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 (23)

Proceedings Article | 25 April 2023 Presentation + Paper

Acoustic source localization in composite plates using non-linear ultrasonic technique: SPC-I

H. Alnuaimi, U. Amjad, T. Kundu

Proceedings Volume 12488, 124880O (2023) https://doi.org/10.1117/12.2658631

KEYWORDS: Acoustics, Sensors, Composites, Ultrasonics, Source localization, Wave propagation, Engineering, Acoustic waves, Signal attenuation, Signal processing

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Proceedings Article | 19 April 2022 Paper

Inspection of steel tube welded joint using nonlinear ultrasonic technique

SeHyuk Park, Imraan Bokhari, Hamad Alnuaimi, Umar Amjad, Robert Fleischman, Tribikram Kundu

Proceedings Volume 12048, 120480V (2022) https://doi.org/10.1117/12.2611920

KEYWORDS: Ultrasonics, Nondestructive evaluation, Inspection, Wave propagation, Acoustics, Transducers, Frequency modulation, Defect detection, Damage detection, Waveguides

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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

Proceedings Volume 10972, 109720X (2019) https://doi.org/10.1117/12.2513783

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

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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

Proceedings Volume 10600, 106000F (2018) https://doi.org/10.1117/12.2300841

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

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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

Proceedings Volume 10600, 106000W (2018) https://doi.org/10.1117/12.2300510

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

Proceedings Volume 9805, 980511 (2016) https://doi.org/10.1117/12.2219417

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

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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, 011006, (September 2015) https://doi.org/10.1117/12.10.1117/1.OE.55.1.011006

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

Proceedings Volume 9438, 943805 (2015) https://doi.org/10.1117/12.2085571

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

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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

Proceedings Volume 9064, 90641R (2014) https://doi.org/10.1117/12.2045336

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

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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

Proceedings Volume 8695, 869515 (2013) https://doi.org/10.1117/12.2009897

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

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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

Proceedings Volume 8695, 86950Q (2013) https://doi.org/10.1117/12.2008984

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

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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

Proceedings Volume 7984, 798413 (2011) https://doi.org/10.1117/12.880602

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

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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

Proceedings Volume 7984, 79842R (2011) https://doi.org/10.1117/12.879315

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

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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

Proceedings Volume 7984, 798410 (2011) https://doi.org/10.1117/12.879902

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

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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

Proceedings Volume 7984, 798415 (2011) https://doi.org/10.1117/12.880598

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

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