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  • Guided Waves - University of Delaware

    2011-1-3 · Guided Waves Daniel S. Weile Department of Electrical and Computer Engineering University of Delaware ELEG 648—Guided Waves D. S. Weile Guided Waves

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  • Guided Wave - an overview | ScienceDirect Topics

    Accordingly, much of the research literature for guided waves is focused on modeling such phenomena. At higher frequencies, typically between about 50 kHz and 10 MHz, guided waves are used for nondestructive testing. For example, surface waves may be used to detect microcracking of the surface of a material, or to measure the properties of thin electroplated or painted layers deposited on a much …

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  • Intro to Guided Waves – Guidedwave

    2018-8-13 · The guided waves consist of postcritical reflections and refractions where the deepest layer has a faster velocity than the one above it. The general characteristics of guided P waves are similar to surface waves where the propagating waves are dispersive and their geometrical spreading behaves as …

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  • Wave‐Equation Dispersion Inversion of Guided P

    1997-5-1 · In this review article, the ultrasonic characterization of materials using guided plate waves and their usage to elucidate mechanical properties of plate-like structures is reviewed. The purpose here is to summarize and explain the large body of theoretical and experimental work in this developing field.

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  • Guided Waves in Plates and Their Use in Materials ...

    The guided P-wave dispersion curves are inverted to get the P-velocity tomogram. Figure 12a depicts a typical shot gather with guided P waves and its associated dispersion image. It is easy to iden-tify the fundamental-mode dispersion curve (white dashed line) with the maximum amplitudes in the

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  • Waveâ Equation Dispersion Inversion of Guided P

    Guided wave inspection of pipelines is now in routine use worldwide. The technique offers the possibility of rapid screening of long lengths of pipework for corrosion and other defects. A test range of 50m or more (25m in each direction) is commonly obtained from a single transducer position. Long range guided wave inspection techniques are also in development for several other applications ...

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  • Long Range Guided Wave Inspection Usage – Current ...

    2010-7-1 · Such waves may propagate long distances in planar and tubular structures and are used for pipe inspection. The principles and advantages of guided wave application to inspection of pipes or tubular structures are provided by Cawley et al. [3], [4], Lowe et al. [5] and Pei et al. [6].

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  • Application of ultrasonic guided waves for non

    2015-7-26 · Chapter 3 deals with plane waves in homogeneous isotropic, anisotropic, and ferrite media. The transmission line theory for propagation through a multilayered medium is developed. The new material added to this chapter is on dyadic Green's functions for layered media, which is important for many current problems associated with planar transmission lines and microstrip patch resonators.

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  • Phys. Rev. Applied 11, 024052 (2019) - Elastic Phased ...

    2019-2-21 · Lamb waves and surface acoustic waves (SAWs) are of great interest for frontier technologies, including structural health monitoring, energy harvesting, sensors, and acoustic tweezers. This work presents elastic phased diffraction gratings, passive structures for controlling guided ultrasonic waves in solids. Such a grating adopts an array of interchangeable superstrates to modulate wave ...

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  • Observation of guided and reflection P-waves in urban ...

    2020-10-19 · P-waves in urban ambient noise crosscorrelations for i = 1,···,Ns sources are random variables. vj, zj, and rj for j = 1,···,Nr are the average velocity, the depth, and the reflectivity for the jth layer, respectively. vp(w) and vs(w) are the phase velocity of the guided P-wave and the Rayleigh

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  • Waveâ Equation Dispersion Inversion of Guided P

    The guided P-wave dispersion curves are inverted to get the P-velocity tomogram. Figure 12a depicts a typical shot gather with guided P waves and its associated dispersion image. It is easy to iden-tify the fundamental-mode dispersion curve (white dashed line) with the maximum amplitudes in the

    Get Price

  • ASNT NDT Library - $name

    2009-6-5 · Guided Ultrasonics Ltd. - 20 Training and Certification Active promotion of the GUL training scheme through unique hardware and software features: – Inspector has to log-on to the instrument with his personal operator key – Key keeps information about his certification and additional qualifications, as well as usage information

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  • Technology Overview – Guided Ultrasonics Limited

    2008-1-14 · (Source: 'Long Range Guided Wave Inspection Usage -- Current Commercial Capabilities and Research Directions,' M.J.S. Lowe and P. Cawley, Imperical College London, 29 March 2006 ----- available in website search). You claims it is wrong. Would you please show me the evidence?

