分离谱法在超声信号处理中的应用

Split - spectrum Processing Technique for Ultrasonic Signal Analysis

在超声无损检测中,由于某些特殊材料(如离心铸造的不锈钢、碳纤维复合材料等)组织结构比较复杂, 所得到的超声回波信号会受到较强的结构噪声干扰,信噪比较低,严重影响了缺陷信号的识别。结合相关课题讨论了 分离谱法在消除结构噪声方面的应用,实验结果表明,该方法可以得到良好的滤波效果。

Ultrasonic nondestructive testing of large grained materials is limited by the ability of the detection process to distinguish the flaw signals from the backscattered grain noise. This noise often masks the flaw signal, leading to difficulties in its detection and identification . In this paper, split - spectrum processing technique is introduced. Ultrasonic flaw detection experiments are presented to demonstrate the performance of this technique.