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<p>The alternating current field measurement (ACFM) technique is an advanced nondestructive testing method that effectively identifies defects in metal materials, including cracks, corrosion, and other structural damages. Consequently, ACFM technology has a wide range of potential applications in the inspection of subsea steel structures used in offshore oil and gas exploration, offshore wind power generation, and marine aquaculture. To improve the accuracy of underwater ACFM non-destructive testing, this paper designs a specialized underwater ACFM probe based on the principles of electromagnetic induction and the skin effect. COMSOL software is used to establish an inspection model in a seawater environment, and multiple sets of simulation analyses with different materials and parameters are conducted to determine the optimal material and parameter settings for the system probe. Additionally, experimental studies were carried out on Q235 steel to evaluate crack conditions of varying depths and lengths. The experimental results show that the detection error is 8.53 % for cracks of different lengths, and 13.897 % for cracks of different depths. These results verify the effectiveness and accuracy of the designed probe in practical applications.</p>

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Design and experimental study of probe for underwater crack detection system based on alternating current field measurement

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Hui Gao,
  • JiaJun Qu,
  • Qing Lu,
  • JinCai Chen,
  • Yu Lu

摘要

The alternating current field measurement (ACFM) technique is an advanced nondestructive testing method that effectively identifies defects in metal materials, including cracks, corrosion, and other structural damages. Consequently, ACFM technology has a wide range of potential applications in the inspection of subsea steel structures used in offshore oil and gas exploration, offshore wind power generation, and marine aquaculture. To improve the accuracy of underwater ACFM non-destructive testing, this paper designs a specialized underwater ACFM probe based on the principles of electromagnetic induction and the skin effect. COMSOL software is used to establish an inspection model in a seawater environment, and multiple sets of simulation analyses with different materials and parameters are conducted to determine the optimal material and parameter settings for the system probe. Additionally, experimental studies were carried out on Q235 steel to evaluate crack conditions of varying depths and lengths. The experimental results show that the detection error is 8.53 % for cracks of different lengths, and 13.897 % for cracks of different depths. These results verify the effectiveness and accuracy of the designed probe in practical applications.