Prof. Hoon Sohn Profile

Prof. Hoon Sohn

Professor at KAIST

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (75)

Proceedings Article | 25 April 2023 Presentation

Perturbation to optical polarization by laser-induced ultrasonic waves and its use for semiconductor characterization (Conference Presentation)

Yi He, Hoon Sohn, Zhongqing Su

Proceedings Volume 12488, 1248809 (2023) https://doi.org/10.1117/12.2658135

KEYWORDS: Ultrasonics, Polarization, Semiconductor lasers, Semiconductor characterization, Laser optics, Laser development, Photoelasticity, Crystals, Semiconductors, Anisotropy

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Proceedings Article | 25 April 2023 Presentation + Paper

Nonlinear ultrasonic analysis inspired by phase-based motion magnification

Peipei Liu, Zhanxiong Ma, Jinho Jang, Hoon Sohn

Proceedings Volume 12488, 124880L (2023) https://doi.org/10.1117/12.2657061

KEYWORDS: Ultrasonics, Video, Modulation, Material fatigue, Phase shift keying, Nonlinear optics, Tunable filters, Modulation frequency, Motion analysis, Denoising

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Proceedings Article | 25 April 2023 Presentation + Paper

Structural displacement estimation using high-sampling acceleration and temporally aliased low-sampling vision measurements

Zhanxiong Ma, Peipei Liu, Jaemook Choi, Hoon Sohn

Proceedings Volume 12488, 1248815 (2023) https://doi.org/10.1117/12.2646413

KEYWORDS: Error analysis, Aliasing, Sampling rates, Cameras, Accelerometers, Sensors, Finite impulse response filters

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Proceedings Article | 18 April 2023 Presentation + Paper

Nondestructive yield strength estimation for 3D-printed Ti-6Al-4V plates using eddy-current measurement

Hyung Jin Lim, Jongsu Lee, Hoon Sohn

Proceedings Volume 12486, 1248608 (2023) https://doi.org/10.1117/12.2655155

KEYWORDS: Electrical conductivity, 3D printing, Nondestructive evaluation, Metals, Materials properties

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Proceedings Article | 18 April 2022 Presentation + Paper

Fatigue crack prognosis of lifting-lug by nonlinear ultrasonic modulation

Jinho Jang, Hoon Sohn

Proceedings Volume 12046, 120460Y (2022) https://doi.org/10.1117/12.2606682

KEYWORDS: Ultrasonics, Modulation, Data modeling, Structural health monitoring, Nondestructive evaluation, Transducers

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Proceedings Article | 22 March 2021 Presentation + Paper

Detection of material nonlinearity using nonlinear ultrasonic three-wave mixing technique

Santhakumar Sampath, Hoon Sohn

Proceedings Volume 11592, 1159214 (2021) https://doi.org/10.1117/12.2581415

KEYWORDS: Ultrasonics, Safety, Aluminum

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Proceedings Article | 8 November 2020 Presentation + Paper

Development of novel integrated in-line inspection techniques for pipeline inspection

Santhakumar Sampath, Hoon Sohn, Bishakh Bhattacharya

Proceedings Volume 11525, 115250C (2020) https://doi.org/10.1117/12.2581420

KEYWORDS: Inspection, Corrosion, Safety, Metals, Temperature metrology, Sensors, Optical sensors, Optical design, Magnetism, Defect detection

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Proceedings Article | 4 May 2020 Paper

Nondestructive debonding detection of fiber reinforced plastics strengthened structure based on infrared thermal imaging with laser thermal excitation

Ying Xu, Hoon Sohn

Proceedings Volume 11379, 1137914 (2020) https://doi.org/10.1117/12.2552382

KEYWORDS: Thermography, Fiber reinforced polymers, Infrared imaging, Lamps, Halogens, Infrared cameras, Laser systems engineering, Infrared radiation, Thermal modeling, Image segmentation

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Proceedings Article | 22 April 2020 Paper

Coating thickness estimation in silicon wafer using ultrafast ultrasonic measurement

Peipei Liu, Kiyoon Yi, Hoon Sohn

Proceedings Volume 11381, 113811E (2020) https://doi.org/10.1117/12.2558380

KEYWORDS: Coating, Ultrasonics, Semiconducting wafers, Reflection, Ultrafast measurement systems, Reflectivity, Femtosecond phenomena, Gold

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Proceedings Article | 27 March 2019 Presentation + Paper

