摘要
脉冲涡流检测是电涡流检测技术的一个最新研究,激励源采用一定占空比的方波信号.结合虚拟仪器技术,设计了一种USB接口的直接数字合成的脉冲涡流激励源.实验结果表明该激励源有占空比(10%～90%),频率(0.5k～500kHz)连续可调,分辨率高(0.011 6Hz),稳定可靠,界面友好等优点,能够满足脉冲涡流探头驱动要求,具有一定应用前景.
Pulsed eddy current testing is a new research field of eddy current testing technology. A square waveform with adjusting duty is employed as exciting source. Combined with virtual instrument technology, the pulsed eddy current exciting source of direct digital synthesizer is designed based on USB interface. The experimental results indicate that the exciting source has the performance of the continuous adjustable frequency （0.5- 500 kHz） and duty （10 %- 90 %）, high resolution （0. 011 6 Hz）, stability, friendly interface and so on. It is very suitable for the driving requirements of the pulsed eddy current probe, and has some application prospect.
出处
《河南师范大学学报（自然科学版）》
CAS
北大核心
2013年第1期55-60,94,共7页
Journal of Henan Normal University(Natural Science Edition)
基金
国家自然科学基金(61178067)
山西省教改项目(J2012064)
太原科技大学校教改项目(2009SJG213
201129)
关键词
虚拟仪器
脉冲涡流检测
激励源
材料无损检测
virtual instrument
pulsed eddy current testing
exciting source
non-destructive evaluation of material
