基于PT100的高精度温度采集系统设计与实验研究.pdf

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1、第23卷第6期传感技术学报V01．23No．62010年6月CHINESEJOURNALOFSENSORSANDACTUATORSJun．2010TheDesignandExperimentalStudyofHighPreciseTemperatureAcquisitionSystemBasedonPT100ZHANGXiutai，HUXuehui，ZHAIYafang，QINChanghai，ZHANGJijun，1．AInstituteofTechnology，DepartmentofElectronicInformation

2、andElectricalEngineering，AnyangHenan455000，China．＼＼2．XinyangNormalUniversity，CollegeofPhysicsandElectronicEngineering，XinyangHenan464000，China／Abstract：ThedesignandexperimentationofhardwareandsoftwareoftemperatureacquisitionsystembasedonPTIO0areintroduced．Thissystemis

3、comprisedoftheuppercomputerwhichispersonalcomputerandthelowercomputerwhichismainlycomposedoftemperaturesensor，conditioningcircuitsmadeupofinstrumentationampli—tierAD620，A／DconveyorMAX197andmicrocontrollerAT89S52．Thesoftwaresoftheuppercomputerandlowercomputeraredesigne

4、dbasedonVB6．0，andtheC—languagerespectively．ThechangeofthePT100’Sresistancewithtemperatureisconvertedtovoltage’Svarietyunderexcitationofconstantcurrentsource．Conditioningcircuitcarriesoutthemagnificationandconversionofthevoltagesigna1．Theoutputstandardsignalfrom0Vto5Vi

5、stransportedtolowercomputerthroughA／DconverterMAX197．TheconverteddigitaldataaresenttoupperCOB—puterthroughserialcommunicationandarestoredinanddisplayedgraphicresultonit．Thescaleconversionalgo—rithmwhichmeetsthedemandofprecision，isgainedwiththelinearleastsquaresduringt

6、hedifferenttemperaturesectionfortherelationbetweenresistanceandtemperaturebytheaidofMATLAB．ThecomparativetestswithWZ-PB一1typestandardplatinumresistorthermometershowthatthemeasuringaccuracyofthissystemisbetterthan±0．1℃between0℃and100oC．Thetestresultsalsoshowthatthissys

7、temiscredibleandstable．Keywords：PT100；temperatureacquisition；AD620；MAX197；MATLAB；leastsquares；linearfitting；scaleconversionEEACC：7230；7320R基于PTIO0的高精度温度采集系统设计与实验研究张修太，胡雪惠，翟亚芳，秦长海，张继军，1．安阳工学院电子信息与电气工程系，河南安阳455000．＼＼2．信阳师范学院物理电子工程学院，河南信阳464000／摘要：介绍了温度采集系统的硬件、软件设计和实验研究。

8、系统由下位机和上位机构成，下位机硬件主要由温度传感器PT100、由仪用放大器AD620构成的调理电路、A／D转换器MAX197和微控器AT89S52构成，上位机为Pc机。下位机软件用C言语编写，上位机软件用VB6．0设计而成。在恒流源的激励下，PT