Magnetostrictive transducer and apparatus for measuring an elastic wave using it

摘要

A magnetostrictive transducer generates a torsional wave in a subject (2) having a predetermined section and measures a torsional wave propagating in the subject (2). In the magnetostrictive transducer having a ferromagnetic patch (50) attached to a predetermined position of a subject (2), a cylindrical insulator (4) installed around the periphery of the ferromagnetic patch (50), and a coil (3) wound around the cylindrical surface of the insulator (4), a torsional wave is generated based on a magnetostrictive effect to then be induced to the subject (2) when current is applied to the coil (3). The ferromagnetic patch (50) includes a strip unit (51) attached to the subject (2) in an inclined manner with respect to an axial direction of the subject (2) and transferring the torsional wave to the subject (2); and tail units (52,53) formed at opposite ends of the strip unit (51) and concentrating a magnetic flux on the strip unit (51) when current is applied to the coil (3).