基于DDS技术的模块化多频涡流检测系统设计  

Modular Multi-Frequency Eddy Current Test System Design Based on DDS Technology

作　　者：高军哲[1] 罗飞路[1] 潘孟春[1] 冯婷婷[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《仪表技术与传感器》2009年第10期105-107,共3页Instrument Technique and Sensor

摘　　要：多频涡流检测技术能有效地抑制无损检测过程中的干扰因素,提高检测的分辨率和可靠性。DDS技术是频率合成的新技术,因此,在对多频涡流检测系统进行模块化划分的基础上,设计了基于DDS技术设计信号发生模块,基于VCVS的有源带通滤波模块和模拟正交锁定放大模块等,系统整体具有易于集成和重构的特点。实验结果证明:该系统工作稳定,可用于100 Hz^1 MHz范围内的多频涡流无损检测。Multi-frequency eddy current test technology can eliminate the noise in the NDT process effectively, and improve the resolution and reliability of NDT. DDS was a new technology of frequency synthesizer, so when the multi-frequency eddy current test system was parted modularly, this paper designed the signal source based on DDS technology, the power band pass filter based VCVS and the analogue orthogonal lock-in amplifer. The system was easy to integrate and reconfigurate. The experiments show that this system works well in 100 Hz - 1 MHz range.

关 键 词：直接数字频率合成 多频涡流检测 模块化设计 无损检测 

分 类 号：TG115[金属学及工艺—物理冶金]