兩種數(shù)字渦街流量計的硬件研制.pdf

1、合肥工業(yè)大學碩士學位論文兩種數(shù)字渦街流量計的硬件研制姓名：劉三山申請學位級別：碩士專業(yè)：檢測技術與自動化裝置指導教師：徐科軍20090301DevelopmentofHardwarefortwokindsofDigital場rtexFlowmetersAbstractDigitalsignalprocessingtechnologyandlowpowertechnologyhavebeenthehotspotsofresearching

2、vortexflowmetersinrecentyearsAccordingtodifferentapplicationsandrequirementsofourpartners，wedevelopedtwokindsofdigitalvortexflowmetersOneisthemicrocontrollerMSP430baseddigitalvortexflowmeterwithlow—powerandtwo—wire，andth

3、eotheristhedigitalsignalprocessor—dsPICbaseddigitalvortexflowmeterwithhighantijammingabilityThedigitalVortexFlowmeterwithlowpowerandtwowirecombinesthedigitalspectralanalysiswithanalogband—passfilterstofilternoisescontain

4、edinthevortexsignalwiththegreatestextentandwerksatlow—powerInordertoprovidethemaximumcurrentforthemetertheDC／DCwithhighefficiencyandlow—powerisusedforconvertingpowerfromhighvoltageinthesystemAkindofdifferentialamplifieri

5、sdevelopedusingthreeamplifierstoacquirethevortexsignaleffectivelyandfilterthecommon—modenoiseThetemperatureandpressurecompensationmoduleisbuiltSOastomeasurethegasflowrateaccuratelyThedigitalvortexflowmeterwithhighantijam

6、mingabilityadoptsboththespectralanalysisbasedonFFTandthenotchfiltertoprocesstheoutputsignalofvortexsensor，andextractstheflowrateinformationfromnoisyvortexsensorsignalTheisolatedDC／DCpowermoduleisutilizedtomeettherequirem

7、entsofthetypicaltestsforvortexflowmeterThecommunicationbetweenthemeterandtheupper—systemisimplementedthroughtheisolatedcommunicationportKeywords：VortexFlowmeters；lowpower；spectralanalysis；bandpassfilter；hi班antijammingabi