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EMAT pipe inspection technique using higher mode torsional guided wave T(0,2)

Nurmalia / Nakamura, N. / Ogi, H. / Hirao, M.

We developed a pitch-catch system based on electromagnetic acoustic transducers (EMATs) for pipe inspection, which moves inside the pipe in the axial direction. The first higher mode, T(0,2), of the torsional guided wave is transmitted and detected, and variations of amplitude and phase are measured while moving the EMATs. Several aluminum pipes containing dish-shaped defects are inspected, and the amplitude and phase show enough detection sensitivity. It is found that the phase measurement has better potential as a tool for quantitative inspection. The applicability of the technique for steel pipe is also confirmed.

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EMAT pipe inspection technique using higher mode torsional guided wave T(0,2)

Nurmalia / Nakamura, N. / Ogi, H. / Hirao, M.

We developed a pitch-catch system based on electromagnetic acoustic transducers (EMATs) for pipe inspection, which moves inside the pipe in the axial direction. The first higher mode, T(0,2), of the torsional guided wave is transmitted and detected, and variations of amplitude and phase are measured while moving the EMATs. Several aluminum pipes containing dish-shaped defects are inspected, and the amplitude and phase show enough detection sensitivity. It is found that the phase measurement has better potential as a tool for quantitative inspection. The applicability of the technique for steel pipe is also confirmed.

EMAT pipe inspection technique using higher mode torsional guided wave T(0,2)

Nurmalia / Nakamura, N. / Ogi, H. / Hirao, M.

We developed a pitch-catch system based on electromagnetic acoustic transducers (EMATs) for pipe inspection, which moves inside the pipe in the axial direction. The first higher mode, T(0,2), of the torsional guided wave is transmitted and detected, and variations of amplitude and phase are measured while moving the EMATs. Several aluminum pipes containing dish-shaped defects are inspected, and the amplitude and phase show enough detection sensitivity. It is found that the phase measurement has better potential as a tool for quantitative inspection. The applicability of the technique for steel pipe is also confirmed.

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Document information

Title:

EMAT pipe inspection technique using higher mode torsional guided wave T(0,2)

Contributors:

Nurmalia (author) / Nakamura, N. (author) / Ogi, H. (author) / Hirao, M. (author)

Remarks:

AA10816574

DOI:

https://doi.org/10.1016/j.ndteint.2017.01.009

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

EMAT , Torsional guided wave , Pipe inspection , Phase , Mode conversion

Classification:

DDC: 621 / 624

Licence:

https://creativecommons.org/licenses/by-nc-nd/4.0/

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