METHOD FOR CONTROLLING MECHANICAL STRESSES OF RAIL BARS IN PRESENCE OF MAGNETIC AND TEMPERATURE FIELDS BY BARKHAUSEN NOISE METHOD AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC B61K9/08 E01B35/00 

FIELD: measuring equipment.

SUBSTANCE: according to the method for controlling mechanical stresses of rail bars in the presence of magnetic and temperature fields by the Barkhausen noise method (BN), the obtained data is visualised in the form of an amplitude graph of the harmonic envelopes of the BN spectrum. By the presence of deviations of the repetition interval of the harmonic envelopes of the BN spectrum, the presence of the material magnetization in the application area of an attachable sensor for BN recording is determined. The detected magnetization of the material is compensated by creating magnetic field of opposite direction in the measurement area, for which a direct bias current is applied to the excitation coil, reaching the predetermined repetition interval of the harmonic envelopes of the BN spectrum. The evaluation of the level of mechanical stresses is carried out when a predetermined repetition interval of the harmonic envelopes of the BN spectrum is reached, taking into account the temperature of the control object. A device for implementing the mentioned method is also disclosed.

EFFECT: increased reliability of control results, which allows to improve the safety of railway traffic.

2 cl, 4 dwg