Patent ID: 6924642

Claim:
Magnetostrictive transducer comprising: a patch having predetermined thickness, the patch being made of ferromagnetic material; and. a magnetic field generator for generating magnetic field applied to the patch, the magnetic field generator being placed above the patch, wherein the magnetic field generator comprises: a main body made of non-magnetic material; two magnets for generating bias magnetic field applied to the patch, the magnets being located in upper part of the main body, the magnets being apart from each other; and a coil for winding around the magnets, and wherein, as an alternating current is supplied to the coil, additional magnetic field applied to the patch is generated, and the bias magnetic field and the additional magnetic field are parallel to the patch, and wherein, as an alternating current is supplied to the coil, the patch generates Lamb waves in direction of the magnetic field and shear horizontal (SH) waves in direction forming predetermined angle with the direction of the magnetic field.