中文说明：
一个简单的相控阵超声波探伤及成像系统模型。现在可以模拟三种声波束的成像结果，适合理解超声波探伤原理。
English Description：
A simple phased array ultrasonic flaw detection and imaging system model. Now the imaging results of three kinds of acoustic beams can be simulated, which is suitable for understanding the principle of ultrasonic flaw detection