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  • Guided Waves in NDT – Basics, Applications and Recent ...

    2019-2-21 · Lamb waves and surface acoustic waves (SAWs) are of great interest for frontier technologies, including structural health monitoring, energy harvesting, sensors, and acoustic tweezers. This work presents elastic phased diffraction gratings, passive structures for controlling guided ultrasonic waves in solids. Such a grating adopts an array of interchangeable superstrates to modulate wave ...

    Get Price
  • Guided Waves by Teletest Focus System - NDT.net

    The reliability of the wind turbine blade (WTB) evaluation using a new criterion is presented in the work. Variation of the ultrasonic guided waves (UGW) phase velocity is proposed to be used as a new criterion for defect detection. Based on an intermediate value between the maximum and minimum values, the calculation of the phase velocity threshold is used for defect detection, location and ...

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  • Phys. Rev. Applied 11, 024052 (2019) - Elastic Phased ...

    2019-7-31 · J.L. Rose, Ultrasonic Guided Waves in Solid Media (Cambridge University Press, USA, 2014) CrossRef Google Scholar 10. A. Kumar, Correlation of microstructure and mechanical properties with ultrasonic parameters in metallic materials.

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  • Waveâ Equation Dispersion Inversion of Guided P

    The guided P-wave dispersion curves are inverted to get the P-velocity tomogram. Figure 12a depicts a typical shot gather with guided P waves and its associated dispersion image. It is easy to iden-tify the fundamental-mode dispersion curve (white dashed line) with the maximum amplitudes in the

    Get Price

  • Guided GPR Waves: Leibniz-Institut für Angewandte ...

    The idea behind this method lies in the usage of guided electromagnetic waves that travel vertically along the waveguide and are reflected at its lower end (fig. 1). Through knowledge of the waveguide’s depth, velocities in each depth interval can be calculated and, via …

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  • Wave‐Equation Dispersion Inversion of Guided P

    2018-8-13 · We present a dispersion-inversion method which inverts for the P-velocity model from guided waves propagating in wave guides of arbitrary geometry.Its misfit function is the squared summation of differences between the predicted and observed dispersion curves of guided P waves, and the inverted result is a high-resolution estimate of the near-surface P-velocity model.

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  • Guided waves' dispersion curves in anisotropic ...

    Guided waves propagating in lossy media are encountered in many problems across different areas of physics such as electromagnetism, elasticity and solid-state physics. They also constitute essential tools in several branches of engineering, aerospace and aircraft engineering, and …

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  • Guided Waves’ Dispersion Curves in Anisotropic ...

    2017-2-17 · Guided Waves’ Dispersion Curves in Anisotropic Viscoelastic Single- and Multi-layered Media F. Hernando Quintanilla a, Z. Fanb, M. J. S. Lowe and R. V. Crasterc aDepartment of Mechanical Engineering Imperial College, London SW7 2AZ, UK, bSchool of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue,

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  • Temperature affected guided wave propagation in a ...

    2019-9-27 · Benchmark datasets as a contribution to the Open Guided Waves platform obtained from a carbon fiber reinforced plastic (CFRP) plate under varying temperature conditions. The measurement data contain a large number of excitation frequencies for all actuator-sensor combinations. This enables a performance analysis using existing temperature correction algorithms and the development of novel ...

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  • Guided Waves by Teletest Focus System - NDT.net

    2008-1-14 · (Source: 'Long Range Guided Wave Inspection Usage -- Current Commercial Capabilities and Research Directions,' M.J.S. Lowe and P. Cawley, Imperical College London, 29 March 2006 ----- available in website search). You claims it is wrong. Would you please show me the evidence?

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  • Phys. Rev. Applied 11, 024052 (2019) - Elastic Phased ...

