Guided Wave Research Papers - Academia.edu (original) (raw)

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- by and +1
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- Engineering, Mechanical Engineering, Lamb wave, Crack detection
- by Dumitru Mazilu
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- Numerical Analysis, Mathematical Sciences, Physical sciences, Waveguide

Received July 7, 2010; accepted August 20, 2010; posted August 23, 2010 (Doc. ID 131246); published September 23, 2010 In this paper, a parallel-plate ladder waveguide (PPLWG) is proposed for terahertz waveguiding. A modal analysis of the... more

- by Biss Aceh
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- Applied Mathematics, Optical Waveguides, Terahertz, Optical physics
- by Yong-gang Li
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- Geology, Multidisciplinary, Low Frequency, Seismic Waves

We have developed a super compact optical fluorescence spectrometer. Our innovative design combines advantages of guided wave planar optics and free-space microoptics. This innovation allows for miniaturization that is not achievable with pure planar or pure free-space optics. A prototype device has volume of its optical part below 1cm3. The spectrometer covers 450nm-650nm spectral range, and provides spectral resolution of

- by G. Auner
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- Optics, Image Processing, Lab On A Chip, Free Space Optics
- by Utpal Das
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- Materials Science, Semiconductor Devices, Molecular beam epitaxy, Optoelectronics

In this paper a novel approach based on Asymptotic Iteration Method (AIM) is presented to solve analytically the light propagation through one-dimensional inhomogeneous slab waveguide. Practically implemented optical slab waveguides based on traditional techniques are usually inhomogeneous and numerical methods are used to obtain guided wave characteristics. In this work, we develop analytical method for modal analysis includes Eigen modes

- by Ali Rostami
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- Mathematics, Modal Analysis, Numerical Method, Analytical Method
- by S. Tisserand
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- Mechanical Engineering, Optical Communication, Thin Film, Refractive Index
- by Gabriel Chao and +1
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- Engineering, Applied Physics, Mathematical Sciences, Physical sciences

Abstract- Application of guided waves for rail inspection in railroad industry is considered in the paper. They are particularly sensitive to vertical defects and they are used at relatively low frequency so they are not significantly attenuated by weld material. Dispersion curves and mode shapes for guided waves in rails were calculated using finite element technique. For the experiments a mode that only propagates in the web of the rail at frequency less than 100 kHz was chosen. Novel transducers were designed which produce in-plane displacements. For damping of the transducers a specially designed backing material composite was used in order to reduce the ringing effect of the piezo element at low frequencies. Experiments were conducted using a single transducer and array of four transducers. Different materials were evaluated for dry-coupling of the transducers to the rail surface. The experimental prototype system enables the screening of 20 meters of rail from a single array p...

- by Damyan Ganchev
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- Finite Element, Low Frequency, Guided Waves, Long Range
- by Akhlesh Lakhtakia
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- Algorithms, Anisotropy, Computer Simulation, Light
- by Ari Tervonen and +1
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- Photonics, Optical physics, Mach-zehnder Interferometer, Ion Exchange
- by Farhang Honarvar
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- Engineering, Elastic waves, Dispersion, Wave Equations
- by T. Kalkur
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- Optical physics, Optical Soliton, Second Order, Finite Difference
- by Helsin Wang
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- Engineering, Physical sciences, Regression Analysis, Sound and Vibration
- by Massimo Noro
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- Aerospace Engineering, Biochemistry, Chemistry, Numerical Analysis
- by Victor Giurgiutiu
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- Modeling, Structural Health Monitoring, Damage detection, Ultrasonic
- by Scott Hinton
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- Optical Switch, Guided Wave
- by ke wu
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- Computer Aided Design, Finite element method, Modal Analysis, Numerical Method
- by Tribikram Kundu
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- Mechanical Engineering, Water, Transducers, Signals
- by Giola Santoni and +1
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- Materials Engineering, Mechanical Engineering, Civil Engineering, Structural Health Monitoring

Nonlinear dynamics of surface and internal waves in a stratified ocean under the influence of the Earth's rotation is discussed. Attention is focussed upon guided waves long compared to the ocean depth. The effect of rotation on linear processes is reviewed in detail as well as the existing nonlinear models describing weakly and strongly nonlinear dynamics of long waves. The

