Prof. Christoph Schaal Profile

Prof. Christoph Schaal

Associate Professor at California State University Northridge

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

Wave propagation , Composites , Nondestructive testing , Experimental mechanics , Smart structures

Publications (17)

Proceedings Article | 9 May 2024 Presentation + Paper

Automated transducer deployment for Lamb wave-based nondestructive evaluation of plates

Christoph Schaal, Ruben Granados, Morgan Barrett, Kathryn Davis

Proceedings Volume 12951, 1295117 (2024) https://doi.org/10.1117/12.3009829

KEYWORDS: Transducers, Ultrasound transducers, Nondestructive evaluation, Signal processing, Prototyping, Aluminum, Robotics, Dispersion, Ultrasonics

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Proceedings Article | 25 April 2023 Paper

Automated nondestructive testing of composites using air-coupled guided ultrasound

Christoph Schaal, Caroline Kühl, Julia Yagmur Vural, Pili Zinkewich

Proceedings Volume 12488, 124881P (2023) https://doi.org/10.1117/12.2658014

KEYWORDS: Design and modelling, Transducers, Nondestructive evaluation, Robotics, Aluminum, Dispersion, Composites, Phase velocity, Ultrasound transducers

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Proceedings Article | 25 April 2023 Presentation + Paper

On detecting regional inhomogeneity in composite plates using Lamb waves

Christoph Schaal, Melissa Chow, Paula Logozzo, Nareg Shirajian, Steffen Tai

Proceedings Volume 12488, 1248803 (2023) https://doi.org/10.1117/12.2657344

KEYWORDS: Transducers, Ultrasound transducers, Composites, Actuators, Signal to noise ratio, Nondestructive evaluation, Inhomogeneities, Wave propagation, Mode shapes

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Proceedings Article | 19 April 2022 Paper

Visualization and analysis of the scattering of high-intensity focused ultrasound at bone phantoms

Christoph Schaal, Divyadeep Upadhyay

Proceedings Volume 12048, 120480Q (2022) https://doi.org/10.1117/12.2612964

KEYWORDS: Image filtering, Wave propagation, Image processing, Image segmentation, Scattering, Computer vision technology

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Proceedings Article | 19 April 2022 Paper

Recent advancements on autonomous Lamb wave-based nondestructive inspection

Christoph Schaal, Alvin Miranda, Kevin Yanik, Ruben Granados

Proceedings Volume 12048, 120480D (2022) https://doi.org/10.1117/12.2613463

KEYWORDS: Inspection, Robots, Robotics, Nondestructive evaluation, Wave plates, Edge detection

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Proceedings Article | 22 March 2021 Presentation + Paper

Iterative learning control for high-intensity focused ultrasound treatments

Divyadeep Upadhyay, Christoph Schaal

Proceedings Volume 11593, 1159311 (2021) https://doi.org/10.1117/12.2583539

KEYWORDS: Ultrasonography, Model-based design, Transducers, Data modeling, Tissues, Performance modeling, Data centers, Ultrasonics, Therapeutics, Signal attenuation

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Proceedings Article | 22 March 2021 Presentation + Paper

Inverse fuzzy arithmetic for material characterization of composites using guided waves

Leonardo Araque, Lifu Wang, Ajit Mal, Christoph Schaal

Proceedings Volume 11593, 115930U (2021) https://doi.org/10.1117/12.2583947

KEYWORDS: Composites, Waveguides, Ultrasonics, Material characterization, Fuzzy logic, Data modeling, Velocity measurements, Uncertainty analysis, Optimization (mathematics), Nondestructive evaluation

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Proceedings Article | 21 March 2021 Poster + Presentation + Paper

Lamb wave-based nondestructive inspection using a mobile robotic platform

Cesar Gonzales, Artur Balyan, Marvin Mallari, Christoph Schaal

Proceedings Volume 11593, 115932V (2021) https://doi.org/10.1117/12.2583865

KEYWORDS: Robotics, Inspection, Nondestructive evaluation, Composites, Sensors, Transducers, Safety, Ultrasonography, Scatter measurement, Reliability