    2019-2-21 · Lamb waves and surface acoustic waves (SAWs) are of great interest for frontier technologies, including structural health monitoring, energy harvesting, sensors, and acoustic tweezers. This work presents elastic phased diffraction gratings, passive structures for controlling guided ultrasonic waves in solids. Such a grating adopts an array of interchangeable superstrates to modulate wave ...

    Get Price
  • Guided electromagnetic wave communications via an ...

    The guided waves 1004 can be used to transport signals received from and sent to a host device, base station, mobile devices, a building or other device by way of a communications interface 1008. The communications interface 1008 can be an integral part of system 1000. Alternatively, the communications interface 1008 can be tethered to system 1000.

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  • Guided Bloch Surface Waves on Ultrathin Polymeric

    2010-5-6 · We present a direct evidence of Bloch surface waves (BSWs) waveguiding on ultrathin polymeric ridges, supported by near-field measurements. It is demonstrated that near-infrared BSWs sustained by a silicon-based multilayer can be locally coupled and guided through dielectric ridges of nanometric thickness with low propagation losses. Using a conventional prism-based configuration, we ...

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  • 'USING GUIDED P-WAVES TO OBTAIN A HIGH

    A 2D P-wave velocity model of the near surface was created from fundamental mode dispersion curve trends of guided P-wave phase velocities. The fundamental mode of the dispersion curve trends was identified at a majority of geophone locations in our data set. Each of these geophones was selected as the central geophone within an optimum window (aperture), providing a laterally varying set of ...

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  • Guided GPR Waves: Leibniz-Institut für Angewandte ...

    The idea behind this method lies in the usage of guided electromagnetic waves that travel vertically along the waveguide and are reflected at its lower end (fig. 1). Through knowledge of the waveguide’s depth, velocities in each depth interval can be calculated and, via …

    Get Price
  • Guided Ultrasonic Waves for Impact Damage Detection in ...

    2015-7-21 · The sensitivity of guided waves for the detection of barely visible impact damage in composite panels has been verified. Keywords: Guided Ultrasonic Waves, Impact Damage, Composites 1. INTRODUCTION The usage of composite materials in aerospace structures has increased significantly as they offer significant advantages such as an improved ...

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  • 1 Scattering of guided waves at delaminations in

    2016-7-1 · 1 1 Scattering of guided waves at delaminations in composite plates 2 Bibi I.S. Murat a), Pouyan Khalili b), and Paul Fromme a) 3 a) Department of Mechanical Engineering, University College London, WC1E 7JE, UK 4 b) Department of Mechanical Engineering, Imperial College London, SW7 2AZ, UK 5 6 Email: [email protected] 7 8 Running title: Guided Wave Scattering at Delaminations

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  • Plasmon-polariton waves guided by thin lossy metal

    2000-4-15 · The purely bound electromagnetic modes of propagation supported by symmetric wave guide structures comprised of a thin lossy metal film of finite width embedded in an infinite homogeneous dielectric have been characterized at optical wavelengths. The modes supported are divided into four families depending on the symmetry of their fields. In addition to the four fundamental modes that exist ...

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  • Focusing on Plates: Controlling Guided Waves using ...

    2015-6-8 · Elastic waves are guided along finite structures such as cylinders, plates, or rods through reflection, refraction and mode conversion at the interfaces. Such wave propagation is ubiquitous in the ...

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  • Broadband and high‐efficiency conversion from

    2013-11-22 · Broadband and high-efficiency conversion from guided waves to spoof surface plasmon polaritons. Hui Feng Ma, State Key Laboratory of Millimetre Waves, School of Information Science and Engineering, Southeast University, Nanjing, 210096 China. Search for more papers by this author.

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  • by P-and S-type fault-zone-guided waves Deep rock

    Damage to fault-zone rocks during fault slip results in the formation of a channel of low seismic-wave velocities. Within such channels guided seismic waves, denoted by Fg, can propagate. Here we show with core samples, well logs and Fg-waves that such a channel is crossed by the SAFOD (San Andreas Fault Observatory at Depth) borehole at a depth of 2.7 km near Parkfield, California, USA.

