Couple of circumbient coils for checking through foucault currents of treatments in limbs of longitudinal parts of reduced section. (Machine-translation by Google Translate, not legally binding)

摘要

Pair of surrounding coils for the verification by foucault currents of thermal treatments in extremities of longitudinal pieces of reduced section, characterized in that each one of them involves primary winding and two secondary windings, in a symmetrically antagonistic arrangement, with which a system is achieved double differential, whereby foucault currents are created, respectively, in a standard piece and each one of the tests, achieving a distribution of magnetic fields that, producing inside the test coil a virtual electromagnetic stop, coinciding with the optimal position of each piece, assumes that, from said position, any variation in the direction of translation to the inside of the coil does not cause any increase in the indication and, consequently, allows the immediate separation of the correct parts and the defective (Machine-translation by Google Translate, not legally binding)