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Proceedings Article | 6 May 2020 Paper

Numerical and experimental investigation of damage detection in stiffened composite panels using guided ultrasonic waves

Steffen Tai, Fumika Kotobuki, Ajit Mal, Christoph Schaal

Proceedings Volume 11381, 1138102 (2020) https://doi.org/10.1117/12.2558845

KEYWORDS: Composites, Waveguides, Wave propagation, Scattering, Transducers, Ultrasonics, Damage detection, Wave plates, Nondestructive evaluation

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Proceedings Article | 23 April 2020 Paper

Uncertainty characterization of guided ultrasonic wave properties in composite materials

Leonardo Araque, Lifu Wang, Steffen Tai, Ajit Mal, Christoph Schaal

Proceedings Volume 11381, 113810J (2020) https://doi.org/10.1117/12.2558853

KEYWORDS: Dispersion, Fuzzy logic, Composites, Wave propagation, Waveguides, Ultrasonics, Material characterization, Systems modeling, Mechanics, Stochastic processes

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Proceedings Article | 1 April 2019 Paper

Experimental investigation of Lamb wave-based edge detection methods

Christoph Schaal, Matthew Brown, Katja Schulz

Proceedings Volume 10972, 1097223 (2019) https://doi.org/10.1117/12.2515452

KEYWORDS: Sensors, Transducers, Edge detection, Actuators, Waveguides, Wave propagation, Nondestructive evaluation, Aluminum

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Proceedings Article | 27 March 2018 Paper

Reverse engineering stiffened plates using guided wave-based nondestructive testing methods

Erin Hong, Christoph Schaal

Proceedings Volume 10600, 106000E (2018) https://doi.org/10.1117/12.2296745

KEYWORDS: Transducers, Receivers, Wave propagation, Nondestructive evaluation, Wave plates, Transmitters, Edge detection, Reverse engineering, Signal detection, Signal processing

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Proceedings Article | 27 March 2018 Presentation + Paper

Visualization of the scattering of focused ultrasonic waves at solid-fluid interfaces

Matthew Brown, Mehran Safisamghabadi, Christoph Schaal, Vibhav Durgesh

Proceedings Volume 10600, 106000V (2018) https://doi.org/10.1117/12.2296744

KEYWORDS: Bone, Visualization, Ultrasonics, Transducers, Scattering, Acoustics, Image visualization

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Proceedings Article | 5 April 2017 Paper

Parametric studies for semi-analytical investigation of plate-mounted resonators

Christoph Schaal, Robert M'Closkey, Ajit Mal

Proceedings Volume 10170, 101700O (2017) https://doi.org/10.1117/12.2262002

KEYWORDS: Wave propagation, Resonators, Modal analysis, Microresonators, Finite element methods, Microelectromechanical systems, Sensors, Motion models, Wave plates, Solids, Ultrasonics, Chemical elements, Gyroscopes, Superposition, Dispersion

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Proceedings Article | 5 April 2017 Presentation + Paper

Laser Doppler velocimetry and PZT sensing for the study of guided waves in a stepped aluminum plate

L. Maio, F. Ricci, V. Memmolo, N. D. Boffa, E. Monaco, A. Mal, C. Schaal

Proceedings Volume 10170, 101701S (2017) https://doi.org/10.1117/12.2260140

KEYWORDS: Wave propagation, Doppler effect, Wave plates, Nondestructive evaluation, Velocity measurements, Vibrometry, Waveguides, Aluminum, Actuators, Laser Doppler velocimetry, Transducers, Dispersion

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Proceedings Article | 5 April 2017 Paper

On the assumption of transverse isotropy of a honeycomb sandwich panel for NDT applications

Christoph Schaal, Steffen Tai, Ajit Mal

Proceedings Volume 10170, 1017022 (2017) https://doi.org/10.1117/12.2260092

KEYWORDS: Nondestructive evaluation, Composites, Ultrasonics, Aircraft structures, Waveguides, Defect detection, Wave propagation, 3D modeling, Dispersion, Phase velocity, Lawrencium

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