Pulsed eddy current thickness measurement method under large lift based onpower spectral density peak
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摘要: 以脉冲涡流检测信号的功率谱密度峰值作为特征量，并借助COMSOL软件开展了仿真试验，分析了该特征量与管道壁厚、提离值之间的关系；开展了基于该特征量的壁厚反演方法研究，形成了可应用于大提离下铁磁性管道壁厚检测的方法；最后在实验室加工的Q235管道阶梯试件上开展了试验。结果表明，在大提离条件下，壁厚测量误差能控制在±9%以内，且抗干扰能力强，多次测量结果的稳定性好。Abstract: The power spectral density peak of the pulsed eddy current testing signal was used as the feature, and the simulation experiment was carried out with the help of COMSOL software, and the relationship between the feature and the pipeline wall thickness and lift-off was analyzed. After that, the research on the wall thickness inversion method based on this feature was carried out, and a method that can be applied to the wall thickness detection of ferromagnetic pipelines under large lift was formed. Finally, experimental tests were carried out on the Q235 pipeline ladder specimen processed in the laboratory. The experimental results show that under the condition of large lift, the wall thickness detection error can be controlled within ±9%, the anti-interference ability is strong, and the multiple measurement results are stable.
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