数字相控阵超声检测系统时间延迟精度分析

281200802JournalofProjectiles,Rockets,MissilesandGuidanceVol.28No.1Feb2008数字相控阵超声检测系统时间延迟精度分析*李媛,王召巴,赵霞(,030051):,,,,:;;;:TB3025:ATheAnalysisofTimedelayPrecisionontheDigitalPhasedArrayUltrasonicTestingSystemLIYuan,WANGZhaoba,ZHAOXia(StateKeyLaboratoryofElectronicTestTechnology,NorthUniversityofChina,Taiyuan030051,China)Abstract:Theinfluenceoftimedelayaccuracyonphasedeviationwasanalyzedbasedonthebeamcontroltheoryandexperimentalsimulation,therelationshipbetweentimedelayaccuracyandsystemresolutiononspaceandcontrastwasalsostudied.Severalnoticesaboutrealsystemdesignweregiven.Theresearchresultsprovideimportanttheoriesandreferencesfordomesticdevelopmentofdigitalphasedarrayultrasonictestingsystem.Keywords:phasedarray;timedelayaccuracy;spatialresolution;contrastresolution1,,,,,,[1],,/,,,[2],,,,,,2,,:n=ndsin/c(1):n;d;c,n,1*:2007-02-02:(9140C1204010607):(1981-),,,,:1:1nmmnt0,,,:n=ndsinc-mnt0(2),,wwn,w0:n=-w0n,ww0,:n=(w-w0)n(3),=0,0,,3,[3],D.K.Peterson,,,[4](4):S=(1-sinc(1/)Nsinc(1/))12(6N)1/2(1)(4):N;228163264128,:,N,;N,,,4,,[3]4.13,,,,,344,P,,,(5):19528n=Fc{1-[1+(ndF)2-2ndFsin]1/2}+0(5):F;0;nn,n=0,1,(N-1)/2,,n(n+0.5),()(n=(N-1)/2),,(5)F:F=1c{1-[1+((N-1)d2F)2]1/2}+(N-1)2d24F2c1+((N-1)d2F)2-1(6)(6):,,NdFNdF,5(6),(),:(c=5920m/s),N=15,d=10mm=10ns,100mm,17mm5,,,,4.2,,,(1):=(N-1)d2ccos(7)66,,4,,,,;,,,,5,,,,:[1].[D].:,2003.[2].[M].:,2002.[3],,,.[J].,1997,19(4):91-94.[4]PetersonDK,KinoGS.Realtimedigitalimagereconsruction:Adescriptiveofimaginghardwareandanalysisofquantitativeerrors[J].IEEETransactionsonSonicsandUltrasonics,1984,31(4):337-351.196