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  • Absorption of high-frequency guided waves in a

    2007-10-24 · A kinetic theory model for the absorption of high-frequency guided plasma waves is presented for a warm, inhomogeneous, magnetized plasma column loaded inside a waveguide. Electron cyclotron resonance (ECR) absorption and Landau damping terms, derived as the anti-Hermitian part of the susceptibility tensor, are included in the model for a loss-free plasma-loaded waveguide …

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  • Guided electromagnetic wave communications via an ...

    The guided waves 1004 can be used to transport signals received from and sent to a host device, base station, mobile devices, a building or other device by way of a communications interface 1008. The communications interface 1008 can be an integral part of system 1000. Alternatively, the communications interface 1008 can be tethered to system 1000.

    Get Price
  • Guided Waves - University of Delaware

    2011-1-3 · P d 2P f D. S. Weile Guided Waves. Perturbation Theory The time average power flow is P f = 1 2 RefVI g= jV 0j 2 2RefZ 0g e 2 z Now, a power dissipated per unit length, P d must be responsible for the decrease: P d = dP f dz = 2 P f Therefore, if we can approximate P …

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  • Guided Wave - an overview | ScienceDirect Topics

    Guided waves offer the advantage of large-area inspection with a minimum number of installed sensors. In recent year, a large number of papers have been published on the use of Lamb waves for NDE and damage detection [13]. The advantages of Lamb and Rayleigh waves over P-waves for NDE applications were recognized in the early 1960s [1,8,14,15].

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  • Wave‐Equation Dispersion Inversion of Guided P

    2018-8-13 · In this paper, we present the theory for wave-equation inversion of guided P waves, where the misfit function is the sum of the squared differences between the wave numbers along the predicted and observed dispersion curves.This procedure, denoted as wave-equation dispersion inversion of guided P waves (WDG), is valid for near-surface waveguides with irregular layers.

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  • Plasmon-polariton waves guided by thin lossy metal

    2001-3-13 · 2001-3-13 · The purely bound electromagnetic modes of propagation supported by asymmetric waveguide structures, comprised of a thin lossy metal film of finite width on a dielectric substrate and covered by a different dielectric superstrate, have been characterized at optical wavelengths. The dispersion of the modes with film thickness and width has been assessed and the …

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  • Intro to Guided Waves – Guidedwave

    2000-4-15 · 2000-4-15 · The purely bound electromagnetic modes of propagation supported by symmetric wave guide structures comprised of a thin lossy metal film of finite width embedded in an infinite homogeneous dielectric have been characterized at optical wavelengths. The modes supported are divided into four families depending on the symmetry of their fields. In addition to the four …

    Get Price
  • Plasmon-polariton waves guided by thin lossy metal

    2018-8-13 · 2018-8-13 · We present a dispersion-inversion method which inverts for the P-velocity model from guided waves propagating in wave guides of arbitrary geometry.Its misfit function is the squared summation of differences between the predicted and observed dispersion curves of guided P waves, and the inverted result is a high-resolution estimate of the near-surface P-velocity model.

    Get Price
  • Wave‐Equation Dispersion Inversion of Guided P

    2019-11-11 · 2019-11-11 · on ultrasonic guided waves and a literature review of the different techniques for the evaluation of thickness with guided waves. The severity of the errors introduced in time-of-flight tomography for thickness reconstruction by breaking the assumption of the ray theory are investigated. As these errors are significant, the possibility of

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  • FEASIBILITY OF THICKNESS MAPPING USING

    2005-10-12 · 2005-10-12 · The scale of heterogeneities in the plate is selected to produce strong seismic scattering for P and S waves for frequencies over 2 Hz, with averaged P and S wave speed in the oceanic mantle of about V P = 8 km/s and V S = 4.6 km/s, and corresponding wave numbers for P and S waves of k P ∼ 1.6 km −1 and k S ∼ 2.7 km −1.

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  • Subduction zone guided waves and the heterogeneity ...

    2008-1-14 · 2008-1-14 · (Source: 'Long Range Guided Wave Inspection Usage -- Current Commercial Capabilities and Research Directions,' M.J.S. Lowe and P. Cawley, Imperical College London, 29 March 2006 ----- available in website search). You claims it is wrong. Would you please show me the evidence?

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