陶瓷电容式智能压力变送器

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1、中国科学技术大学硕士学位论文陶瓷电容式智能压力变送器姓名：李鹏申请学位级别：硕士专业：检测技术与自动化装置指导教师：李民强20070501中国科学技术大学硕f。学位论文AbstractIntelligentpressuretransmitter,asakindofequipmentformodemindustrypressuremeasuringandprocesscontrolling，isgettingmoreandmorerelianceandapplicationbecauseofitsexcellentmeasurementaccuracy,stability，depend

2、ence．It’scriticalimportanttoresearchmoreaccurate，morestableandmorereliablepressuretransmitterbecauseofitsextensiveuse，hugemarketandmorehi【ghandhighrequirementbyindustry，Ceramiccapacitorpressureintelligenttransmitteriscomposedoftheinformationacquisitioncomponent--ceramiccapacitorpressuresensorwi

3、thdualcapacity，primarytemperaturecompensationandnonlinearitycompensation，thesigrlalconditioningcircuitAD7745whichWasusedtOtranslatecapacityinformationinto24BITsignalinformationandcanbesetupaccordingtoapplicationrequirementssuchascapacitorinputrange，operationmode．conversionrateetc，microcontrolle

4、rMSP430whichcallbeusedtoprovidetemperaturecompensation,zerodriftcompensation,nonlinearitycompensation，sensitivitydriftcompensation，digitalfiltering，industrystandardcurrentloopconversioncircuitAD421whichcalltranslateMSP430processingoutcomeintocurrentloop4-20mA．Thispaperproposeahighpreciseandhigh

5、dependableintelligentpressuretransmitterdesignplan，makepressuretransmitterinformationacquisitionandprocessingmodular,digital，intelligentandautomatic．ThisthesismainlyresolveAD7745signalconditioningsettingup，izCcommunicationprotocol，kindsofcompensationprograms’algorithmdesignandcoding，MSP430USART

6、communicationere．Chapteroneintroducesintelligentpressuretransmitter’Sresearchmeaningandvalue，historyandpresentsituation,contrastkindsofpressuretransmitterperformance，listtheemphases，difficulties，innovationsofintelligentpressuretransmitterdesign，generalizeceramiccapacitorpressuretransmitterperfo

7、rmance：chaptertwoanalyzesandcontrastskindsofpressuresensor'sperformanceandstructure，determinatespressuresensortypeandstructure，thenintroducespressuresensor’smanufactureprocessanditsinterfacewithAD7745：InchapterthreeweintroduceAD77