任意激励波形的涡流检测系统设计  

Design of Eddy Current Testing System with Arbitrary Excitement Waveform

作　　者：谢宝忠[1] 陈铁群[1] 林俊明[2] 刘桂雄[1] 

机构地区：[1]华南理工大学机械工程学院,广州510640 [2]爱德森(厦门)电子有限公司,厦门361004

出　　处：《无损检测》2007年第4期173-176,192,共5页Nondestructive Testing

基　　金：广东省重点攻关资助项目(2004A11303001;2006B12401001)

摘　　要：为适应当前涡流检测的发展,设计了可激励任意波形的涡流检测系统。采用基于大容量同步动态随机存储器(SDRAM)任意波形表的直接数字合成技术,由CPU根据检测需求生成任意波形幅值表,存储到SDRAM中,现场可编程门阵列器件(FPGA)将波形数据输出到D/A转换器,经滤波、放大后驱动涡流探头。该方法较好地解决了由于受资源限制而在使用直接数字合成输出波形时所进行的各种复杂计算。试验结果表明,任意激励波形的涡流检测系统性能稳定、使用灵活,可以满足高性能涡流检测的需求。A new excitement source of eddy current testing was presented to use an arbitrary waveform as the development of the eddy current testing. A direct digital synthesis （DDS） technology, based on large capacity synchronous dynamic random access memory（SDRAM）, was used, in which the table of arbitrary waveform amplitude generated by CPU according to testing requirement was stored, and FPGA outputs the amplitudes to D/A converter. The output, after being filtered using low pass filter and power amplification, drived the eddy current probe. It was showed that the new method was able to resolve various complicated computations when the resources were limited so as to use DDS, and the presented arbitrary waveform excitement system that was stable and flexible could satisfy eddy current testing requirements at present and in the near future.

关 键 词：涡流检测 任意波形 直接数字合成 激励方式 

分 类 号：TG115.28[金属学及工艺—物理冶金] TJ810.36[金属学及工艺—金属学]