G
Geir Instanes
Researcher at University of Cincinnati
Publications - 23
Citations - 300
Geir Instanes is an academic researcher from University of Cincinnati. The author has contributed to research in topics: Guided wave testing & Ultrasonic sensor. The author has an hindex of 8, co-authored 22 publications receiving 243 citations.
Papers
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Journal ArticleDOI
Corrosion and erosion monitoring in plates and pipes using constant group velocity Lamb wave inspection
TL;DR: This paper proposes a novel method for suppressing the unwanted S0 mode based on the Poisson effect of the material by optimizing the angle of inclination of the equivalent transduction force of the Electromagnetic Acoustic Transducers (EMATs) used for generation and detection purposes.
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Guided wave tomography of pipes with high-order helical modes
TL;DR: In this paper, a general inversion method that extends the range of insonification angles by exploiting the information carried by the signals that wrap around the pipe multiple times before reaching the receive array, thus resulting in superior image resolution and increased depth estimation accuracy.
Journal ArticleDOI
Acoustic formulation of elastic guided wave propagation and scattering in curved tubular structures
TL;DR: This paper demonstrates that guided wave propagation and scattering can be approximated by an equivalent 2-D acoustic model which is inhomogeneous and elliptically anisotropic, and reveals the existence of an acoustic lensing effect which leads to a focusing phenomenon.
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Guided Wave Tomography of Pipe Bends
TL;DR: This paper provides the experimental demonstration of GWT of pipe bends based on a novel curved ray tomography algorithm and an optimal transducer configuration consisting of two ring arrays mounted at the ends of the elbows and a line of transducers fixed to the outer side of the elbow (extrados).
Proceedings ArticleDOI
Constant group velocity ultrasonic guided wave inspection for corrosion and erosion monitoring in pipes
TL;DR: In this article, a novel ultrasonic guided wave inspection technique for the monitoring of internal corrosion and erosion in pipes is described, which exploits the fundamental flexural mode to measure the average wall thickness over the inspection path.