超声相控阵缺陷检测聚焦技术仿真分析

采用有限元方法对超声相控阵缺陷检测技术进行分析.首先介绍了超声波波束聚焦、偏转的基本原理,然后使用COMSOL有限元分析软件以及Matlab仿真程序对超声相控阵缺陷检测技术进行建模,在该模型的基础上分析了超声相控阵延时聚焦技术的实现过程与方法.在仿真过程中,通过改变阵元参数,研究其对于超声相控阵缺陷检测信号的影响,并结合物理实验进行了验证.分析结果表明,超声相控阵的延时聚焦技术减小了发射波的波幅宽度,提高了缺陷点回波信号的幅值;基于延时聚焦技术的发射信号,其波束指向性图的主波瓣波束较窄,幅值较高,旁瓣幅值降低,提高了图像分辨率以及成像质量.

Simulation on Focusing Technology of Ultrasonic Phased Array for Defect Detection

Finite element method is used to analyze the ultrasonic phased array technology for defect detection.Firstly,the basic principles of ultrasonic beam focusing and deflection are introduced.Then,the model of ultrasonic phased array defect detection is derived by using COMSOL software and Matlab simulation program.The implementation process and method of focusing time delay technology of ultrasonic phased array are analyzed based on FEM model.Moreover,the effects of array element parameters on ultrasonic phased array detection signal are studied,and the experiments verify the simulation result.The simulation and experimental results show that focusing time delay technology of ultrasonic phased array can reduce the width of the transmitted signal and increase the amplitude of defect echo signals,the transmitting signals based on the focusing time delay have narrow main lobe beam and high amplitude,it can reduce the amplitude of side lobe and improve the image resolution.