基于频率扫描技术的裂纹深度检测方法研究  

Research of crack depth detection method based on frequency scanning technique

作　　者：陈棣湘[1] 潘孟春[1] 罗飞路[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,长沙410073

出　　处：《仪器仪表学报》2007年第S1期12-14,共3页Chinese Journal of Scientific Instrument

摘　　要：本文在介绍了几种常用的裂纹深度检测方法的基础上,将频率扫描技术应用到交变磁场测量中,以垂直工件表面的磁场强度与总磁场强度的比值作为特征值,实现对缺陷深度的检测。本文分析了激励信号频率对裂纹深度检测的影响,在频率扫描过程中发现特征值开始时随扫描频率的增大而减小,然后又随扫描频率的增大而增大。将特征值最小时的扫描频率命名为拐点频率,在此基础上建立了基于频率扫描技术的裂纹深度检测模型,同时还对拐点频率与裂纹深度的定量关系进行了分析。实验结果证明,该方法可以很好地实现对裂纹深度的检测。After introducing some familiar methods of crack depth detection,frequency scanning technique was applied to alternative current field measurement.The ratio of the upright magnetic intensity divided by total magnetic intensity was used as a characteristic value to achieve crack depth detection.The influence of encouraging frequency to crack depth detection is analyzed and the rule of characteristic value varying with scanning frequency was observed.It was found that at first when encouraging frequency incre...

关 键 词：交变磁场测量 裂纹深度 无损检测 频率扫描技术 

分 类 号：TH878.3[机械工程—仪器科学与技术]