METHOD OF METALLIC NON-MAGNETIC TUBES WALL THICKNESS EDDY CURRENT CONTROL Russian patent published in 2018 - IPC G01N27/90 

FIELD: measuring equipment.

SUBSTANCE: invention relates to methods of non-magnetic metallic products non-destructive testing and can be used to control the thickness of a metal product and the thickness of the dielectric coating of its surface. Essence of the claimed invention lies in the fact that the method of eddy current monitoring of the wall thickness of metallic non-magnetic pipes comprises a stage, on which the wall thickness is determined on the basis of the experimental functional dependence of the phase of the introduced voltage of the third frequency on the gap value and the wall thickness for a fixed value of the specific electric conductivity of the pipe wall metal, corresponding to the used for finding the functional dependence of the pipe samples, and for determining the wall thickness, the measured value of the phase of the introduced voltage of the third frequency is corrected by the amount of the correction proportional to the difference between the measured value of the phase of the introduced voltage of the second frequency and its value for the samples used to determine the functional dependence of the phase of the introduced voltage of the third frequency on the gap value and the wall thickness.

EFFECT: technical result is an increase in the reliability of control over the thickness of the pipes and simplification of the determination of the function of converting the values of the introduced voltages of the eddy current converter into the value of the controlled parameter.

1 cl, 5 dwg