距离-百分比曲线在管道焊缝超声探伤中的应用

2(,075131)APPLICATIONOFTHEDISTANCE-PERCENTAGECURVETOULTRASONICINSPECTIONOFTUBEWELDSWANGFei(No.1PowerConstructionCompanyofShanxiProvince,Xuanhua075131,China):TG115.28+5:B:100026656(2001)03201242022,dB,,,2dB;,,,2[1],,2dB,,2,,125,610mm28mm,CTS222A,K=2.5,L0=14mm1.12(1)11(2)RB2310mm3mm40mm,90%,1,dB(56dB)(3),20,30,40,5060mm3mm40mm,,2,3,4,56,,(1):2000204203121.221.2.13mm40mm-20dB,4dB,32dB1.2.2,,;,,52dB(4dB3mm40mm),=3mm40mm-52dB+=3mm40mm-(52-)dB16mm,,,42dB,=3mm40mm-(52-42)dB=3mm40mm-10dB42123320013NDTVol.23No.3Mar.2001©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Ê,,6dB,6dB,,,5mm22.1--dB(1)2,,;2dB,(),,,,dB,(2)2,,,2dB,DLöT5048-1995[2],(3mm40mm-14dB3mm40mm-10dB),2mm15mm-18dB,22.22(2300CTS236)DAC,2,,(dB),22.322,,(5%),:(1),90%100%(2),d1(d1=(a+L0)öK),d1(3),,,(90%),32dB,2,;,:[1],.[M].:,1989.174-175.[2]DLöT5048-1995,[S].(118),,,,,,:[1].[M].:,1995.[2]DavidMPozar.MicrowaveEngineering[M].NewYork:Addison2WesleyPublishingCompany,1990.[3]BovingKG.NDEHandbook[M].Denmark:DanishTechPress,1989.[4]AuldBA.Theoryofferromagneticresonanceprobesforsurfacecracksinmetals[R].Stanford:StanfordUniversity,1978.[5]HuberAbiriCH.Modelingofsurfacehairlinecrackdetectioninmetalsundercoatingsusingopen2endedrectangularwaveguides[J].IEEETransactionsonMicrowaveTheoryandTechnique,1997,45(11).(123),,,,,,,,1025mm,,5,,,:[1].[M].:,1995.89.[2],.[M].:,1980.397.521:2©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.