EDDY CURRENT MAGNETIC METHOD OF FAILURE DETECTION OF FERROUS OBJECTS Russian patent published in 2013 - IPC G01N27/90 G01N27/82 

FIELD: test engineering.

SUBSTANCE: controlled object is magnetised with permanent magnetic field, the eddy current is excited by the eddy-current converter on the controlled area, the voltage $${\underset{\_}{U}}_{br}$$ brought into the eddy-current converter is recorded, and according to it, it can be judged about the presence of defects, characterised in that, by changing the parameter P regulating the influence of the constant magnetic field on the controlled object, the constant magnetic field intensity H is gradually changed from minimal value to maximum, the maximum of the U_MAX amplitude of the voltage $${\underset{\_}{U}}_{br}$$ brought into the eddy-current converter and the value of the parameter P corresponding to it are recorded, and the parameters of the defect are evaluated by a set of values U_MAX and P.

EFFECT: increased sensitivity and informativity of the control.

3 cl, 3 dwg