基于dsp的超声波气体流量传感器

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1、万方数据江苏大学硕士学位论文ABSTRACTInrecentyears，moreandmoreultrasonicgasflowsensorsareusedextensivelyComparedtootherflowmeters，ultrasonicflowmeterhasthecontactlessstructure．Ithasanadvantageofnotdestroyingtheactivecharacteristicofthefluid．Theultrasonicflowsensorusedinthisarticleissuit

2、ablefortheoccasionoflowvelocity，smallfloworliRlepipesize．Duetobeingusedinmedical，theflowmeterisrequiredhavehighprecisionandeasytomaintain．Inthispaper，startingfromtheworkingprincipleofultrasonicgasflowmeter，themodifiedparallelinstallationformofultrasonictransducerWasused．A

3、tthesametime，theauthormadeaconcreteanalysisonthemechanismofthetimedifferencemethodtomeasuretheflow．Fromtheacousticsignal，theflowfieldinsidethepipe，mechanicalfactors，humanfactorsandenvironmentalfactors，thispaperanalyzedtheimpactfactorsofultrasonicsignalmeasurementerror．Acc

4、ordingtovariouserrorconditionsitalsodesignedthecorrespondingsolutions．Combiningwiththeexistingtheoreticalanalysis，thispaperdesignedthehardwarecircuitmoduleofultrasonicflowdetectionsystem．Italsostudiedtheselectionofeverycircuitmoduleandthematchingperformance．Thispaperestab

5、lishedthemodelofthesignalcomingfromtheultrasonictransducerbytheDSPtothemulti—channelanalogswitchthentotheamplifier．ThroughthefilterthesignalcamebacktotheDSPforA／Dsampling．FinallywedesignedatemperaturemeasuringcircuitfortemperatureacquisitionAccordingtothecircuits，software

6、processingmethodoftheacousticsignalwasstudied．Byusingthecross—correlationalgorithmwecancalculatethepropagationtimeofthesignal．Atthesanletime，throughtheA／DprogramitmeasuredthetemperatureofthegasInMATLABthefiguresCanshowtheresultofalgorithm．Inrealflowmeasurementandnoflowtes

7、tingcondition，cross—correlationwaveisobtained．TheexperimentresultsunderrealflowshowthattheultrasonicgasflowdetectionsystemCanoperatereliably．Alsothedataresultsatisfiestherequirementofexperiment．AtIII万方数据基于DSP的超声波气体流量传感器thesainetime．itiSfitfortheactualsituation．Thetestresu

8、ltsunderzeroflowconditionsshowthattheflowmeterworkswell．Itdosenotproducetheflowdrifterror．Moreov