为提升声波探伤实验装置的测量精度和可操作性，本文基于脉冲反射法中缺陷回波法的原理和方波调制波的理念，结合PicoScope 6000E系列示波器、超声波探伤用固定装置、探头等，搭建了一套半自动化声波探伤系统. 该系统通过振幅键控法生成方波调制波，经示波器接收并分析回波信号，再由 Matlab完成小波降噪和B-scan分析，即可确定缺陷深度和具体位置. 实验结果显示，10mm深平面缺陷的深度相对误差不超过2.02%；13.5mm深圆孔缺陷的深度相对误差不超过1.53%；10mm深2mm宽平面缺陷的位置相对误差不超过1.49%. 改进后的装置有效提高了测量精度和可操作性. 

To enhance the measurement accuracy and operability of the ultrasonic flaw detection experimental device，the flaw echo method in the pulse reflection technique and the concept of square-wave modulation waves are used. A semi-automated ultrasonic flaw detection system is built by integrating a PicoScope 6000E series oscilloscope, a fixed device for ultrasonic flaw detection, probes, etc. This system generates square-wave modulation waves through amplitude keying method. The oscilloscope then receives and analyzes the echo signals. Subsequently, Matlab performs wavelet denoising and B-scan analysis to determine the depth and specific position of the defect. The experimental results show that the relative depth error of a 10mm deep planar defect does not exceed 2.02%; The relative depth error of a 13.5mm deep circular hole defect is within 1.53%; The relative position error of a 10mm deep and 2mm wide plane defect is less than 1.49%. The improved device effectively enhances measurement accuracy and operability.