┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊毕业设计（论文）说明书第页摘要温度的精密控制对现代企业生产的影响越来越深，而高精度的温度测量技术是决定温度控制精度的前提。随着温度控制精度的进一步提高，普通的测温传感器已经无法满足生产的需求，而且在现场的生产环境中存在大量的干扰，要求温度测量装置在满足高精度的前提下，还要求高稳定性和强抗干扰性。本文在综合多种的测温技术方案的前提之下，决定采用MC9S12XS128单片机为核心控制芯片，以非平衡桥来驱动三线制Pt1000铂电阻测温电路，并且对温度测量系统中涉及的非平衡电桥、信号调理电路、控制算法等部分的机构和原理进行了初步研究。系统通过单片机的片内A/D模块，把测温电桥的输出信号采集到单片机内部，再设定和调试相关参数，把温度数据通过RS232串口线上传给上位机，再由上位机进行控制及相关参数的实时显示和记录。通过多次试验，该测温系统能够可靠的工作。关键词：温度测量单片机RS232电阻测温器AbstractPrecisetemperaturecontrolhastheincreasinginfluenceonthemodernenterpriseproducing,andhigh-precisiontemperaturemeasurementtechniqueistodeterminetheaccuracyoftemperaturecontrolofthepremise.Withthefurtherimprovingoftheprecisionoftemperaturecontrol,theordinarytemperaturesensorhasbeenunabletomeetproductionneeds,andthereisalotofinterferenceintheproductionenvironments.Thetemperaturemeasuringdeviceshastomeettherequirementsunderthepremiseofhighaccuracy,highstabilityandstronganti-interferencealsoshouldbeconsidered.AftercomparingthevarietyoftemperaturemeasurementwedecidedtoadoptMC9S12XS128microcontrollerasthecorecontrolchip,thethree-wirePt1000platinumresistancedrivedbyunbalancedbridgeastemperaturemeasurementcircuit.Westudiedsignalconditioningcircuitry,controlalgorithmsandotherpartsofthebody.ThesystemsampledoutputsignalofthebridgeofthetemperaturetotheinternalmicrocontrollerthroughA/Dmodule,thensettherelevantparameters,thetemperaturedataviaRS232seriallinetothehostcomputer,andthenbecontrolledbythehostcomputertodisplayandtorecordrelatedparameters.Throughseveralexperiments,thetemperaturemeasurementsystemcanworkreliably.Keywords:Temperaturedetection,Microcontroller,232Bus,RTD(ResistanceTemperatureDetector)TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc358320532"摘要PAGEREF_Toc358320532\h1HYPERLINK\l"_Toc358320533"AbstractPAGEREF_Toc358320533\h2HYPERLINK\l"_Toc358320534"第一章绪论PAGEREF_Toc358320534\h6HYPERLINK\l"_Toc358320535"1.1研究背景PAGEREF_Toc358320535\h6HYPERLINK\l"_Toc35