用数字化超声检测系统对缺陷回波进行了分析,提取了回波信号的特征参数,用统计分析方法研究了特片值的有效性,在此基础上进行了缺陷的判别与分类。 Defect echo was analyzed by digital ultrasonic testing system, the characteristic parameters of echo signal were extracted, the validity of special value was studied by statistical analysis method, and then the discrimination and classification of defects were carried out.