Long-range guided wave inspection of pipe using magnetostrictive sensor technology: the feasibility of defect characterization

Hegeon Kwun; Chris P. Dynes

doi:10.1117/12.302530

15 March 1998 Long-range guided wave inspection of pipe using magnetostrictive sensor technology: the feasibility of defect characterization

Hegeon Kwun, Chris P. Dynes

Author Affiliations +

Proceedings Volume 3398, Nondestructive Evaluation of Utilities and Pipelines II; (1998) https://doi.org/10.1117/12.302530
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

Abstract

The feasibility of characterizing a defect in pipe from the defect signal detected by using the magnetostrictive sensor (MsS) technique, which utilizes longitudinal guided waves for long-range inspection of pipe, was investigated. Signals from notches of various cross-sectional areas showed that the reflection coefficient of the wave from these planar defects is insensitive to the wave frequency and increases monotonically with the increasing cross-sectional area of the defect. Signals from simulated corrosion pits, on the other hand, showed that the reflection coefficient from these volumetric defects is dependent on both the cross-sectional area and the axial extent of the defect as well as on the wave frequency. The results indicated that it is feasible to differentiate planar from volumetric defects and to determine the defect size -- namely, its cross-sectional area and axial extent if it is volumetric.

Citation Download Citation

Hegeon Kwun and Chris P. Dynes "Long-range guided wave inspection of pipe using magnetostrictive sensor technology: the feasibility of defect characterization", Proc. SPIE 3398, Nondestructive Evaluation of Utilities and Pipelines II, (15 March 1998); https://doi.org/10.1117/12.302530

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