Journal ArticleDOI
An SH-wave EMAT technique for gas pipeline inspection
Masahiko Hirao,Hirotsugu Ogi +1 more
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In this paper, a periodic-permanent-magnet (PPM) EMAT is placed inside the pipe, which generates and receives the SH guided waves traveling in the circumferential direction with the axial polarization.Abstract:
An EMAT technique has been developed to detect corrosion defects on the outer surfaces of steel pipelines. A periodic-permanent-magnet (PPM) EMAT is placed inside the pipe, which generates and receives the SH guided waves traveling in the circumferential direction with the axial polarization. Wheels installed on the PPM-EMAT facilitate the linear movement in the axial direction and are useful for a quick inspection. At each point in scanning, the amplitude and phase shift of the round-trip signals in the SH0 and SH1 modes are measured using a superheterodyne phase-sensitive detector. They respond uniquely to surface defects and provide relevant information for locating axial positions of defects and evaluating the depth. The amplitude and phase shift of the SH1 mode are more sensitive to the presence of the defects than those of the SH0 mode. This technique is useful even if the protective resin coating is tightly glued on the pipes and lowered the signal intensity.read more
Citations
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Journal ArticleDOI
Structural health monitoring using torsional guided wave electromagnetic acoustic transducers
Balint Herdovics,Frederic Cegla +1 more
TL;DR: Torsional guided wave inspection is widely used for pipeline inspection as mentioned in this paper, and piezoelectric and magnetostrictive transducers are most commonly used to generate torsional-guided waves.
Journal ArticleDOI
Variational mode decomposition linked wavelet method for EMAT denoise with large lift-off effect
TL;DR: A modified variational mode decomposition (VMD) linked wavelet method for EMAT denoising enables to suppress both high-frequency narrowband noise and normal noise in EMAT signals with a large lift-off detection condition.
Journal ArticleDOI
A direction-tunable shear horizontal mode array magnetostrictive patch transducer
TL;DR: In this paper, a direction-tunable shear-horizontal mode array magnetostrictive patch transducer (DT-SHMA-MPT) is developed based on the magnetstrictive effect.
Journal ArticleDOI
Health monitoring of axially-cracked pipes by using helically propagating shear-horizontal waves
TL;DR: In this paper, the authors used helically propagating shear-horizontal waves for structural health monitoring of axially-cracked pipes by using a magnetostrictive transducer.
Posted Content
Elastic metasurfaces for splitting SV- and P-waves in elastic solids
TL;DR: In this paper, an elastic metasurface for splitting SV- and P-waves is designed and demonstrated using full-wave finite element simulations using full wave finite element (FEM) simulations.
References
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Journal ArticleDOI
Review of progress in quantitative NDE: Williamsburg, VA, USA, 21–26 June 1987
Book ChapterDOI
2 – Guided Wave Propagation in Elongated Cylinders and Plates
T.R. Meeker,A.H. Meitzler +1 more
Journal ArticleDOI
Field dependence of coupling efficiency between electromagnetic field and ultrasonic bulk waves
TL;DR: In this paper, the magnetic-field dependence of the wave amplitudes was studied by examining the magnetic field dependence of a spiral elongated coil placed on a thin plate of low carbon steel, which receives the longitudinal and the shear waves propagating in the thickness direction in the presence of bias magnetic field.