Prof. Tadeusz Stepinski Profile

Prof. Tadeusz Stepinski

Professor at AGH Univ of Science and Technology

SPIE Involvement:

Author

Proceedings Article | 1 April 2019 Presentation + Paper

Rockbolt monitoring by means of guided waves

Tadeusz Stepinski

Proceedings Volume 10972, 109721C (2019) https://doi.org/10.1117/12.2513807

KEYWORDS: Wave propagation, Waveguides, Ultrasonics, Nondestructive evaluation, Phase velocity, Structural health monitoring, Inspection, Transducers, Sensors, Signal attenuation

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Proceedings Article | 19 April 2017 Paper

Time-frequency analysis of guided ultrasonic waves used for assessing integrity of rock bolts

Tadeusz Stepinski

Proceedings Volume 10171, 101710J (2017) https://doi.org/10.1117/12.2263109

KEYWORDS: Wave propagation, Wavelets, Electronic filtering, Signal attenuation, Ultrasonics, Time-frequency analysis, Ultrasonography, Device simulation, Nondestructive evaluation, Mining, Inspection

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Proceedings Article | 20 April 2016 Paper

Optimization of ultrasonic transducers for selective guided wave actuation

Mateusz Miszczynski, Pawel Packo, Paulina Zbyrad, Tadeusz Stepinski, Tadeusz Uhl, Jerzy Lis, Kazimierz Wiatr

Proceedings Volume 9803, 98030J (2016) https://doi.org/10.1117/12.2219548

KEYWORDS: Waveguides, Transducers, Ultrasonics, Optimization (mathematics), Structural health monitoring, Finite element methods, Nondestructive evaluation, Genetic algorithms, Solids, Ferroelectric materials, Chemical elements

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Proceedings Article | 20 April 2016 Presentation + Paper

Interdigital transducers in structural health monitoring based on Lamb waves: a state of the art

Tadeusz Stepinski, Michał Mańka, Adam Martowicz, Vivek Rathod

Proceedings Volume 9803, 98030N (2016) https://doi.org/10.1117/12.2222144

KEYWORDS: Structural health monitoring, Transducers, Ultrasonography, Mechanical engineering, Design for manufacturability, Electrodes, Microsoft Foundation Class Library, Ferroelectric materials, Wave plates, Composites, Epoxies, Finite element methods, Semiconducting wafers

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Proceedings Article | 1 April 2015 Paper

Separation of Lamb waves modes using polarization filter of 3D laser measured signals

Lukasz Ambrozinski, Tadeusz Stepinski, Tadeusz Uhl

Proceedings Volume 9437, 94371E (2015) https://doi.org/10.1117/12.2084047

KEYWORDS: Polarization, Wave propagation, Phase shifts, Elliptical polarization, 3D metrology, Particles, Filtering (signal processing), Signal processing, 3D scanning, Electronic filtering

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Proceedings Article | 23 March 2015 Paper

Data fusion for compensation of temperature variations in Lamb-wave based SHM systems

Ziemowit Dworakowski, Lukasz Ambrozinski, Tadeusz Stepinski

Proceedings Volume 9438, 94381S (2015) https://doi.org/10.1117/12.2085124

KEYWORDS: Structural health monitoring, Signal processing, Temperature metrology, Transducers, Data fusion, Wave propagation, Sensors, Databases, Distributed interactive simulations, Environmental sensing

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Proceedings Article | 9 March 2014 Paper

2D aperture synthesis for Lamb wave imaging using co-arrays

Lukasz Ambrozinski, Tadeusz Stepinski, Tadeusz Uhl

Proceedings Volume 9064, 90642A (2014) https://doi.org/10.1117/12.2045424

KEYWORDS: Apodization, Phased arrays, Transmitters, Signal processing, Receivers, Image processing, Chemical elements, Transducers, Sensors, Structural health monitoring

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Proceedings Article | 11 April 2013 Paper

Designing 2D arrays for SHM of planar structures: a review

Tadeusz Stepinski, Lukasz Ambrozinski, Tadeusz Uhl

Proceedings Volume 8694, 86941R (2013) https://doi.org/10.1117/12.2010000

KEYWORDS: Structural health monitoring, Sensors, Phased arrays, Wave propagation, Image resolution, Transmitters, Computer simulations, Transducers, Ultrasonics, Optical simulations

