基于LabVIEW的频谱分析仪的设计

103620101216711815(2010)36909004ScienceTechnologyandEngineeringVol10No36Dec20102010SciTechEngng基于LabVIEW的频谱分析仪的设计杨金孝杨永坤*郭德春张永波(,710129)摘要基于LabVIEW在测控领域的广泛使用,应用数据采集卡采集模拟信号,设计了一种频谱分析仪由数据采集卡收集到现场信号,经过所设计的频谱分析仪对采集到的数字信号进行分析在频谱分析仪的设计中,实现了一种新的频率细化方法在LabVIEW环境下的实现,比较好地改善了频谱分析的准确度和灵活性关键词LabVIEW数据采集频谱分析频率细化中图法分类号TM935.1;文献标志码A20101012:(1964),,,,:*:(1984),,,,:LabVIEWNI,,,[1],LabVIEW[2],,1系统总体设计NI4461,PCILabVIEW,1,,LabVIEW,,LabVIEW1LabVIEWMAX(Measurement&AutomationExplorer),NIDAQmx,[3]NI4461NI,MAX,LabVIEW[4],222;,;[5];LabVIEW,32系统设计原理,3,,,LabVIEW,44x(n),NDFT(1)X(k)=N-1n=0x(n)WnkN(1)f=fs/Nf1f2,x(n)f1f2,y(n)F0=f1,y(n)e-j2F0fs,:y(n)=y(n)e-j2F0/fs=y(n)cos2F0fs-jy(n)sin2F0fs(2)ycos(n)=y(n)cos2F0fsysin(n)=y(n)sin2F0fs,:ycos(n)ycos(n);ysin(n)ysin(n)ycos(n)ysin(n),D()fm=fm/D,909136,:LabVIEWN[6],f=fm=fm/ND,DDFT:DFTax1[k]+bx2[k]=aDFTx1[k]+bDFTx2[k](3)(3),DFTycos(n)ysin(n)(2)yn,cos2F0fssin2F0fs,y(n),cos2F0fssin2F0fsDFT,ycos(n)ysin(n)DFTYcos(k)Ysin(k)0(f2-f1)f1f2,[7],,,3系统测试结果,100,2Hz0.02Hz,,54结论LabVIEW,LabVIEW,,LabVIEW,,,,59092101,,.LabVIEW.:,20032BilskiP.WiniecW.Virtualspectrumanalyzerbasedondataacquisitioncard,IEEETransonInstruandMeas,2002;51(1):82873,,,..,2006;(7):27294,,,.LabVIEW.,2003;(6):28295,,.,2008;(8):80856,.LabVIEW,2006;(10):94967,,..,2001;(12):1725VirtualSpectrumAnalyzerBasedonLabVIEWYANGJinxiao,YANGYongkun*,GUODechun,ZHANGYongbo(NorthwesternPolytechnicalUniversity,Xian710129,P.R.China)[Abstract]BasedonthespreadofLabVIEWinmeasuremen,taspectrumanalyzerinsoftwareentertainmentisdesigned.WhenthedataacquiredinDAQisanalyzedinthedesignedspectrumanalyzer,theresultdemonstratestheaccuracyandtheflexibilityofthesystem.Withtheuseofanewmethodoffrequencyrefinemen,ttheresultisimprovedgreatly.[Keywords]LabVIEWDAQspectrumanalysisfrequencyrefinement(上接第9089页)MultiphaseFlowControlSystemBasedonPLCandWINCCZOULin1,SONGChuanjun1,2,ZHANGDawei1(CollegeofElectricityInformationEngineering,NortheastPetroleumUniversity1,DaqingOilfieldGeneralHospital2,Daqing163318,P.R.China)[Abstract]Multiphaseflowwasexistedintheoilindustrywidely,thecontrolsystemwasanessentialintegralpartofmultiphasetransportprocess.Tomeettheneedsofmultiphasetransportprocess,fortheimportanceofsafeoperationofprocessequipmen,tstudythemultiphaseflowcontrolsystem.TheapplicationofPLCandWINCCindustrialconfigurationsoftwareinthefieldofmultiphaseflowisproposed.[Keywords]multiphaseflowcontrolPLCWINCC909336,:LabVIEW