介绍了微电脑车轴超声波探伤仪的工作原理。给出了超声波发射电路、超声波接收放大电路、衰减量显示电路、AD9850和AD603芯片的基本工作原理及应用。该超声探伤仪引入了直接数字合成技术,可以使超声回波图更清晰、更准确,具有集成度高、响应速度快、探测精度高、分辨率高,图象清晰等特点。高速数据采集和现场可编程门阵列技术的运用解决了以前超声波设备采样频率与计算机通信的瓶颈,可以提高测量精度,在不退轮的情况下能够准确判断车轴的缺陷,减少误判和漏判的概率。
【英文摘要】 This paper mainly introduces the theory of ultrasonic inspection system,including the ultrasonic transmitting circuit, the receiving circuit and the display circuit, especially the theory of AD603 and AD9850 in detail.This new type ultrasonic flaw detector is said to have high integrated circuit, rapid speed, high resolution ratio and clear image.
