Electromagnetic non-destructive quality detection method and detection circuit and system therefor

摘要

The present invention discloses an electromagnetic non-destructive quality detection method and detection circuit and system thereof. By alternately performing a DC excitation response and a zero input response to the primary RL circuit, the magnetic field strength of the DC magnetic field generated by the inductance element magnetizing coil alternately changes according to the change in the current magnitude, and the detection target is set to the corresponding magnetic field. After being placed in a DC magnetic field of alternating intensity, the detection target is magnetized and at the same time causing a change in magnetic field inductance. By detecting the inductance of the magnetizing coil and determining whether the electromagnetic characteristics of the detection target have changed, it is possible to determine whether there are quality defects such as uniformity of the steel wire and the breakage of the steel wire. Alternatively, by detecting the inductance of the magnetizing coil, characteristics such as a cross-sectional area related to a detection target and inductance characteristics or a thickness of a zinc layer may be analyzed. The present invention is suitable for detection of electromagnetic sensitive detection objects or product performance calibration in real time, online, continuously and automatically, to find quality problems in a timely manner, reduce the defective product rate and improve product quality performance.