单片机脉象信号系统采集(最终)

辽宁科技大学毕业生设计（论文）第I页单片机脉象信号系统采集摘要脉诊在中医占很重要的地位，通过脉诊可以了解患者脏腑气血的盛衰，可以探测病因、病位、预测疗效等。本文设计了一套数据采集的基本电路。即6路脉象信号共用一路放大、滤波和A/D转换电路，采集6路信号时，采用了单个通道循环采集的方法，通过模拟开关把传感器提取出来的信号取其中的一路逐个进行放大、滤波处理，把传感器提取的约为5mV的信号放大为约5V左右，并滤除其中的高频部分，设计了一个50Hz陷波器，对信号中存在的50Hz工频干扰进行了专门滤除；CPU模块主要由微控制器AT89C51构成主控器件，完成对整个系统的控制作用。本论文还对电源部分进行了专门的设计，可以采用电池和直接市电供电。关键词：脉象;循环采集;单片机;稳压器辽宁科技大学毕业生设计（论文）第II页SCMPulseSignalAcquisitionSystemAbstractPlusdiagnosingisvaluedhighlyinherbalism．Theeatandflowofviscusofpatients’,canbeknownbyplusdiagnosing,whichcanalsobeusedtodetectthereasonandpositionofdiseaseandforecasttheeffectofcure．Inthispaper,designasetofbasicdataacquisitioncircuit．6-channelpulsesignalthatissharedalongthewayamplification,filteringandA/Dconversioncircuit,6-channelsignalacquisitionusingasingleaccesscyclecollectionmethods,throughanalogswitchestosensorsignalextractedfromthemonebyoneallthewaytozoom,filterprocessing,thesensorisabout5mVextractedsomeofthesignalamplificationofabout5V,andfilteroutthehigh-frequencypartofthedesignofa50Hznotchfilteronthesignalinthe50Hzfrequencytheexistenceofaspecialinterferencefilter；CPUmodulesmainlybythemicrocontrollerAT89C51constitutecontroldevices,tocompletecontroloftheentiresystem．Inthispaper,alsopartofaspecialpowersupplyisdesignedtodirecttheuseofbatteriesandelectricitysupply．Keywords：Pulse;recyclingcollection;single-chipmicrocomputer;Regulators辽宁科技大学毕业生设计（论文）第III页目录1绪论......................................................................................................................................11.1中医脉象研究的意义与特点.........................................................................................11.2国内外研究背景.............................................................................................................21.3主要工作.........................................................................................................................32系统方案选择...................................................................................................................42.1提取脉象信号的方案.....................................................................................................42.1.1脉象信号的特点.......................................................................................................42.1.2脉象信号提取的具体方案.......................................................................................52.2调理电路设计................................................................................................................102.2.1放大电路的设计和选取..........................................................................................102.2.2模拟滤波器的设计和实现.....................................................................................142.3A/D转换电路的设计.....................................................................................................153系统软硬件结合.............................................................................................................173.1主放大前置电路...........................................................................................................173.2主放大电路与滤波电路的设计...................................................................................183.2.1主放大电路AD624G100管脚...............................................................................183.2.2二阶BUTTERWORTH低通滤波器.............................................................................183.2.350HZ陷波电路.........................................................................................................193.3ADC转换电路的设计...................................................................................................203.3.1单片机串口通信设置及程序设计.........................................................................253.4AT89C51单片机与PC机之间电平转换硬件接口.....................................................284电源设计...........................................................................................................................304.1直流稳压电源概述.......................................................................................................304.2电源的选择...................................................................................................................314.2.1电池供电系统中的稳压器选择.............................................................................314.2.2市电供电系统中的稳压器选择.............................................................................33结论.........................................................................................................................................34辽宁科技大学毕业生设计（论文）第IV页致谢.........................................................................................................................................35参考文献...............................................................................................................................36辽宁科技大学毕业生设计（论文）第1页1绪论1.1中医脉象研究的意义与特点脉诊在中医“望、闻、问、切”四诊中占很重要的地位。《素问·五脏生成篇》指出：“五脏相音，可以意识，五色微诊，可以目察，能合色脉，可以万全。”《景岳全书》“脉者，血气之神，邪气之鉴也，有诸内必形诸外，故血气盛者脉必盛，血气衰者脉必衰，无病者脉必正，有病者脉必乖。”总之，中医对脉诊是十分重视的，认为通过脉诊可以了解患者脏腑气血的盛衰，可以探测病因、病位、预测疗效等。人体心室周期性的收缩和舒张导致主动脉的收缩和舒张，使血流压力以波的形式从主动脉根部开始沿着整个动脉系统传播，这种波称为脉象