Online prognosis of fatigue crack at welded joints using nonlinear ultrasonic modulation

Hyung Jin Lim, Hoon Sohn

Proceedings Volume 10970, 109701H (2019) https://doi.org/10.1117/12.2513830

KEYWORDS: Ultrasonics, Modulation, Aluminum, Ferroelectric materials, Data acquisition, Structural health monitoring, Nonlinear optics, Transducers, Nondestructive evaluation, Artificial neural networks

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Proceedings Article | 27 March 2018 Presentation + Paper

A study on the detection of compressed micro-crack by nonlinear wave modulation technique

Sang Eon Lee, Hyung Jin Lim, Suyeong Jin, Hoon Sohn, Jung-Wuk Hong

Proceedings Volume 10598, 105982Z (2018) https://doi.org/10.1117/12.2300751

KEYWORDS: Modulation, Ferroelectric materials, Numerical analysis, Ultrasonics, Finite element methods, Wave propagation, Data modeling, Aluminum, Image processing, Photomicroscopy

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Proceedings Article | 27 March 2018 Presentation + Paper

Online fatigue crack quantification and prognosis using nonlinear ultrasonic modulation and artificial neural network

Hyung Jin Lim, Hoon Sohn

Proceedings Volume 10598, 105981L (2018) https://doi.org/10.1117/12.2300471

KEYWORDS: Ultrasonics, Artificial neural networks, Transducers, Structural health monitoring, Nondestructive evaluation

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Proceedings Article | 12 April 2017 Paper

A distributed cloud-based cyberinfrastructure framework for integrated bridge monitoring

Seongwoon Jeong, Rui Hou, Jerome Lynch, Hoon Sohn, Kincho Law

Proceedings Volume 10168, 101682W (2017) https://doi.org/10.1117/12.2270716

KEYWORDS: Bridges, Data modeling, Clouds, Databases, Structural health monitoring, Sensors, Information fusion, System integration, Safety, Computing systems, Web services, Roads, Finite element methods, Sensor networks

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Proceedings Article | 12 April 2017 Presentation + Paper

Accelerated damage visualization using binary search with fixed distance laser ultrasonic scanning

Byeongjin Park, Hoon Sohn

Proceedings Volume 10168, 101680T (2017) https://doi.org/10.1117/12.2261799

KEYWORDS: Ultrasonics, Visualization, Binary data, Wave propagation, Spatial resolution, Laser scanners, Damage detection, Laser development, Signal to noise ratio, Aluminum, Inspection, Pulsed laser operation, Associative arrays, Optical inspection

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Proceedings Article | 5 April 2017 Paper

Fatigue crack detection by nonlinear spectral correlation with a wideband input

Peipei Liu, Hoon Sohn

Proceedings Volume 10170, 101701Y (2017) https://doi.org/10.1117/12.2258746

KEYWORDS: Ultrasonics, Modulation, Aluminum, Transducers, Signal to noise ratio, Ferroelectric materials, Signal detection, Fourier transforms, Linear filtering

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Proceedings Article | 20 April 2016 Paper

A cloud-based information repository for bridge monitoring applications

Seongwoon Jeong, Yilan Zhang, Rui Hou, Jerome Lynch, Hoon Sohn, Kincho Law

Proceedings Volume 9803, 980313 (2016) https://doi.org/10.1117/12.2219064

KEYWORDS: Bridges, Databases, Sensors, Clouds, Data modeling, Roads, Finite element methods, Standards development, Systems modeling, Data storage

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Proceedings Article | 1 April 2016 Paper

Damage visualization using synchronized noncontact laser ultrasonic scanning

Peipei Liu, Timotius Yonathan Sunarsa, Hoon Sohn

Proceedings Volume 9805, 980514 (2016) https://doi.org/10.1117/12.2218700

KEYWORDS: Ultrasonics, Visualization, Laser systems engineering, Target detection, Corrosion, Q switched lasers, Nd:YAG lasers, Doppler effect, Laser Doppler velocimetry, Feature extraction, Wave propagation, Signal to noise ratio, Wavelets

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SPIE Journal Paper | 28 December 2015 Open Access

Special Section Guest Editorial:Structural Health Monitoring: Use of Guided Waves and/or Nonlinear Acoustic Techniques

Tribikram Kundu, Francesco Lanza di Scalea, Hoon Sohn

OE, Vol. 55, Issue 01, 011001, (December 2015) https://doi.org/10.1117/12.10.1117/1.OE.55.1.011001

