超声检测中的兰姆波层析成像-声学技术.PDF

23 3 Vol. 23, No. 3 2004 9 Technical Acoustics Sept. , 2004 张海燕, 吕东辉, 袁瀚贝 ( , 200072) : , , : , : ; ; : TB559 : A : 0003630(2004) 030 3803 Lamb wave tomography in ultrasonic testing ZHANG Haiyan, LDonghui, YUAN Hanbei (School of Communication and Inf ormation Engineering , Shanghai University, Shanghai 200072, China) Abstract: As ultrasonic guided waves, Lamb waves allow large sections of thin sheet structures to be rapidly inspected. However, extraction of quantitative information from Lambwave data requires welltrained personnel with datailed knowledge of mechanical waveguide physics. Simulation of tomographic image reconstruction of different defects in thin aluminum using Lamb waves is described in this paper. The tomographic images ob tained by using a filtered back projection algorithm can provide information concerning the location and nature of the defects, which can be interpreted by a technician. Key words: Lamb waves; tomography; nondestructive testing Lamb Wave Tomography LWT 0 , : [ 7] 993 , Hutchins ( computed tomography, , CT) , [8] 994 , Jansen 70 CT , LWT , , , CT , , , ( FBP) [9]