基于DDS技术的脉冲涡流检测系统  

Pulsed Eddy Current Detecting System Based on DDS

作　　者：宋琦华[1] 毛义梅[1] 雷华明[1] 

机构地区：[1]上海交通大学仪器科学与工程系,上海200240

出　　处：《计算机测量与控制》2011年第8期1817-1820,共4页Computer Measurement &Control

摘　　要：脉冲涡流检测技术作为当前无损检测技术中的一种新技术,能够快速方便地检测金属构件中的缺陷;文中根据脉冲涡流检测信号源的特点,采用Direct Digital Frequency Synthesis(直接数字频率合成,简称DDS)技术,设计了一种参数可调式脉冲波形信号源的脉冲涡流检测系统;系统由脉冲涡流检测硬件电路、上位机、数据采集卡和相关软件组成;最后使用AD9850芯片产生1kHz、50%占空比的方波激励对标准缺陷试件进行实验,并提取特征值对试件的三种定量缺陷区分进行了研究。The pulsed eddy current detecting technology is a new branch of the eddy current nondestructive testing and can detect the defects in the metal conductor equipments quickly and easily. Based on the characteristics of the pulsed signal generator, a pulsed eddy current detecting system with parameters adjustable pulsed signal generator, using direct frequency synthesis technology, was designed. The PEC testing system is combined of hardware circuit, PC, data acquisition card and relevant software components. With AD9850, a square wave of lkHz is generated as excitation of defect detection experiment from which eigenvalues are calculated and identification of three quantitative PEC defects were discussed.

关 键 词：脉冲涡流检测 DDS 缺陷分类 

分 类 号：TG115.28[金属学及工艺—物理冶金]