A small-diameter tube weld crack alternating-current electromagnetic field detection method based on gyromagnetic focusing excitation and phase enhancement
By employing a method of gyromagnetic focusing excitation and phase enhancement, utilizing a conical gyromagnetic focusing excitation coil and a TMR sensor array, combined with a phase-amplitude joint enhancement algorithm and a geometric template compensation method, the problem of insufficient sensitivity and signal stability in the detection of small-diameter pipe welds in existing technologies is solved, achieving efficient and reliable identification of minute defects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA YANGTZE POWER
- Filing Date
- 2026-05-20
- Publication Date
- 2026-07-17
AI Technical Summary
Existing AC electromagnetic field detection technology has insufficient sensitivity and limited signal resolution in the inspection of welds in austenitic stainless steel small-diameter pipes. It is also significantly affected by external interference, making it difficult to effectively identify minute defects, resulting in unclear detection response and insufficient signal stability and accuracy.
A method combining gyromagnetic focusing excitation and phase enhancement is adopted. An axial focusing magnetic field is generated by a conical gyromagnetic focusing excitation coil, and the magnetic field components are collected by a TMR sensor array. The phase-amplitude joint enhancement algorithm and geometric template compensation method are used to achieve efficient detection of weld cracks.
It significantly improves the sensitivity and reliability of weld inspection for small-diameter pipes, enhances adaptability to environmental noise, improves the authenticity and repeatability of inspection results, and can effectively identify minute defects.
Smart Images
Figure CN122409818A_ABST