KEYWORDS: Acoustics, Waveguides, Structural health monitoring, Nondestructive evaluation, Optical engineering, Civil engineering, Aerospace engineering, Ultrasonics, Smart structures, Structural engineering

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Proceedings Article | 24 April 2015 Paper

Detection of fatigue crack on a rotating steel shaft using air-coupled nonlinear ultrasonic modulation

Byeongju Song, Byeongjin Park, Hoon Sohn, Cheol-Woo Lim, Jae-Roung Park

Proceedings Volume 9435, 943513 (2015) https://doi.org/10.1117/12.2084982

KEYWORDS: Ultrasonics, Modulation, Distributed interactive simulations, Transducers, Manufacturing, Complex systems, Sensors, Inspection, Damage detection, Acoustic emission

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Proceedings Article | 3 April 2015 Paper

A data management infrastructure for bridge monitoring

Seongwoon Jeong, Jaewook Byun, Daeyoung Kim, Hoon Sohn, In Hwan Bae, Kincho Law

Proceedings Volume 9435, 94350P (2015) https://doi.org/10.1117/12.2177109

KEYWORDS: Sensors, Data modeling, Bridges, Databases, Data storage, Systems modeling, Data acquisition, Structural health monitoring, Prototyping, Data conversion

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Proceedings Article | 23 March 2015 Paper

Fatigue crack visualization using noncontact laser ultrasonics and state space geometrical changes

Peipei Liu, Hoon Sohn

Proceedings Volume 9438, 94380B (2015) https://doi.org/10.1117/12.2084484

KEYWORDS: Ultrasonics, Modulation, Visualization, Pulsed laser operation, Nd:YAG lasers, Nonlinear optics, Complex systems, Transducers, Laser Doppler velocimetry, Laser scanners

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Proceedings Article | 8 May 2014 Open Access

Noncontact laser sensing technology for structural health monitoring and nondestructive testing (presentation video)

Hoon Sohn

Proceedings Volume 9055, 90550W (2014) https://doi.org/10.1117/12.2049214

KEYWORDS: Structural health monitoring, Nondestructive evaluation, Laser applications, Video, Sensors, Spatial resolution, Bridges, Manufacturing, Semiconductor manufacturing, Wind turbine technology

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Proceedings Article | 9 March 2014 Paper

Development of a wireless nonlinear wave modulation spectroscopy (NWMS) sensor node for fatigue crack detection

Peipei Liu, Suyoung Yang, Hyung Jin Lim, Hyung Chul Park, In Chang Ko, Hoon Sohn

Proceedings Volume 9064, 906406 (2014) https://doi.org/10.1117/12.2045747

KEYWORDS: Sensors, Modulation, Acoustics, Ferroelectric materials, Active sensors, Spectroscopy, Field programmable gate arrays, Transducers, Signal processing, Algorithm development

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Proceedings Article | 8 March 2014 Paper

Non-contact visualization of nonlinear ultrasonic modulation for reference-free fatigue crack detection

Hyung Jin Lim, Byeongju Song, Byeongjin Park, Peipei Liu, Hoon Sohn

Proceedings Volume 9061, 90611B (2014) https://doi.org/10.1117/12.2046182

KEYWORDS: Modulation, Visualization, Ultrasonics, Laser Doppler velocimetry, Continuous wavelet transforms, Lawrencium, Optical filters, Aluminum, Transducers, Doppler effect

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Proceedings Article | 19 April 2013 Paper

Laser lock-in thermography for fatigue crack detection in an uncoated metallic structure

Yun-Kyu An, Ji Min Kim, Hoon Sohn

Proceedings Volume 8692, 86921K (2013) https://doi.org/10.1117/12.2009205

KEYWORDS: Thermography, Optical filters, Image filtering, Infrared cameras, Laser scanners, Continuous wave operation, Modulation, Wave propagation, Image visualization, Cameras

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Proceedings Article | 17 April 2013 Paper

Fatigue crack detection using guided waves nonlinear modulation

Hoon Sohn, Hyung Jin Lim, Martin DeSimio, Kevin Brown, Mark Derriso

Proceedings Volume 8695, 86950R (2013) https://doi.org/10.1117/12.2010108

KEYWORDS: Modulation, Lawrencium, Ultrasonics, Waveguides, Ferroelectric materials, Transducers, Nonlinear optics, Demodulation, Aluminum, Bandpass filters