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Monitoring structural integrity of large planar structures that aims at detecting and localizing impact or damage at any point of the structure requires normally a relatively dense network of uniformly distributed ultrasonic sensors. 2-D ultrasonic phased arrays, due to their beam-steering capability and all azimuth angle coverage are a very promising tool for structural health monitoring (SHM) of plate-like structures using Lamb waves (LW). Linear phased arrays that have been proposed for that purpose, produce mirrored image characterized by azimuth dependent resolution, which prevents unequivocal damage localization. 2D arrays do not have this drawback and they are even capable of mode selectivity when generating and receiving LWs. Performance of 2D arrays depends on their topology as well as the number of elements (transducers) used and their spacing in terms of wavelength. In this paper we propose a consistent methodology for three-step: theoretical, numerical and experimental investigation of a diversity of 2D array topologies in SHM applications. In the first step, the theoretical evaluation is performed using frequency-dependent structure transfer function (STF). STF that defines linear propagation of different LWs modes through the dispersive medium enables theoretical investigation of the particular array performance for a predefined tone-burst excitation signal. A dedicated software tool has been developed for the numerical evaluation of 2D array directional characteristics (beampattern) in a specific structure. The simulations are performed using local interaction simulation approach (LISA), implemented using NVIDIA CUDA graphical computation unit (GPU), which enables time-efficient 3D simulations of LWs propagation. Beampatterns of a 2D array can be to some extend evaluated analytically and using numerical simulations; in most cases, however, they require experimental verification. Using scanning laser vibrometer is proposed for that purpose, in a setup where LWs, excited by PZT transmitters of the investigated array are sensed in multiple points corresponding to the locations of the 2D array receiving elements. A virtual receiving sub-array is created in this way and the performance of various array architectures in the reception mode can be evaluated experimentally without the need of physical prototype; a change of topology requires only straightforward modification of the measurement points distribution at the tested structure. For illustration, beampatterns of three symmetrical 2D topologies, i.e., circular, star-shaped and spiralshaped, will be examined in the paper and compared in terms of their beam-width and side-lobes level. The effect of apodization applied to the array elements will be also investigated.

Proceedings Article | 5 April 2012 Paper

Experimental comparison of 2D arrays topologies for SHM of planar structures

Lukasz Ambrozinski, Pawel Packo, Tadeusz Stepinski, Tadeusz Uhl

Proceedings Volume 8347, 834717 (2012) https://doi.org/10.1117/12.917438

KEYWORDS: Wave propagation, Structural health monitoring, Nanoimprint lithography, Computer simulations, Sensors, Signal processing, Numerical simulations, Transducers, Actuators, Reflectors

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Proceedings Article | 9 April 2010 Paper

Using 2-D arrays for sensing multimodal Lamb waves

Marcus Engholm, Tadeusz Stepinski

Proceedings Volume 7649, 764913 (2010) https://doi.org/10.1117/12.847607

KEYWORDS: Phased arrays, Smoothing, Transducers, Structural health monitoring, Transmitters, Wave sensors, Ultrasonics, Dispersion, Electronic filtering, Signal to noise ratio

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Proceedings Article | 10 April 2008 Paper

Uniform circular array for structural health monitoring of composite structures

Tadeusz Stepinski, Marcus Engholm

Proceedings Volume 6935, 69352A (2008) https://doi.org/10.1117/12.785371

KEYWORDS: Phased arrays, Structural health monitoring, Sensors, Ultrasonics, Optical simulations, Composites, Chemical elements, Amplifiers, Wave propagation, Interference (communication)

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Proceedings Article | 19 April 2007 Paper

Design of piezoelectric transducers for health monitoring of composite aircraft structures

Tadeusz Stepinski, Marcus Engholm

Proceedings Volume 6531, 65310G (2007) https://doi.org/10.1117/12.715151

KEYWORDS: Transducers, Inspection, Composites, Sensors, Interfaces, Structural health monitoring, Ultrasonics, Adhesives, Acoustics, Aircraft structures

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Proceedings Article | 19 May 2005 Paper

Inspecting multilayered airspace structures using ultrasonic narrowband spectroscopy

Tadeusz Stepinski, Marcus Jonsson

Proceedings Volume 5767, (2005) https://doi.org/10.1117/12.599069

KEYWORDS: Transducers, Inspection, Aluminum, Ultrasonics, Adhesives, Spectroscopy, Nondestructive evaluation, Multilayers, Spectroscopes, Aerospace engineering

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