Seoul National University

Seung-Hyun Cho

Yoon-young Kim

Chan-Il Park

Woo-Chul Kim

Ik-Kyu Kim

A method and apparatus for generating and measuring a torsional wave in a rod, shaft or pipe using magnetostriction are provided. The magnetostrictive transducer includes at least one strip attached to a predetermined position of a rod member, an insulator disposed around the strip, a coil wound around the insulator, and magnets providing a bias magnetic field to the strip, wherein a plurality of strips are attached to the rod member at predetermined intervals in a circumferential direction, and one pole of the magnet is close to an end of a first strip among the plurality of strips, and another pole of the magnet is close to an end of a second strip among the plurality of strips.

Method of generating and measuring torsional waves in cylindrical structure using magnetostrictive effect, and magnetostrictive transducer and structure diagnosis apparatus using the method

A magnetostrictive transducer generating a torsional wave in a subject having a predetermined section and measuring a torsional wave propagating in the subject. In the magnetostrictive transducer having a ferromagnetic patch attached to a predetermined position of a subject, a cylindrical insulator installed around the periphery of the ferromagnetic patch, and a coil wound around the cylindrical surface of the insulator, a torsional wave is generated based on a magnetostrictive effect to then be induced to the subject when current is applied to the coil. The ferromagnetic patch includes a strip unit attached to the subject in an inclined manner with respect to an axial direction of the subject and transferring the torsional wave to the subject; and tail units formed at opposite ends of the strip unit and concentrating a magnetic flux on the strip unit when current is applied to the coil.

Growing community of inventors

Ansan-si, South Korea

Seung-Hyun Cho