Dr. Dae-Cheol Seo Profile

Dr. Dae-Cheol Seo

Research Scientist at Korea Research Inst of Standards and Science

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Publications (6)

Proceedings Article | 29 April 2009 Paper

Feasibility study for monitoring of off-shore pipelines using BOTDA system

Il-Bum Kwon, Guohua Jin, Dae-Cheol Seo, Chi-Yeop Kim, Nam-Kwon Lee, Chung-Bang Yun

Proceedings Volume 7317, 73170O (2009) https://doi.org/10.1117/12.821984

KEYWORDS: Fiber optics sensors, Sensors, Fiber optics, Laser scattering, Pulsed laser operation, Spatial resolution, Polarization, Fiber optics tests, Fiber lasers, Data acquisition

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Proceedings Article | 8 April 2009 Paper

Sensitivity enhancement of fiber optic FBG sensor for acoustic emission

Dae-Cheol Seo, Dong-Jin Yoon, Il-Bum Kwon, Seung-Suk Lee

Proceedings Volume 7294, 729415 (2009) https://doi.org/10.1117/12.821516

KEYWORDS: Sensors, Fiber optics sensors, Fiber Bragg gratings, Fiber optics, Ferroelectric materials, Acoustic emission, Lead, Acoustics, Fiber optics tests, Denoising

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Proceedings Article | 16 May 2008 Paper

Fiber optic acoustic sensors for crack growth diagnostics

Dae-Cheol Seo, Il-Bum Kwon, Chi-Yeop Kim, Dong-Jin Yoon

Proceedings Volume 7004, 70044T (2008) https://doi.org/10.1117/12.786140

KEYWORDS: Sensors, Fiber Bragg gratings, Fiber optics sensors, Acoustics, Light sources, Semiconductor lasers, Fiber optics, Diagnostics, Aluminum, Signal detection

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Proceedings Article | 22 April 2008 Paper

Smart acoustic emission system for wireless monitoring of concrete structures

Dong-Jin Yoon, Young-Gil Kim, Chi-Yeop Kim, Dae-Cheol Seo

Proceedings Volume 6932, 69323A (2008) https://doi.org/10.1117/12.777545

KEYWORDS: Sensors, Acoustic emission, Nondestructive evaluation, Algorithm development, Safety, Bridges, Signal processing, Metrology, Defect detection, Signal generators

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Acoustic emission (AE) has emerged as a powerful nondestructive tool to detect preexisting defects or to characterize failure mechanisms. Recently, this technique or this kind of principle, that is an in-situ monitoring of inside damages of materials or structures, becomes increasingly popular for monitoring the integrity of large structures. Concrete is one of the most widely used materials for constructing civil structures. In the nondestructive evaluation point of view, a lot of AE signals are generated in concrete structures under loading whether the crack development is active or not. Also, it was required to find a symptom of damage propagation before catastrophic failure through a continuous monitoring. Therefore we have done a practical study in this work to fabricate compact wireless AE sensor and to develop diagnosis system. First, this study aims to identify the differences of AE event patterns caused by both real damage sources and the other normal sources. Secondly, it was focused to develop acoustic emission diagnosis system for assessing the deterioration of concrete structures such as a bridge, dame, building slab, tunnel etc. Thirdly, the wireless acoustic emission system was developed for the application of monitoring concrete structures. From the previous laboratory study such as AE event patterns analysis under various loading conditions, we confirmed that AE analysis provided a promising approach for estimating the condition of damage and distress in concrete structures. In this work, the algorithm for determining the damage status of concrete structures was developed and typical criteria for decision making was also suggested. For the future application of wireless monitoring, a low energy consumable, compact, and robust wireless acoustic emission sensor module was developed and applied to the concrete beam for performance test. Finally, based on the self-developed diagnosis algorithm and compact wireless AE sensor, new AE system for practical AE diagnosis was demonstrated for assessing the conditions of damage and distress in concrete structures.

Proceedings Article | 15 April 2008 Paper

Two step signal processing of optical fiber mesh for intruder detection

Il-Bum Kwon, Dae-Cheol Seo, Chi-Yeop Kim, Dong-Jin Yoon

Proceedings Volume 6945, 69451P (2008) https://doi.org/10.1117/12.779688

KEYWORDS: Optical fibers, Signal processing, Fiber optics sensors, Speckle pattern, Fiber optics, Signal detection, Sensors, Data acquisition, Magnetic sensors, Infrared sensors

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Proceedings Article | 23 May 2005 Paper

Multiplexed optical loss based fiber optic sensor for displacement measurement

Il-Bum Kwon, Jung-Ae Yu, Chi-Yeop Kim, Dae-Cheol Seo, Seung Kwan Kim, Jae-Heung Jo

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.624251

KEYWORDS: Sensors, Fiber optics sensors, Multiplexing, Optical fibers, Mirrors, Head, Signal attenuation, Connectors, Reflectometry, Light scattering

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Showing 5 of 6 publications

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