METHOD OF NON-DESTRUCTIVE TESTING BASED ON MAGNETIC RESONANCE EFFECT TO DETERMINE PRESENCE OF CONTINUITY DEFECTS AND LOCAL STRUCTURAL HETEROGENEITY IN ROLLED METAL MADE OF FERROMAGNETIC ALLOYS, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01N27/82 

FIELD: non-destructive control.

SUBSTANCE: usage is to determine the presence of continuity defects and local structural heterogeneity in rolled metal made of ferromagnetic alloys. The essence of the invention lies in the fact that the object of control (OC) is affected by a low-frequency magnetizing electromagnetic field with a frequency from 1 to 1000 Hz, while monitoring the amplitude and phase of this field, simultaneously affecting the OC with a high-frequency electromagnetic field with a frequency from 20 to 1000 kHz, then determine the frequency of high-frequency exposure, in which there is the maximum resonance from the cyclic movement of the structure-forming components of the alloy, using at least one sensor tuned to the frequency of the maximum resonant effect, then they act on the OC with a high-frequency electromagnetic field at the frequency of maximum resonance, while ensuring the movement of both sensors and the magnetizing field in two planes along the surface of the OC, process signals from sensors using synchronous detection operating at the frequency of maximum resonant action, signals received after synchronous detection and signals from the sensor location system relative to coordinates OC are processed according to a given algorithm, and the final result is output in the form of signal levels in amplitude and phase with reference to the coordinates of the OC and the parameters of the low-frequency magnetization field.

EFFECT: ensuring the possibility of increasing the sensitivity and reliability of control.

2 cl, 17 dwg