利用双谱恢复漏磁检测中的缺陷信号

The Reconstruction of Defect Magnetic Flux Leakage Signal by Using Bispectrum

在对铁磁材料的漏磁无损检测中,缺陷信号经常受到噪声的干扰,从而影响设备的检测能力以及对缺陷的评估。通过基于双谱信号重构方法,在含有不同噪声的检测信号中分别提取了缺陷信号的相位和幅值,实现了缺陷信号的恢复,并用实测数据对此方法进行了验证。从有多种噪声的漏磁检测信号中恢复缺陷信号为实现漏磁场的定量分析打下基础。

In magnetic flux leakage （MFL） nondestructive testing of ferromagnetic materials, detection of defects is often disturbed by noise. The noise in MFL signal can considerably reduce the detect ability of defect signals in MFL data and influences the evaluation of defects. The phase and magnitude of defect signal were extracted based on the method of bispectrum signal reconstruction and realized the defect signal reconstruction in actual measurement data. It is the foundation of the research on the quantitative analysis of MFL signal.