FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment and can be used for monitoring of microstructure of metal target. Embodiments of present invention provide electromagnetic sensor (400) for detecting a microstructure of a metal target, comprising magnetic device (410, 420) for providing an excitation magnetic field; magnetometer (430) for detecting a resultant magnetic field induced in a metal target; and a calibration circuit (450) for generating a calibration magnetic field for calibrating electromagnetic sensor. Calibration magnetic field is generated by an electrical current induced in calibration circuit by excitation magnetic field.
EFFECT: technical result is increased sensitivity of sensor due to elimination of distortion of its readings caused by interference of various nature.
26 cl, 10 dwg
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