- by Roger Grimshaw and +2
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- Geophysics, Nonlinear dynamics, Surveys, Ocean Wave
- by L. Torner
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- Modern physics, Solitons, Physical sciences, Guided Wave
- by Kay Raum
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- Technology, Ultrasound, Biological Sciences, Elasticity
- by Jean Piou
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- Multidisciplinary, Electromagnetic Theory, Electromagnetic Scattering, State Space

The proper electro-optical performance of devices utilizing Liquid Crystal materials require high optical/dielectric anisotropy, low threshold voltage, fast switching, and high thermal stability. Among these devises are liquid crystal... more

- by richard jimenez
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- Gold nanoparticle, Thermal Stability, Liquid Crystal, Liquid Crystal Display
- by Akhlesh Lakhtakia
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- Mathematical Sciences, Thin Film, Physical sciences, Wave propagation
- by Angel Vegas
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- Optical physics, Electrical And Electronic Engineering, Guided Wave
- by Naruemon Wattanapongsakorn
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- Optics, Free Space Optics, Chip, Guided Wave
- by Lahoucine Elmaimouni and +1
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- Engineering, Numerical Method, Functionally Graded Material, Equation of Motion
- by Victor Giurgiutiu and +1
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- Engineering, Signal Processing, Structural Health Monitoring, Damage detection

In this paper a detailed investigation of slot waveguides for optical sensing in near-IR wavelength region is carried out, assuming Silicon-on-Insulator technology. Optimized guided-wave structures are found in terms of high sensitivity (Sh) and low propagation losses (αprop) and design guidelines are clearly selected. A number of possible application fields for environmental monitoring are covered, including gas sensing (gas identification or measure of their physical parameters as pressure) and liquid sensing (as pollutants in water). Influence of fabrication tolerances and wavelength dependence are also studied.

- by Giovanni Giannoccaro
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- Genetics, Food Safety, Photonics, Environmental Monitoring
- by Alessandro Busacca and +1
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- Optics, Wavelength Conversion, Guided Wave, Lithium Niobate
- by Alessandro Busacca and +2
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- Nonlinear Optics, Computer Aided Design, Lithium, Computer Simulation
- by Alina Lupu
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- Materials Engineering, Comparative Analysis, Optical physics, Optical Materials
- by Ramadas Chennamsetti
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- Engineering, Finite element method, Ultrasound, Lamb wave
- by Amr Safwat
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- Transmission Line, Planar Waveguide, Guided Wave
- by Barry Luther-davies
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- Optics, Optical Switch, Nanowires, Silica
- by truong tran
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- Nanowires, Numerical Simulation, Physical sciences, Optical Soliton
- by Giancarlo C. Righini
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- Optical Sensor, Composite Material, Optical Properties, Optical Modulator

One of the main applications of guided waves is for pipe inspection, since its one-dimensional geometry allows inspecting long distances in a short time. As with most configurations (frequency, thickness) ultrasonic waves with many modes of propagation are generated, recent research focuses mostly on the generation and reception of specific modes, mainly by means of sophisticated arrays of transducers. In this paper this problem is addressed with a different approach, by processing ultrasonic signals with a low signal/noise ratio acquired with a single transducer in an pulse–echo configuration. In order to improve the evaluation of results, frequency bandpass filters and wavelet analysis were tested. Results showed that even when very noisy signals are utilized, signal processing improve the signal/noise (S/N) ratio up to 12 dB approximately and enhance the analysis of the results, thus demonstrating its usefulness.

- by Márcio Siqueira
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- Materials Engineering, Mechanical Engineering, Signal Processing, Wavelets

Guided elastic waves in the frequency range of a few hundred kHz, generated and detected by appro- priate transducer arrays, are used to monitor the structural integrity of pipes by comparing their actual state with a predefined reference state. For these purposes, theoretical, numerical, and experimental results are combined to study guided wave propagation and wave interaction with relevant defects in detail. Based on these findings, a guided wave based multi-channel structural health monitoring (SHM) system is designed and applied to identify and monitor structural defects in various piping components. The potential use of synthetic aperture techniques is discussed yielding spatial distributions of damage parameters along the pipe. The results reveal that guided wave based SHM in the kHz frequency regime has great potential for online monitoring of piping systems. It combines imaging techniques with long range detection capabilities and therefore closes the gap between local high...

- by D. Hentschel
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- Structural Health Monitoring, Structural Integrity, Low Frequency, High Frequency