ELECTROMAGNETIC ACOUSTIC TRANSDUCER EQUIPPED WITH ORBITING COIL

摘要

PURPOSE: An electromagnetic ultrasonic sensor with an orbit-moving coil is provided to prevent damage to a PCB(Printed Circuit Board) coil by heat of a metal material by successively heating and cooling a plurality of coils regardless of a kind and the temperature of the metal material. CONSTITUTION: An electromagnetic ultrasonic sensor with an orbit-moving coil comprises a magnetic field generating part(2), a pair of roller units(23a,23b), a belt unit(22), and a coil unit(21). The magnetic field generating part is arranged separately from the surface of a metal material. The roller units are arranged in both sides of the magnetic field generating part and spaced from the surface of the metal material. The belt unit winds the pair of roller units by a caterpillar form and rotates by the rotation of the roller units. The coil unit is arranged on the surface of the belt unit.