抗电磁干扰的心电信号监测系统
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摘要
为了实现电磁干扰环境下的心电信号监测,提出了一种抗电磁干扰的心电信号监测系统。论文给出了输出光电流的计算公式,分析了半波电压及插入损耗对系统灵敏度的影响。利用铌酸锂电光晶体搭建实验系统,测试了5位健康志愿者的心电信号。应用提出的系统和电学心电信号采集系统分别测试了正常环境及电磁环境下志愿者的心电信号。测试结果表明:在正常环境下,本系统能获得与电学心电信号采集系统同样清晰的心电信号波形;在电磁环境下,本系统获得的心电信号优于电学心电信号采集系统。最后定量计算了两者的信噪比,计算结果表明:在电磁干扰下,本系统的信噪比变化量为0.54dB(V2)/0.49dB(V4),而电学心电信号采集系统的信噪比变化量为24.07dB(V2)/16.75dB(V4)。
In order to realize the ECG monitoring under electromagnetic interference environment,an anti-EMI ECG monitoring system based on the optical modulator was proposed in this paper.Firstly,the calculation formula of output photocurrent was discussed,and the influence of half wave voltage and insertion loss on the sensitivity was analyzed.Secondly,the Lithium Niobate(LiNbO3)electrooptic crystal was used to establish experimental setup,and measure the ECG signals of five health subjects.Then the proposed system and electrical ECG acquisition system were used to detect the ECG signals of subjects under both of normal and electromagnetic environments.The measurement results showed that the proposed system could obtain clear ECG signals as same as the electrical ECG acquisition system under normal circumstances,but under the electromagnetic environment,theproposed system could obtain better ECG signals than the electrical ECG acquisition system.Finally,the signal-to-noise ratio(SNR)of the two systems were calculated.The calculation results showed that the SNR change of the proposed system was 0.54 dB(V2)/0.49 dB(V4)under the electromagnetic interference,and the SNR change of electrical ECG signal acquisition system was24.07 dB(V2)/16.75 dB(V4).Therefore,the proposed wearable ECG monitoring system can accurately monitor the ECG under the electromagnetic environment.
In order to realize the ECG monitoring under electromagnetic interference environment,an anti-EMI ECG monitoring system based on the optical modulator was proposed in this paper.Firstly,the calculation formula of output photocurrent was discussed,and the influence of half wave voltage and insertion loss on the sensitivity was analyzed.Secondly,the Lithium Niobate(LiNbO3)electrooptic crystal was used to establish experimental setup,and measure the ECG signals of five health subjects.Then the proposed system and electrical ECG acquisition system were used to detect the ECG signals of subjects under both of normal and electromagnetic environments.The measurement results showed that the proposed system could obtain clear ECG signals as same as the electrical ECG acquisition system under normal circumstances,but under the electromagnetic environment,theproposed system could obtain better ECG signals than the electrical ECG acquisition system.Finally,the signal-to-noise ratio(SNR)of the two systems were calculated.The calculation results showed that the SNR change of the proposed system was 0.54 dB(V2)/0.49 dB(V4)under the electromagnetic interference,and the SNR change of electrical ECG signal acquisition system was24.07 dB(V2)/16.75 dB(V4).Therefore,the proposed wearable ECG monitoring system can accurately monitor the ECG under the electromagnetic environment.
引文
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[17]崔晓琳.12导联心电信号同步采集系统[D].北京:北京交通大学,2008.CUI X L.Synchronous acquisition system of 12-Lead ECG signal[D].Beijing:Beijing Jiaotong University,2008.(in Chinese)
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[20]BAMAROUFF,CRANDELL C,TSUYUKI S,et al..Cloud-based real-time heart monitoring and ECG signal processing[C].Proceedings of 2016IEEE Sensors,IEEE,2016:1-3.
[21]刘国福,杨俊.微弱信号检测技术[M].北京:机械工业出版社,2014.LIU G F,YANG J.Detection Technology of Weak Signal[M].Beijing:China Machine Press,2014.(in Chinese)
[2]封顺天.可穿戴设备在医疗健康领域的关键技术及应用场景分析[J].电信技术,2016(5):32-34.FENG SH T.Key technology and application scenario analysis in medical health field of wearable devices[J].Telecommunications Technology,2016(5):32-34.(in Chinese)
[3]CHINOS,ISHIZAWA H,HOSOYA S,et al..Research for wearable multiple vital sign sensor using fiber Bragg grating-verification of several pulsate points in human body surface[C].Proceedings of 2017 IEEE International Instrumentation and Measurement Technology Conference(I2 MTC),IEEE,2017:1-6.
