超声相控阵距离幅度曲线计算方法  

Theoretical calculation on distance amplitude curve of ultrasonic phased array

作　　者：赵新玉[1] 陈婧阳 段晓敏[2] ZHAO Xinyu;CHEN Jingyang;DUAN Xiaomin(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028;School of Science,Dalian Jiaotong University,Dalian 116028)

机构地区：[1]大连交通大学材料科学与工程学院,大连116028 [2]大连交通大学理学院,大连116028

出　　处：《声学学报》2021年第3期456-462,共7页Acta Acustica

基　　金：国家重点研发计划项目(2016YFF0203000)资助。

摘　　要：超声相控阵偏转聚焦声场能量分布不均匀,造成不同位置的缺陷回波幅度差异,针对该缺陷量化问题,提出超声相控阵系统距离幅度曲线理论计算方法。在非近轴近似声场模型的基础上,结合缺陷散射模型来建立相控阵系统测量模型,再利用该方法来预测不同位置横通孔缺陷的回波信号,进而获得信号幅度随位置的变化曲线。分析对比了不同偏转聚焦声束理论计算结果与实验测量结果,两者幅度在焦点附近具有较好的一致性,偏差在5%以内,验证了超声测量模型计算方法的有效性。The sound fields of the focusing and steering beam radiating from the phased arrays are nonuniform according to different spatial positions,so that the echo signals of same size defects will be changed with positions.To analyze defects quantitatively,a model-based distance amplitude correction is proposed for the phased array system.Based on non-paraxial multi-Gaussian beam model and flaw scattering model,ultrasonic measurement model for the phased array system is proposed to calculate the echo signals from side-drilled holes at different positions.Furthermore,the modelbased distance amplitude curves are compared with traditional experimental results in the case of different focusing and steering beam.It is shown that two methods have a good agreement.The deviation are within 5%.

关 键 词：相控阵 测量模型 聚焦声场 模型方法 定量检测 缺陷回波 回波信号 曲线计算 

分 类 号：TB559[理学—物理]