3Liu Zhenqing, Wei Moan. Fuzzy detection for ultrasonic flaw in section of highly scattering materials Chinese Journal of Acoustics[J]. NDTIEInternational, 1997, 17(6): 40-41.
4Dai Guang, Xu Yan Ting, Wang Ya Li, et al. AE monitoring and data analysis for large spherical tank[J]. NDTIEIntemational, 1993, 26(6): 287--290.
5Liu ZQ, Lu WeiMA. Structures noise reduction of ultrasonic signals using artificial neural network adaptive filtering Ultrasonics[J]. Proc of 8th APCNDT Shanghai, 1997, 1(1).. 5-6.
6Silk M G. Sizeing like defects by ultrasonic means. Research Techniques in Non-destructive Testing[M]. London: Academic Press, 1977, 3-4.
7Mauric Silk. Guide to Calibration and Setting-up of the Ultrasonic Time of Flight Diffraction(TOFD) Techinque For Defect Detection[M]. London: Academic Press, 1993, 46.
