的生活节奏使得心脏疾病的患者人数在不断增多,心率作为人体最重要的生理指标,反映着人体心血管的基本健康状况,因此对心率长期监测是心脏疾病预防的首要环节。为减小监护人的监护压力,提高心率监测仪的测量速度与精度,本文设计与实现了一种基于压电电缆的非接触式心率监测系统。本文研制的非接触式心率监测仪在不让监测者产生任何心理影响的前提下,解决了心率监测的复杂性,主要运用小波变换对监测仪采集的BCG信号进行去噪处理,重点讨论不同小波函数与不同分解尺度下信号去噪效果的差异性,选择合适的小波函数分解尺度极大地提高了心率信号提取的准确性。本监测仪还具有体动监测功能,并且设计了脑波音乐模块,用于调节人体的情绪。该监测仪与传统方式心率信号监测仪的对比结果表明非接触式监测系统在监测过程中具有更好的实时性与可靠性,实验测试结果表明,在静止状态和运动后状态下,本监测仪的心率检测整体平均误差小于±4次/分钟。本设计中采用的蛇形压电电缆,其屏蔽性好,相对于昂贵的压电薄膜,价格低廉,易于被大众接受。此外,通过蓝牙实现了上位机与下位机的实时无线通信和数据存储,使监测仪显示直观,使用方便,而且通过无线通信技术使监测系统对人具有无约束性,符合未来心率信号监测的发展方向。更多还原

【Abstract】 With the continuous development of the economy and the ever-accelerating pace of life,the number of patients suffering from heart disease is increasing.The heart rate,as the most important physiological index of the human body,reflects the basic health status of the human cardiovascular system,so the long-term monitoring of the heart rate is the first step in heart disease prevention.In order to reduce the guardian’s monitoring pressure and improve the heart rate measurement speed and accuracy,a non-contact heart rate monitoring system based on piezoelectric cables is designed and implemented in this paper.The heart rate measurement system developed in this paper solves the complexity of heart rate monitoring without letting the tester have any psychological influence.The wavelet transform is used to denoise the BCG signal collected by the system,and different wavelet functions and different decomposition scales are discussed for the difference of the signal denoising effect.Selecting the appropriate wavelet function decomposition scale greatly improves the accuracy of the heart rate signal extraction.The system also has a body motion detection function and a brainwave music module is designed to regulate the body’s emotions.The comparison of the heart rate signal measurement of the system with the traditional method shows that the non-contact monitoring system has better real-time performance and reliability in the detection process.Experimental test results show that the overall average error of the heart rate detection of the monitor is less than ±4 beats/minute in the static state and the post-exercise state.The snake-shaped piezoelectric cable used in this design has a good shielding property and is relatively inexpensive and easy to be accepted by the masses in comparison with expensive piezoelectric films.In addition,the real-time wireless communication and data storage between the upper computer and the lower computer are achieved through Bluetooth,which makes the system display intuitive and convenient for users,and the wireless communication technology enables the measurement to be unrestrained to humans,which is in line with the development direction of the future heart rate signal monitoring.更多还原