电工技术学报2012，Vol.27Issue(6)：6-11,6.
基于DDS技术的电磁声发射涡流加载电源
Power Source of Electromagnetically Induced Acoustic Emission Based on DDS
摘要
Abstract
Electromagnetically induced acoustic emission （ISMAIS） tecnnology lS a new type of nondestructive test （NDT） techniques, which does nondestructive detection with the effect of dynamic electromagnetic loading to generate a stress field stimulating stress waves from the defects. The traditional EMAE uses the direct loading to introduce the electromagnetic stimulation. But the direct loading method is not convenient and needs very technique of AE induced by eddy current high current to stimulate acoustic emission （AE）. The introduces the electromagnetic stimulation by an electromagnetic coil. The defect itself can generate acoustic emission signals, which could be used to boost the detection ability of small cracks in the thin-walled metallic structures. In order to satisfy the requirement of EMAE testing, such as high power output, pulse counts adjusting and the frequency of the output in wide range, a new power source based on direct digital synthesis （DDS） was designed. The power source included signal generating, power amplifying and series resonance, which the control circuit was the core part. Experiments＇ results show that the system can satisfy requirement of the EMAE testing with the merits of outstanding stability and flexible parameter adjustment.关键词
直接数字频率合成/电磁声发射/涡流激励/无损检测Key words
Direct digital synthesis(DDS)/electromagnetically induced acoustic emission (EMAE)/eddy current exciting/nondestructive test (NDT)分类
信息技术与安全科学引用本文复制引用
刘素贞,李文杰,金亮,张闯,杨庆新..基于DDS技术的电磁声发射涡流加载电源[J].电工技术学报,2012,27(6):6-11,6.基金项目
国家自然科学基金 （）
河北省自然科学基金（E2012202026、E2012202048）资助项目 （）
