Prof. Donghyeon Ryu Profile

Prof. Donghyeon Ryu

Associate Professor at New Mexico Tech

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 9 May 2024 Presentation + Paper

Multiphysics characterization of light intensity and wavelength of mechanoluminescent ZnS:Cu-PDMS microcomposites

Matthew Moore, Donghyeon Ryu

Proceedings Volume 12949, 1294910 (2024) https://doi.org/10.1117/12.3013339

KEYWORDS: Polydimethylsiloxane, Video, Color, High speed cameras, Digital image correlation, Zinc sulfide, Mixtures, Emission wavelengths

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Proceedings Article | 9 May 2024 Presentation + Paper

Mechano-luminescence-optoelectronic strain sensing strips for health monitoring wearables

Donghyeon Ryu, Geronimo Macias

Proceedings Volume 12948, 129480D (2024) https://doi.org/10.1117/12.3013364

KEYWORDS: Sensors, Polydimethylsiloxane, Sensor networks, Thin films, Fabrication, Design, Structural health monitoring, Physical phenomena

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Proceedings Article | 9 May 2024 Presentation + Paper

Mechano-optoelectronic and micromechanical properties of conjugated polymeric thin films with nano-structured lamellae

Donghyeon Ryu, Alfred Mongare, Aaron Plant, Cason Jones, Kyungtae Kim, Yu-Lin Shen, Youngmin Lee

Proceedings Volume 12947, 129470A (2024) https://doi.org/10.1117/12.3012900

KEYWORDS: Thin films, Nanostructures, Materials properties, Polymers, Polymer thin films, Optoelectronics, Thin film manufacturing, Light absorption

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Proceedings Article | 28 March 2019 Paper

Autonomous structural composites for self-powered strain sensing-enabled damage detection

Alfred Mongare, Jordan Ulibarri-Sanchez, Aaron Misla, YoungHo Park, Andrei Zagrai, Donghyeon Ryu

Proceedings Volume 10970, 1097015 (2019) https://doi.org/10.1117/12.2514360

KEYWORDS: Composites, Damage detection, Fiber reinforced polymers, Unmanned aerial vehicles, Analytical research, Directed self assembly, Zinc, Molybdenum, System identification, Sensors

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Proceedings Article | 12 April 2017 Paper

Development of self-powered strain sensor using mechano-luminescent ZnS:Cu and mechano-optoelectronic P3HT

Elias Pulliam, George Hoover, Dhruv Tiparti, Donghyeon Ryu

Proceedings Volume 10168, 101680G (2017) https://doi.org/10.1117/12.2260318

KEYWORDS: Composites, Sensors, Thin films, Sensor technology, Biomimetics, Energy harvesting, Aerospace engineering, Failure analysis, Damage detection, Structural health monitoring, Absorption, Silicon, Semiconducting wafers, Image processing, Molybdenum

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Proceedings Article | 22 June 2016 Presentation

Characterization of light emission from mechanoluminescent composites subjected to high-rate compressive loading (Conference Presentation)

Donghyeon Ryu, Nicolas Castaño, Raj Bhakta, Michael Romero, Jamie Kimberley

Proceedings Volume 9803, 98030P (2016) https://doi.org/10.1117/12.2219530

KEYWORDS: Thin films, Composites, Sensors, Crystals, High speed cameras, Damage detection, Photonic crystals, Europium, Image processing, RGB color model

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This study aims to devise multifunctional composites using fracto-mechanoluminescent (FML) materials and photoactive sensing thin films for autonomous and self-powered impact damage detection. In previous studies, multifunctional photoactive thin films were suggested as a strain sensor that does not require any external electrical source. Instead, the photoactive thin films generated direct current (DC) (or photocurrent) under ambient light, whose magnitude varied linearly with applied strain. In this study, multifunctional FML materials-photoactive thin film composites will be devised for autonomously sensing high-speed compressive strains without supplying any external photonic or electrical energy. FML materials exhibit transformative properties that emit light when its crystalline structures are fractured. The developed photoactive strain sensing thin film will be integrated with the FML materials. Thus, it is envisioned that the FML materials will emit light, which will be supplied to the photoactive sensing thin films when the high-speed compressive loadings break FML materials’ crystalline structures. First, synthesized europium tetrakit(dibenzoylmethide) triethylammonium (EuD4TEA) crystals will be embedded in the elastomeric and transparent polydimethylsiloxane (PDMS) matrix to prepare test specimens. Second, the FML properties of the EuD4TEA-PDMS composites will be characterized at various compressive strains, which will be applied by Kolsky bar testing setup. Light emission from the EuD4TEA-PDMS test specimens will be recorded using a high-speed camera. Intensity of the light emissions will be quantified via image processing techniques by taking into account pixel profiles of the high-speed camera captured images (e.g., pixel values, counts of pixels, and RGB values) at various levels of compressive strains. Lastly, the autonomous high-speed compressive sensor modules will be fabricated by integrating the EuD4TEA-PDMS composites with the photoactive thin film sensor. Self-powered sensing capability will be validated by measuring DC at various compressive strains.

Proceedings Article | 9 March 2014 Paper

Photoactive and self-sensing P3HT-based thin films for strain and corrosion monitoring

Donghyeon Ryu, Kenneth Loh

Proceedings Volume 9058, 90580Z (2014) https://doi.org/10.1117/12.2038729

KEYWORDS: Thin films, Corrosion, Structural health monitoring, Optical fabrication, Sensors, System identification, Multifunctional materials, Polymers, Nanolithography, Spectrophotometry

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Proceedings Article | 14 April 2011 Paper

Validation of photocurrent-based strain sensing using a P3HT-based nanocomposite

Donghyeon Ryu, Kenneth Loh, Frank Yaghmaie

Proceedings Volume 7981, 79810G (2011) https://doi.org/10.1117/12.881180

KEYWORDS: Thin films, Nanocomposites, Sensors, Polymers, Coating, Carbon nanotubes, Nanolithography, Positron emission tomography, Fiber optics sensors, Remote sensing

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Showing 5 of 8 publications

Conference Committee Involvement (8)

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2025

17 March 2025 | Vancouver, B.C., Canada

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2024

25 March 2024 | Long Beach, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2023

13 March 2023 | Long Beach, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

7 March 2022 | Long Beach, California, United States

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

22 March 2021 | Online Only, California, United States

Showing 5 of 8 Conference Committees

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