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22 April 2020 Metamaterial-based amplification of multi-mode ultrasonic guided waves toward improved damage detection in pipelines (SPIE Best Student Paper Finalist)
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Abstract
In this paper, we present a gradient-index (GRIN) metamaterial lens design toward enhanced sensing by amplifying ultrasonic guided wave signal carrying defect information in pipelines. The curved GRIN lens conforms over the steel pipe and consists of cylindrical steel stubs with varying height according to the hyperbolic secant profile of the refractive index around the circumference of the pipe. We design the lens to perform above the audible frequency range as utilized in ultrasonic inspection of pipelines. By tailoring the dispersion curves of the longitudinal and torsional pipe modes that are commonly used in guided wave testing elastic wave focusing is successfully achieved at focal spots of the lens. Amplification of the multi-mode guided wave signals is validated through experiments performed on a lab scale steel pipe.
Conference Presentation
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Danawe, G. Okudan, D. Ozevin, and S. Tol "Metamaterial-based amplification of multi-mode ultrasonic guided waves toward improved damage detection in pipelines (SPIE Best Student Paper Finalist)", Proc. SPIE 11376, Active and Passive Smart Structures and Integrated Systems XIV, 113761N (22 April 2020); https://doi.org/10.1117/12.2559785
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