Journal ArticleDOI
A laser–EMAT system for ultrasonic weld inspection
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TLDR
In this paper, a non-contacting NDT method using a pulsed laser and an electromagnetic acoustic transducer (EMAT) has been described, which has the potential to interrogate the entire cross-section of a weld.About:
This article is published in Ultrasonics.The article was published on 1999-04-01. It has received 59 citations till now. The article focuses on the topics: Electromagnetic acoustic transducer & Nondestructive testing.read more
Citations
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Journal ArticleDOI
Quality assessment in laser welding: a critical review
TL;DR: In this paper, the authors present relevant studies being classified according to the technology implemented (vision, camera, acoustic emissions, ultrasonic testing (UT), eddy current technique (ECT)) for the quality inspection.
Journal ArticleDOI
Detection of cracks in metal sheets using pulsed laser generated ultrasound and EMAT detection.
TL;DR: The presence of a crack-like defect on the sheet can be detected by either a sudden change in the ultrasonic waveform or by an enhancement in the frequency content of the waveform when the laser beam illuminates directly onto the crack.
Journal ArticleDOI
A novel technique for visualizing ultrasonic waves in general solid media by pulsed laser scan
TL;DR: In this article, the authors proposed a novel technique to visualize ultrasonic waves propagated in a general solid medium, where a sample was scanned by a pulsed laser for generation of ultrasound, and the propagated waves were received by a fixed transducer.
Journal ArticleDOI
Weld defect detection using PPM EMAT generated shear horizontal ultrasound
P. A. Petcher,Steve Dixon +1 more
TL;DR: In this paper, a PPM EMAT generated shear horizontal (SH) wave was used to inspect Austenitic welds and all defects were identified from every side of the weld/plate using the SH waves.
Journal ArticleDOI
A new magnetic configuration for a small in-plane electromagnetic acoustic transducer applied to laser-ultrasound measurements: Modelling and validation
TL;DR: In this article, an enhanced in-plane electromagnetic acoustic transducer (EMAT) was presented for detecting laser-generated ultrasound. But instead of using post-processing of numerical data to enhance signal-to-noise, the authors describe a new EMAT design to increase the magnetic flux density applied to the sample.
References
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Book
Wave propagation in elastic solids
TL;DR: In this article, the linearized theory of elasticity was introduced and the elasticity of a one-dimensional motion of an elastic continuum was modeled as an unbound elastic continuum.
Journal ArticleDOI
Generation of Elastic Waves by Transient Surface Heating
TL;DR: In this article, the authors analyzed the elastic wave amplitude with respect to the characteristics of the input heat flux and the thermal and elastic properties of the body and found that the latter may be much greater than the former, as experiments have demonstrated.
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.
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Mechanisms of electromagnetic generation and detection of ultrasonic Lamb waves in iron‐nickel alloy polycrystals
TL;DR: In this paper, measurements of the efficiencies of electromagnetic generation and detection of ultrasonic Lamb waves in Armco iron, 1018 steel, nickel, and Invar are presented as a function of both the static and dynamic magnetic field strengths in a geometry in which both are parallel to the surface.