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
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Journal ArticleDOI
A review on pipeline integrity management utilizing in-line inspection data
Mingjiang Xie,Zhigang Tian +1 more
TL;DR: A comprehensive review on pipeline integrity management based on ILI data is provided, including physics-based models and data-driven methods for predicting defect growth for pipelines with different categories of defects.
Journal ArticleDOI
Lamb wave tomography of pipe-like structures.
Kevin R. Leonard,Mark K. Hinders +1 more
TL;DR: A meridional-array scheme which mimics a single line of transducers along the exterior surface of the pipe in the axial direction is described, and proof of concept results on a pipe sample with an internal wall-thinning are shown.
Journal ArticleDOI
Guided wave helical ultrasonic tomography of pipes
Kevin R. Leonard,Mark K. Hinders +1 more
TL;DR: A new variation called helical ultrasound tomography (HUT) is described that uses guided ultrasonic waves along with tomographic reconstruction algorithms that have been developed by seismologists for what they call "cross borehole" tomography.
Journal ArticleDOI
Mode conversion behavior of SH guided wave in a tapered plate
TL;DR: In this paper, the authors explored mode conversion of shear horizontal (SH) guided wave when it impinges on smooth defects in plates and found that the fundamental (SH 0 ) and the first higher (SH 1 ) modes exhibited unique mode conversion behaviors in tapered edge.
Journal ArticleDOI
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, which is capable of modulating the phase change of SV-wave while keeping the phase of P-wave unchanged.
References
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Book ChapterDOI
Experiences in the Use of Guided Ultrasonic Waves to Scan Structures
TL;DR: The use of guided ultrasonic waves to rapidly interrogate large structures is a topic that is currently receiving considerable attention as mentioned in this paper, and the use of EMATs as the sensors to excite and detect the guided ultrasound modes has been extensively studied.