（博）Signal processing and experimental technology in ultrasonic flow measurement.pdf

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1、SignalProcessingandExperimentalTechnologyinUltrasonicFlowMeasurementDepartment12—MechanicalEngineeringUniversityofDuisburg—EssenGrantedDissertationforAcquisitionofAcademicDegreeofDoctorofEngineeringSubmittedbyM.Sc.YaoyingLinfromPingxiang,ChinaDateoforal

2、examination:30.November,2004Chariman:Prof.Dr.-Ing.D.WissussekExperts:Prof.Dr.-Ing.V.HansProf.Dr.-Ing.R.TrachtProf.Dr.-Ing.L.WangPrefacePrefaceThisdissertationrecordsallresearchworkIhavedoneinthepasttwoyearssinceIcametoGermanyandstudiedunderthesupervisio

3、nofProfessorDr.HansattheUniversityofDuisburg-Essen.FirstImustgivespecialthankstomysupervisor,ProfessorDr.Hans,forhishelpwithmyresearchworkevenafterhisretirement.Thatheisstrictinresearchwillbeforeverrememberedbymeandinfluencemyfuturework.Hisoptimisticcha

4、racteralsohelpedmethroughthedifficultperiodoftime.I’dliketothankProfessorDr.Trachtfortakingtimeoutofhistightscheduletoreviewmydissertation.ThediscussionwithhimbenefitsboththisdissertationandmemyselfsomuchthatIwillneverforget.ImustthankProfessorDr.Wang,a

5、tCDHKofTongjiUniversity,Shanghaiforhissupportandencouragement.ItishewhogavemethischancetofinishthisdissertationinGermany.IshouldalsothankmycolleaguesintheInstituteofMeasurementandControlfortheircooperationandfriendlyhelp.Anotherspecialgratitudeowestomyh

6、usband,fromwhomIalwaysgetsupportandunderstanding.September2004,inEssenYaoyingLinContentsContents1Introduction..................................................................................................................................12Technologies

7、inflowmeasurement.............................................................................................42.1Classificationofflowmeters................................................................................................42.1.1Extractivee

8、nergyapproach.........................................................................................42.1.2Additiveenergyapproach............................................................................................62.2Cha