Annular Eddy Current Array Method for Detecting Capillary Pressure Pipe Corrosion and Crack Defects: COSMOL-based Simulation, Array Probe Optimization, and Experimental Verification

This study proposed an annular eddy current array detection method to satisfy high-precision and high-efficiency requirements on capillary pressure pipe defects. First, using COSMOL software, the annular eddy current array detection model of capillary pressure pipe defects was developed and realized, optimizing the array probe key parameters. Next, the corrosion defects on the inner and outer walls and the crack defects on the capillary pressure pipe were detected with the optimized probe, with signal features of different types of defects compared and analized in detail. Finally, the probe prototype and the related test system were developed based on the optimized theoretical model, and crack and corrosion defects on the capillary pressure pipe were detected and identified. The experimental results proved that the proposed annular eddy current array detection method effectively detected cracks on the inner and outer walls and corrosion defects along the capillary pressure pipe. The present research results show favorable application prospects for thin-wall capillary pressure pipes in the defect detection field.