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Proceedings Article | 20 April 2012 Paper

Laser ultrasonic imaging of a rotating blade

Byeongjin Park, Troung Thanh Chung, Chul Min Yeum, Hoon Sohn

Proceedings Volume 8348, 83481A (2012) https://doi.org/10.1117/12.918007

KEYWORDS: Ultrasonics, Ultrasonography, Sensors, Wave propagation, Pulsed laser operation, Signal to noise ratio, Aluminum, Laser development, Nd:YAG lasers, Wind energy

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Proceedings Article | 18 April 2012 Paper

Imaging of pipeline defects based on extraction of mode-converted guided waves

Hyeonseok Lee, Hoon Sohn, Hyun Woo Park

Proceedings Volume 8348, 83480C (2012) https://doi.org/10.1117/12.915508

KEYWORDS: Transducers, Waveguides, Microsoft Foundation Class Library, Chemical elements, Ultrasonography, Signal detection, Radio propagation, Composites, Inspection, 3D modeling

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Proceedings Article | 9 April 2012 Open Access

Laser based structural health monitoring for civil, mechanical, and aerospace systems

Hoon Sohn

Proceedings Volume 8345, 834502 (2012) https://doi.org/10.1117/12.921722

KEYWORDS: Ultrasonics, Ferroelectric materials, Pulsed laser operation, Structural health monitoring, Transducers, Sensors, Laser systems engineering, Sensing systems, Optical fibers, Photodiodes

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Proceedings Article | 14 April 2011 Paper

Pipeline monitoring using an integrated MFC/FBG system

Hyeonseok Lee, Hoon Sohn, Hyun Woo Park

Proceedings Volume 7981, 79812G (2011) https://doi.org/10.1117/12.880998

KEYWORDS: Fiber Bragg gratings, Waveguides, Transducers, Sensors, Microsoft Foundation Class Library, Tunable lasers, Photodiodes, Optical fibers, Structural health monitoring, Modulation

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Proceedings Article | 14 April 2011 Paper

Integrated impedance and guided wave based damage detection under temperature variation

Yun-Kyu An, Hoon Sohn

Proceedings Volume 7981, 79811Q (2011) https://doi.org/10.1117/12.880753

KEYWORDS: Waveguides, Ferroelectric materials, Damage detection, Temperature metrology, Signal detection, Multiplexers, Target designation, Algorithm development, Databases, Detection and tracking algorithms

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Proceedings Article | 14 April 2011 Paper

Development of a non-contact PZT excitation and sensing technology via laser

Hyun-Jun Park, Hoon Sohn, Chung-Bang Yun, Joseph Chung, Michael Lee

Proceedings Volume 7981, 79811A (2011) https://doi.org/10.1117/12.881927

KEYWORDS: Ferroelectric materials, Waveguides, Photodiodes, Transducers, Semiconductor lasers, Data transmission, Laser applications, Modulation, Sensing systems, High power lasers

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Proceedings Article | 1 April 2011 Paper

Investigating mode-converted Lamb wave signals induced by a notch on a beam in the frequency domain

Eun Kim, Hoon Sohn, Hyun Park

Proceedings Volume 7984, 798414 (2011) https://doi.org/10.1117/12.880909

KEYWORDS: Ferroelectric materials, Semiconducting wafers, Signal detection, Damage detection, Remote sensing, Fourier transforms, Signal to noise ratio, Wave propagation, Actuators, Polarization

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Proceedings Article | 1 April 2011 Paper

Impact localization in an aircraft fuselage using laser based time reversal

Hoon Sohn, Martin DeSimio, Sterven Olson, Kevin Brown, Mark Derriso

Proceedings Volume 7984, 79841G (2011) https://doi.org/10.1117/12.881912

KEYWORDS: Ferroelectric materials, Transducers, Convolution, Wave propagation, Doppler effect, Aluminum, Fourier transforms, Skin, Signal to noise ratio, Analytical research

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Proceedings Article | 31 March 2011 Paper

Delamination detection in a composite plate using a dual piezoelectric transducer network

Chul Min Yeum, Hoon Sohn, Jeong Beom Ihn

Proceedings Volume 7984, 798406 (2011) https://doi.org/10.1117/12.880942

KEYWORDS: Ferroelectric materials, Composites, Transducers, Wave propagation, Signal detection, Damage detection, Feature extraction, Environmental sensing, Structural health monitoring, Solids

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Proceedings Article | 9 April 2010 Paper