[4]朱长发,蔡宏伟,刘雯.复杂电磁环境下医疗设备存在的问题及其对策[J].医疗卫生装备,2009,30(2):114-115,117.ZHU CH F,CAI H W,LIU W.Existent question and strategy of medical equipment under complex electromagnetic environment[J].Chinese Medical Equipment Journal,2009,30(2):114-115,117.(in Chinese)
[5]FENSLIR,GUNNARSON E,GUNDERSEN T.A wearable ECG-recording system for continuous arrhythmia monitoring in a wireless Tele-home-care situation[C].Proceedings of the 18th IEEE Symposium on Computer-Based Medical Systems,IEEE,2005:407-412.
[6]YOOJ,YAN L,LEE S,et al..A wearable ECG acquisition system with compact planar-fashionable circuit board-based shirt[J].IEEE Transactions on Information Technology in Biomedicine,2009,13(6):897-902.
[7]NEMATIE,DEEN M J,MONDAL T.A wireless wearable ECG sensor for long-term applications[J].IEEE Communications Magazine,2012,50(1):36-43.
[8]张舜,连宇茜,秦亚杰,等.基于安卓4.3的移动心电监护系统设计[J].中国医疗器械杂志,2015,39(4):261-264.ZHANG SH,LIAN Y X,QIN Y J,et al..Design of the mobile ECG monitoring system based on Android 4.3[J].Chinese Journal of Medical Instrumentation,2015,39(4):261-264.(in Chinese)
[9]李皙茹,许金林,李晓风,等.一种基于绿光的可穿戴式光电容积脉搏波测量系统[J].现代电子技术,2016,39(20):125-128.LI X R,XU J L,LI X F,et al..A wearable photoplethysmography measurement system based on green light[J].Modern Electronics Technique,2016,39(20):125-128.(in Chinese)
[10]王丽清,苗长云,张诚.基于微结构法布里-珀罗干涉仪的光纤光栅脉搏波解调方法[J].中国激光,2017,44(10):1004002.WANG L Q,MIAO CH Y,ZHANG CH.Demodulation method of fiber Bragg grating pulse wave based on micro-structure Fabry-Perot interferometer[J].Chinese Journal of Lasers,2017,44(10):1004002.(in Chinese)
[11]陈会娟,苗长云,高华,等.基于光纤光栅传感器的人体心率测量技术研究[J].激光与红外,2009,39(12):1317-1320.CHEN H J,MIAO CH Y,GAO H,et al..Research on human heartrate measurement based on fiber Bragg grating sensor technology[J].Laser&Infrared,2009,39(12):1317-1320.(in Chinese)
[12]MIHAILOVS J.Fiber Bragg grating sensors for harsh environments[J].Sensors,2012,12(2):1898-1918.
[13]AMELARDR,SCHARFENBERGER C,KAZEMZADEH F,et al..Feasibility of long-distance heart rate monitoring using transmittance photoplethysmographic imaging(PPGI)[J].Scientific Reports,2015,5:14637.
[14]FERNANDESM S,CORREIA J H,MENDES P M.Electro-optic acquisition system for ECG wearable sensor applications[J].Sensors and Actuators A:Physical,2013,203:316-323.
[15]FERNANDESM S,CORREIA J H,MENDES P M.Electro-optic electrodes based on lithium niobate Mach Zhender interferometer modulators for wearable bioelectric activity recording[J].Proceedings of SPIE,2011,8001:80010Y.
[16]李中健,井艳,李世锋,等.心电图波形特征分析[J].临床心血管病杂志,2008,24(3):195-197.LI ZH J,JING Y,LI SH F,et al..Analysis on characteristics of electrocardiograms[J].Journal of Clinical Cardiology,2008,24(3):195-197.(in Chinese)
[17]崔晓琳.12导联心电信号同步采集系统[D].北京:北京交通大学,2008.CUI X L.Synchronous acquisition system of 12-Lead ECG signal[D].Beijing:Beijing Jiaotong University,2008.(in Chinese)
[18]HAMPTON J R.The ECG in Practice[M].6th ed.New York:Elsevier Health Sciences,2013.
[19]YANGX F,CHEN ZH H,ELVIN C S M,et al..Textile fiber optic microbend sensor used for heartbeat and respiration monitoring[J].IEEE Sensors Journal,2015,15(2):757-761.
[20]BAMAROUFF,CRANDELL C,TSUYUKI S,et al..Cloud-based real-time heart monitoring and ECG signal processing[C].Proceedings of 2016IEEE Sensors,IEEE,2016:1-3.
[21]刘国福,杨俊.微弱信号检测技术[M].北京:机械工业出版社,2014.LIU G F,YANG J.Detection Technology of Weak Signal[M].Beijing:China Machine Press,2014.(in Chinese)