If next to the object of a ferromagnetic material to create an alternating magnetic field inside the material object induced eddy currents. The eddy currents also produce a magnetic field that counteracts the external magnetic influences. The parameters of the secondary magnetic field are fixed. If there is an object within the material imperfections (such as cracks, cavities, and other defects), it will affect the eddy current configuration, and, consequently, the parameters of the magnetic field created by them. Fixing these changes, you can get information about the internal defects of the object.
More interesting: http://i-engineering.hk/
Industrial Engineering defectoscope:
Descrydefect SD 340b includes a sensor system for controlling the longitudinal and transverse surface defects. Installation does not detect internal defects.This model is equipped with the latest spectrometer for precise analysis, rapid identification and sorting of samples.

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