A comparison of 1D and 3D laser vibrometry measurements of Lamb waves

Eric Swenson, Hoon Sohn, Steven Olson, Martin Desimio

Proceedings Volume 7650, 765003 (2010) https://doi.org/10.1117/12.847362

KEYWORDS: Laser Doppler velocimetry, 3D metrology, Wave propagation, Wave plates, Head, Sensors, 3D scanning, Ferroelectric materials, Shape memory alloys, Connectors

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Proceedings Article | 9 April 2010 Paper

Understanding a reference-free impedance method using collocated piezoelectric transducers

Eun Jin Kim, Min Koo Kim, Hoon Sohn, Hyun Woo Park

Proceedings Volume 7650, 76502R (2010) https://doi.org/10.1117/12.847474

KEYWORDS: Ferroelectric materials, Semiconducting wafers, Actuators, Polarization, Wave propagation, Sensors, Transducers, Numerical simulations, Damage detection, Structural health monitoring

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Proceedings Article | 9 April 2010 Paper

Reference-free impedance-based crack detection in plate-like structures

Minkoo Kim, Eunjin Kim, Hyunwoo Park, Hoon Sohn

Proceedings Volume 7650, 76500Q (2010) https://doi.org/10.1117/12.848291

KEYWORDS: Ferroelectric materials, Adaptive optics, Structural health monitoring, Polarization, Environmental sensing, Damage detection, Nondestructive evaluation, Signal detection, Transducers, Sensors

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Proceedings Article | 9 April 2010 Paper

Delamination detection in composite structures using laser vibrometer measurement of Lamb waves

Hoon Sohn, Eric Swenson, Steven Olson, Martin DeSimio, Debaditya Dutta

Proceedings Volume 7650, 76500P (2010) https://doi.org/10.1117/12.847316

KEYWORDS: Composites, Transducers, Waveguides, Image filtering, Ferroelectric materials, Ultrasonics, Signal processing, Wave propagation, Velocity measurements, Image processing

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Proceedings Article | 9 April 2010 Paper

In situ PZT diagnostics using linear reciprocity under environmental and structural variations

Sang Jun Lee, Jennifer Michaels, Thomas Michaels, Hoon Sohn

Proceedings Volume 7650, 76500N (2010) https://doi.org/10.1117/12.847326

KEYWORDS: Ferroelectric materials, Transducers, Diagnostics, Waveguides, Aluminum, Actuators, Structural health monitoring, Wave propagation, Sensors, Time metrology

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Proceedings Article | 9 April 2010 Paper

Computational Lamb wave model validation using 1D and 3D laser vibrometer measurements

Steven Olson, Martin DeSimio, Matthew Davies, Eric Swenson, Hoon Sohn

Proceedings Volume 7650, 76500M (2010) https://doi.org/10.1117/12.847321

KEYWORDS: Laser Doppler velocimetry, Finite element methods, Sensors, 3D metrology, 3D modeling, Composites, Aluminum, Structural health monitoring, Signal processing, Wave propagation

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Proceedings Article | 1 April 2010 Paper

US-Korea collaborative research for bridge monitoring test beds

C. Yun, H. Sohn, J. Lee, S. Park, M. Wang, Y. Zhang, J. Lynch

Proceedings Volume 7647, 76473J (2010) https://doi.org/10.1117/12.847470

KEYWORDS: Bridges, Sensors, Structural health monitoring, Active sensors, Civil engineering, Damage detection, Ferroelectric materials, Environmental monitoring, Internet, Smart structures

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Proceedings Article | 1 April 2010 Paper

Experimental validations of a baseline-free crack detection technique using dual-PZTs

Yun-Kyu An, Hoon Sohn

Proceedings Volume 7647, 76473R (2010) https://doi.org/10.1117/12.847463

KEYWORDS: Ferroelectric materials, Bridges, Superposition, Structural health monitoring, Transducers, Damage detection, Waveguides, Wave propagation, Temperature metrology, Time metrology

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Proceedings Article | 1 April 2010 Paper

Guided wave generation and sensing system using a single laser source and optical fibers

Hyeonseok Lee, Hyun-Jun Park, Hoon Sohn, Il-bum Kwon

Proceedings Volume 7647, 76470R (2010) https://doi.org/10.1117/12.847807

KEYWORDS: Fiber Bragg gratings, Waveguides, Ferroelectric materials, Sensors, Tunable lasers, Transducers, Optical fibers, Photodiodes, Structural health monitoring, Modulation

