水平连铸圆钢超声检测结果的信号处理

水平连铸圆钢为多晶种的不均匀粗晶材料，当采用超声波对其进行检测时，将产生较强的组织散射噪声，从而使得对缺陷回波的判断与评价无法进行本文采用分离频谱的方法对原始检测信号进行处理，再用截止地对缺陷回波进行恢复运算。实验结果本文所采用的方法能较为有效地消除原始检测信号中的组织噪声，从而提高超声检测的信噪比。

Signal processing of the ultrasonic testing results on HCC round steel billets

Horizontally-Continuously-Cast (HCC) round steel billet is a kind of coarse grained material with multicrystals and inhomogeneity.Strong structure-scattered noise will occur when it is tested with ultrasonic waves; this fact makes it impossible to evaluate the flaw echoes. In this paper, the Split-Spectrum technique together with a Cut-Off Frequency algorithm is employed to process the original testing signals and to extract the flaw echoes. Experimental results show that the technique employed can eliminate the structural noise efficiently and hence enhance the signal-to-noise ratio of the ultrasonic testing.