Research Interacted Eddy-Current Transformer Located on Ferromagnetic Material with 'Crack Type' Defects

摘要

The work contains the results of theoretical and experimental research of interaction between a laying-in eddy-current transformer and tested ferromagnetic material with defects of through-the-thickness crack type at variation of the main disturbing factor - variable air-gap fluctuation between the sensor and tested surface. Developed a graphic-analytical simplified model and received equations for engineering calculation of introduced inductances of such eddy-current transformer depending on crack width and air-gap fluctuation size. Received equations for estimation sensitivities of eddy-current transformer to depends on crack width growth and to change of air-gap.