Dr. Umar Amjad Profile

Dr. Umar Amjad

Research Assistant and Teaching Assistant at Univ of Arizona

SPIE Involvement:

Author

Area of Expertise:

Non-Destructive Testing , Structure Health Monitoring , Guided Waves , Phase sensitive Acoustic Micsroscopy , Instrumentation

Publications (21)

Proceedings Article | 1 April 2019 Paper

Linear and non-linear analysis of composite plates using guided acoustic waves

H. Alnuaimi, U. Amjad, P. Russo, V. Lopresto, T. Kundu

Proc. SPIE. 10972, Health Monitoring of Structural and Biological Systems XIII

KEYWORDS: Ferroelectric materials, Waveguides, Glasses, Composites, Fourier transforms, Nondestructive evaluation, Wave plates, Ultrasonics, Transducers, Acoustics

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Proceedings Article | 23 April 2018 Presentation + Paper

Effects of transducers on guided wave based structural health monitoring

Umar Amjad, Christopher Blase , Hamad Alnuaimi, Cac Dao, Juergen Bereiter-Hahn , Tribikram Kundu

Proc. SPIE. 10600, Health Monitoring of Structural and Biological Systems XII

KEYWORDS: Ferroelectric materials, Waveguides, Image processing, Ceramics, Fourier transforms, Ultrasonics, Wave propagation, Transducers, Structural health monitoring, Acoustics

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Proceedings Article | 27 March 2018 Presentation + Paper

Characterization of dental tissue by reflection and transmission ultrasound microscopy

Christopher Blase , Umar Amjad, Tribikram Kundu, Juergen Bereiter-Hahn, Maximilian Blume , Robert Sader

Proc. SPIE. 10600, Health Monitoring of Structural and Biological Systems XII

KEYWORDS: Teeth, Tissues, Reflection, Ultrasonography, Microscopy, Receivers, Acoustics, Signal detection

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Proceedings Article | 1 April 2016 Presentation + Paper

Advanced signal processing technique for damage detection in steel tubes

Umar Amjad, Susheel Kumar Yadav, Cac Minh Dao, Kiet Dao, Tribikram Kundu

Proc. SPIE. 9805, Health Monitoring of Structural and Biological Systems 2016

KEYWORDS: Ferroelectric materials, Waveguides, Fourier transforms, Nondestructive evaluation, Ultrasonics, Wave propagation, Transducers, Signal processing, Structural health monitoring, Damage detection, Received signal strength

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SPIE Journal Paper | 21 September 2015

Detection and quantification of delamination in laminated plates from the phase of appropriate guided wave modes

Umar Amjad, Susheel Kumar Yadav, Tribikram Kundu

OE Vol. 55 Issue 01

KEYWORDS: Transducers, Aluminum, Wave plates, Waveguides, Wave propagation, Optical engineering, Electrodes, Feature extraction, Damage detection, Dispersion

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Proceedings Article | 23 March 2015 Paper

Guided wave technique for non-destructive testing of StifPipe

Umar Amjad, Susheel Yadav, Chi Nguyen, Mohammad Ehsani, Tribikram Kundu

Proc. SPIE. 9438, Health Monitoring of Structural and Biological Systems 2015

KEYWORDS: Ferroelectric materials, Waveguides, Glasses, Wavelets, Inspection, Nondestructive evaluation, Wave propagation, Signal processing, Fiber reinforced polymers, Continuous wavelet transforms

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Proceedings Article | 9 March 2014 Paper

Effect of applied load on the nondestructive measurement of concrete strength

E. Mahmoudabadi, U. Amjad, T. Kundu, H. Saadatmanesh

Proc. SPIE. 9064, Health Monitoring of Structural and Biological Systems 2014

KEYWORDS: Transmitters, Ferroelectric materials, Fourier transforms, Nondestructive evaluation, Receivers, Ultrasonics, Cements, Time metrology, Transducers, Velocity measurements

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Proceedings Article | 17 April 2013 Paper

Monitoring ageing of alkali resistant glass fiber reinforced cement (GRC) using guided ultrasonic waves

J. Eiras, U. Amjad, E. Mahmoudabadi, J. Payá, M. Bonilla, T. Kundu

Proc. SPIE. 8695, Health Monitoring of Structural and Biological Systems 2013

KEYWORDS: Waveguides, Glasses, Composites, Inspection, Fourier transforms, Nondestructive evaluation, Ultrasonics, Cements, Civil engineering, Acoustics

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Proceedings Article | 17 April 2013 Paper

Change in time-of-flight of longitudinal (axisymmetric) wave modes due to lamination in steel pipes

U. Amjad, Chi Hanh Nguyen, S. Yadav, E. Mahmoudabadi, T. Kundu

Proc. SPIE. 8695, Health Monitoring of Structural and Biological Systems 2013

KEYWORDS: Ferroelectric materials, Waveguides, Dispersion, Fourier transforms, Nondestructive evaluation, Ultrasonics, Wave propagation, Transducers, Signal processing, Structural health monitoring

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Proceedings Article | 26 April 2011 Paper

Zero order mode selective excitation and highly resolved observations of lamb waves

A. Abdelrahman, U. Amjad, D. Jha, K. Tarar, W. Grill

Proc. SPIE. 7984, Health Monitoring of Structural and Biological Systems 2011

KEYWORDS: Signal to noise ratio, Ferroelectric materials, Sensors, Fourier transforms, Wave propagation, Transducers, Signal processing, Aluminum, Acoustics, Signal detection

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Proceedings Article | 18 April 2011 Paper

Lattice dynamics approach to determine the dependence of the time-of-flight of transversal polarized acoustic waves on external stress

K. Tarar, M. Pluta, U. Amjad, W. Grill

Proc. SPIE. 7984, Health Monitoring of Structural and Biological Systems 2011

KEYWORDS: Dispersion, Computer simulations, 3D modeling, Ultrasonics, Wave propagation, Solids, Differential equations, Chemical elements, Acoustics, Phase velocity

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Proceedings Article | 1 April 2011 Paper

Determination of the stress dependence of the velocity of Lamb waves in aluminum plates

U. Amjad, D. Jha, K. Tarar, H. Klinghammer, W. Grill

Proc. SPIE. 7984, Health Monitoring of Structural and Biological Systems 2011

KEYWORDS: Waveguides, Electrodes, Fourier transforms, Wave plates, Ultrasonics, Wave propagation, Transducers, Structural health monitoring, Aluminum, Lead

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Proceedings Article | 1 April 2011 Paper

Metamorphosis of bulk waves to Lamb waves in anisotropic piezoelectric crystals

A. Shelke, A. Habib, U. Amjad, M. Pluta, T. Kundu, U. Pietsch, W. Grill

Proc. SPIE. 7984, Health Monitoring of Structural and Biological Systems 2011

KEYWORDS: Holograms, Holography, Visualization, Dispersion, Ultrasonography, Crystals, X-rays, Wave plates, Wave propagation, Acoustics

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Proceedings Article | 9 April 2010 Paper

Generalized representations and universal aspects of Lamb wave dispersion relations

U. Amjad, K. Tarar, A. Shelke, T. Kundu, M. Pluta, W. Grill