基于部分散射系数矩阵的缺陷识别方法研究

发布时间：2018-04-09 18:13

本文选题：超声　切入点：散射　出处：《声学技术》2017年04期

【摘要】：为了在相控阵超声成像检测时实现缺陷的定性分析,采用部分散射系数矩阵表征传感器采集到的部分散射场信息,并利用部分散射系数矩阵图进行缺陷识别。以相控阵超声全阵列采集获取到的全矩阵数据为基础,结合声波传播过程的衰减性,采用逆向补偿的方法将全矩阵数据补偿到以缺陷为中心的同一圆周上,以此获取缺陷的部分散射信息,并采用部分散射系数矩阵来表征。通过分析缺陷的部分散射系数矩阵图特征,对缺陷进行定性分析和判别。采用此方法对两种典型的缺陷进行仿真实验,结果显示,部分散射系数矩阵图不仅对圆孔和裂纹两类不同缺陷表现出差异性,对同类型不同尺寸和不同角度的裂纹也有明显的不同之处,表明利用该方法可实现缺陷的定性识别。
[Abstract]:In order to realize the qualitative analysis of defects in phased array ultrasonic imaging, the partial scattering coefficient matrix is used to represent the partial scattering field information collected by the sensor, and the partial scattering coefficient matrix graph is used to identify the defects.Based on the full matrix data collected by phased array ultrasonic array and the attenuation of sound wave propagation, the full matrix data is compensated to the same circle with defect as the center by the method of inverse compensation.The partial scattering information of the defect is obtained, and the partial scattering coefficient matrix is used to characterize it.By analyzing the characteristics of partial scattering coefficient matrix of defects, the defects are qualitatively analyzed and identified.This method is used to simulate two typical defects. The results show that the partial scattering coefficient matrix diagram not only shows the difference between the circular hole and the crack, but also shows the difference between the two kinds of defects.The cracks of the same type and different sizes and different angles are obviously different, which indicates that the qualitative identification of defects can be realized by using this method.
【作者单位】：中北大学机械与动力工程学院;中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室;
【基金】：质检公益性行业科研专项(201410026、201510068) 质检总局科技计划项目(2014QK252)资助
【分类号】：TB559

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