基于多晶材料超声背向散射信号时频域特征的识别方法  

Identification method based on time and frequency domain features of ultrasonic backscattering signals of polycrystalline materials

作　　者：刘昱 贺西平[1] 贺升平 周越 王杰 LIU Yu;HE Xiping;HE Shengping;ZHOU Yue;WANG Jie(Shaanxi Key Laboratory of Ultrasonic,College of Physics and Information Technology,Shaanxi Normal University,Xi′an 710119,China;Luzhou High-tech Research Institute,Luzhou 646000,China)

机构地区：[1]陕西师范大学物理学与信息技术学院陕西省超声重点实验室,西安710000 [2]泸州高新技术研究所,泸州646000

出　　处：《无损检测》2023年第6期12-16,共5页Nondestructive Testing

基　　金：装备预研共用技术项目(XXXXX040302);国家自然科学基金项目(12174241)。

摘　　要：利用多晶材料微结构差异对超声波传播的影响特性,提出了一种计算超声回波信号特征量的算法,根据拉依达准则设定了识别阈值并编译了识别程序。采用所提方法对金属材料和陶瓷材料样品进行超声检测试验。试验结果表明,该方法可对材料和尺寸完全一致的样品实现准确识别。An algorithm for calculating the features of ultrasonic echo signals was proposed based on the influence characteristic of the microstructure difference of polycrystalline materials on ultrasonic waves.The recognition threshold was determined according to the Pauta criterion and the identification algorithm was compiled as an application program.The ultrasonic identification experiments were carried on the samples of metal materials and ceramic materials.The results showed the objects with the same materials and sizes can be identified accurately.

关 键 词：超声识别 超声背向散射 晶粒尺寸 拉依达准则 

分 类 号：TG115.28[金属学及工艺—物理冶金]