摘要
多频涡流检测技术是一种广泛应用的电磁无损检测技术.在检测过程中,微弱多频涡流信号的分析是检测系统的关键.本文提出了一种基于最小二乘法的涡流检测微弱信号参数分析方法.依据最小二乘法的求解原理,以双频涡流信号分析为例,建立了涡流信号参数分析数学模型,估计出各频率成分的时域特征参数,为涡流检测信号应用提供了依据,并对该算法进行了仿真和检测实验验证.实验结果表明:该方法效果良好,硬件成本低,具有较高的灵敏度,满足多频涡流检测信号参数分析的需要.
Multi-frequency eddy current test is a kind of widely used non-destructive test technique. The analysis of weak signals is a key element in the test system, so this paper proposes an analyzing method based on least squares method （LSM）. Taking the analysis of the dual-frequency eddy current signals for example, the mathematic model is made, and the characteristic parameters of each frequency component are detected for the application of eddy current test signals. Simulation and experiment results show that the method has the advantages of low hardware cost and high sensitivity, and can satisfy the signal analysis need of multi-frequency eddy current test.
出处
《测试技术学报》
2010年第2期140-145,共6页
Journal of Test and Measurement Technology
基金
"十一五"国防预研基金资助项目(51317030106)
关键词
多频涡流检测
最小二乘法
参数检测
信号分析
无损检测
multi-frequency eddy current test
least squares method
parameter detection
signal analysis
non-destructive test