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Proceedings Article | 1 April 2010 Paper

Development of a wireless power transmission system for guided wave generation and sensing via a laser

Hyun-Jun Park, Hoon Sohn, Chung-Bang Yun, Joseph Chung

Proceedings Volume 7647, 76470H (2010) https://doi.org/10.1117/12.847511

KEYWORDS: Ferroelectric materials, Waveguides, Transducers, Photodiodes, Transformers, Modulation, Semiconductor lasers, Wireless energy transfer, Sensing systems, Data transmission

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Proceedings Article | 8 April 2009 Paper

Outlier analysis and principal component analysis to detect fatigue cracks in waveguides

Piervincenzo Rizzo, Marcello Cammarata, Debaditya Dutta, Hoon Sohn

Proceedings Volume 7295, 72950S (2009) https://doi.org/10.1117/12.815512

KEYWORDS: Principal component analysis, Discrete wavelet transforms, Waveguides, Ultrasonics, Wave propagation, Structural health monitoring, Signal processing, Sensors, Wavelets, Ferroelectric materials

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Proceedings Article | 8 April 2009 Paper

Development of an optic-based guided wave excitation technique

Hyun-Jun Park, Hoon Sohn, Il-Bum Kwon, Chung-Bang Yun

Proceedings Volume 7295, 72950Y (2009) https://doi.org/10.1117/12.815830

KEYWORDS: Ferroelectric materials, Waveguides, Transducers, Photodiodes, Modulation, Transformers, Nondestructive evaluation, Optical amplifiers, Fiber lasers, Electrooptic modulators

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Proceedings Article | 8 April 2009 Paper

Frequency domain reference-free crack detection using transfer impedances in plate structures

Seunghee Park, Changgil Lee, Hoon Sohn

Proceedings Volume 7295, 72951B (2009) https://doi.org/10.1117/12.815432

KEYWORDS: Ferroelectric materials, Detection theory, Damage detection, Data conversion, Aluminum, Signal detection, Wave propagation, Structural health monitoring, Time metrology, Environmental sensing

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Proceedings Article | 30 March 2009 Paper

Application of a baseline-free damage detection technique to complex structures

Changgil Lee, Seungbum Kim, Hoon Sohn

Proceedings Volume 7292, 729221 (2009) https://doi.org/10.1117/12.815703

KEYWORDS: Ferroelectric materials, Convolution, Wave plates, Nondestructive evaluation, Damage detection, Wave propagation, Data conversion, Waveguides, Numerical simulations, Environmental sensing

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Proceedings Article | 30 March 2009 Paper

Lamb wave tuning curve calibration with improved PZT modeling

Sang Jun Lee, Hoon Sohn

Proceedings Volume 7292, 72920M (2009) https://doi.org/10.1117/12.815585

KEYWORDS: Ferroelectric materials, Calibration, Transducers, Actuators, Sensors, Numerical simulations, Waveguides, Structural health monitoring, Wave sensors, Nondestructive evaluation

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Proceedings Article | 30 March 2009 Paper

Spectral element formulation for analysis of high-frequency dynamic responses induced by surface-bonded piezoelectric transducers

Hyun Woo Park, Ki Lyong Lim, Eun Jin Kim, Hoon Sohn

Proceedings Volume 7292, 72920N (2009) https://doi.org/10.1117/12.816088

KEYWORDS: Ferroelectric materials, Chemical elements, Finite element methods, Semiconducting wafers, Wave plates, Motion models, Actuators, Wave propagation, Sensors, Transducers

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Proceedings Article | 10 April 2008 Paper

A nonlinear acoustic technique for crack detection in metallic structures

D. Dutta, H. Sohn, K. Harries, P. Rizzo

Proceedings Volume 6935, 693511 (2008) https://doi.org/10.1117/12.776360

KEYWORDS: Acoustics, Ferroelectric materials, Aluminum, Transducers, Semiconducting wafers, Beam propagation method, Nondestructive evaluation, Ultrasonics, Interference (communication), Actuators

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Proceedings Article | 10 April 2008 Paper

Instantaneous crack detection using dual PZT transducers

Seung Bum Kim, Hoon Sohn

Proceedings Volume 6935, 693509 (2008) https://doi.org/10.1117/12.775875

KEYWORDS: Ferroelectric materials, Transducers, Barium, Nondestructive evaluation, Numerical simulations, Wave plates, Waveguides, Damage detection, Aluminum, Environmental sensing

