基于超声衰减谱的金属材料无损辨识

摘要

Six kinds of metal materials with different ingredients are taken for example to study.The time domain ultrasonic backscattered signalsf(t)within the material are obtained and all of them are divided into two equivalent parts f1 (t)and f2 (t),and then analyzed with FFT,finally the attenuation spectrums F(ω)of material are calculated.The experiments show that the calculation by using of attenuation spectrums correlation coefficient (the correlation coefficient between the attenuation spectrums Fa (ω)and Fb (ω)of two kinds of material)can be used for nondestructive identification of metal materials.%分别以六种不同成份的金属材料为例，获取材料内部一段时域的超声背向散射信号f(t)后，两等份为f1(t)和f2(t)，再通过快速傅里叶变换，计算出材料的衰减谱F(ω)。结果表明：利用衰减谱相关系数(两种材料的衰减谱Fa (ω)与Fb (ω)的相关系数)的计算可以对原始材料进行辨识。