浅论网架杆件超声波探伤

(,311200)::;;:TG115.28:A:167124423(2004)04225202GB11345-89,Á42mmÁ180mm,3mm14mm,,,,,,,,,,,,1(a)(b)(a)(b)111.1,1.2A,1%,5%,1.3K2.53,46mm,5MHz,,5mm,,1.4CSK-IC,RBJ-É,,,,1.51.5.1:(),1.5.2:,60mm1.5.3:4dB1.5.4(DAC):CSK-ICÁ3DAC-16dB,DAC-10dB,DAC,,DAC1.6AB,228420048NDTVol.28No.4August.2004©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2.1,(2a)2.2(2b),(Á483.5Á603.5),,(2c)2.3,,,,,,(2d)2.4,,,(2e)2.5,,,,,,(2f)22.6,,,,33.1,()6dB3.2RBJ-É(UF)dB,UFdB3.3JGöT3034.2-19966228©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.