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1 Metrology and Measurement Systems

1 2025

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Detection of steel pipeline without removing cladding based on differential compensation probe

Wang Xinhua, Guo Zisheng, Sun Tao, Hu Naixiang, Gao Peng, Yang Lin, Rasool Ghulam, Qi Yongsheng

Metrology and Measurement Systems

2025

Vol. 32, nr 1

1--21

The harmonic magnetic field detection method has the advantage of a large lifting height, which is particularly beneficial for the detection of steel pipelines without removing cladding. However, it has the problem of strong coupling between the excited and induced magnetic field signal, which limits its detection accuracy. In this work, we propose a differential compensation probe, which can effectively suppress the excitation magnetic field signal in the detection signal, in order to significantly improve the accuracy of the harmonic magnetic field detection method. The defect detection capability of the probe is verified both by the finite element simulations and experiments. Despite its simple structure, the differential compensation probe greatly improves the signal-to-noise ratio of the detection signal. It is expected that the detection method based on the differential compensation probe will have a broad application prospect in the detection of pressure pipelines and vessels with cladding layers.