Development of Surface Cracks Detection Method and System based on ACFM Technology
It was designed and developed that a real-time and high-precision ACFM crack detection method and system.By scanning the induced electromagnetic field generated by the welding seam of the pressure-bearing equipment or the base material after excitation,the rotating magnetic field distortion signal was obtained at the crack and other defects,and the ro-tating magnetic field distortion signal was identified,collected and processed in real time and the corresponding information was extracted.The rotating magnetic field distortion signal was digitized,so as to realize the real-time detection of the sur-face crack of the pressure-bearing equipment.This method could effectively compensate the error caused by the diffusion effect of the rotating magnetic field distortion signal,and amplify and filter the rotating magnetic field distortion signal to compensate the signal strength and improve the sensitivity of crack detection.The method had the advantages of non-contact detection,quantification and location of cracks detection,low detection requirements and no special treatment of the detec-tion surface.It provided an innovative nondestructive testing method.
ACFMcracksrotating magnetic field distortion signalsdetection systempressure-bearing equipmentnondestructive testing
NETL
NSTL
万方数据
维普
