Application of Magnetostrictive Transducer for the Long-Range Guided Wave Inspection
The leakage of the pipes is a major issue for the safety of industrial structures. However, in many cases, because of their geometrical complexity and inaccessibility, it is difficult to inspect them by the conventional NDE method. A long-range guided wave inspection, thus, is an option to inspect them. A torsional vibration mode, T(0,1) shows many advantages in a long-range guided wave examination of a pipe, such as no dispersion characteristic, no radial displacement and low attenuation. However, it is not easy to fabricate a transducer with an array of piezoelectric elements for generation of torsional vibration mode and even expensive. Recently a magnetostrictive metal strip sensor was used for a generation of the torsional vibration modes in a pipe and this technique has shown several advantages for practical applications. This study investigated the applicability of a long-rang guided ultrasonic method to the detection of artificial notches even in the presence of various foreign objects.
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
Y. M. Cheong et al., "Application of Magnetostrictive Transducer for the Long-Range Guided Wave Inspection", Key Engineering Materials, Vols. 345-346, pp. 1295-1298, 2007