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Proceedings Article | 8 April 2008 Paper

The effect of through-the-thickness holes on a reference-free damage diagnosis technique

Changgil Lee, Seungbum Kim, Hoon Sohn

Proceedings Volume 6932, 69321U (2008) https://doi.org/10.1117/12.776600

KEYWORDS: Ferroelectric materials, Wave propagation, Wave plates, Damage detection, Time metrology, Polarization, Refraction, Nondestructive evaluation, Signal detection, Transducers

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Proceedings Article | 11 April 2007 Paper

Instantaneous crack detection under changing operational and environmental variations

Seung Bum Kim, Hoon Sohn

Proceedings Volume 6532, 653209 (2007) https://doi.org/10.1117/12.715463

KEYWORDS: Ferroelectric materials, Nondestructive evaluation, Environmental sensing, Polarization, Numerical simulations, Signal processing, Data conversion, Transducers, Waveguides, Semiconducting wafers

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Proceedings Article | 11 April 2006 Paper

Application of outlier analysis for baseline-free damage diagnosis

Seung Dae Kim, Chi Won In, Kelly Cronin, Hoon Sohn, Kent Harries

Proceedings Volume 6174, 61741H (2006) https://doi.org/10.1117/12.658285

KEYWORDS: Ferroelectric materials, Nondestructive evaluation, Active remote sensing, Waveguides, Wave propagation, Wave plates, Fiber reinforced polymers, Acoustics, Sensing systems, Optical inspection

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Proceedings Article | 11 April 2006 Paper

Development of self-contained sensor skin for highway bridge monitoring

Jieun Jang, J. Frank Liu, C. Patrick Yue, Hoon Sohn

Proceedings Volume 6174, 617441 (2006) https://doi.org/10.1117/12.659988

KEYWORDS: Sensors, Skin, Transformers, Signal generators, Active remote sensing, Inspection, Oscillators, Microsoft Foundation Class Library, Ferroelectric materials, Bridges

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This paper provides an overview and preliminary results of a newly awarded NSF project on civil structure health monitoring under CMS Sensor Program. The goal of this project is to develop the fundamental concepts, theoretical frameworks and implementation techniques for a self-contained active sensor skin in the context of highway bridge structural safety monitoring. The proposed sensor skin will be composed of (1) active sensing patches using piezoelectric materials for damage diagnosis, (2) radio frequency (RF) transceivers for wireless data transmission, and (3) embedded planar spirals for contact-less power delivery. The self-contained sensor skin will be designed such that it does not require any embedded batteries nor have any wire connection for power delivery and data transmission. Once data are retrieved at the inspection platform, an innovative damage detection algorithm will identify structural damage without replying on prior reference data. In this paper, preliminary results are presented on building a practical contact-less power delivery system and an on-chip signal generator for active sensors. A prototype of the contact-less power delivery circuit, which consists of a transformer and a AC-to-DC converter/regulator, is built using discrete circuit components. The transformer is composed of a ferrite core which is wound around by a pair of coils. One of the coils is connected to the high voltage power terminal and the other one is connected to the rectifier terminal. Then an AC-to-DC converter/regulator will provide an appropriate voltage level necessary for the operation of the on-chip signal generator. The on-chip signal generator is designed to realize a targeted inspection signal for activation of Macro Fiber Composite (MFC). The Colpitts LC-tank oscillator topology is chosen for the generation of the carrier frequency, and a low-frequency modulation signal is directly applied to the core circuit of the oscillator to finalize the predetermined inspection signal. In the future, the contact-less power delivery circuits will be integrated with the on-chip signal generator to complete the circuit designs for driving MFC.

Proceedings Article | 28 March 2006 Paper

Application of time-reversal guided waves to field bridge testing for baseline-free damage diagnosis

S. Kim, H. Sohn

Proceedings Volume 6177, 617706 (2006) https://doi.org/10.1117/12.659728

KEYWORDS: Ferroelectric materials, Bridges, Wave propagation, Nondestructive evaluation, Digital filtering, Waveguides, Acoustics, Sensors, Analog electronics, Electromagnetic coupling

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Proceedings Article | 9 May 2005 Paper

Can damage be detected without any baseline data?

Hoon Sohn, Hyun Woo Park

Proceedings Volume 5768, (2005) https://doi.org/10.1117/12.605374

KEYWORDS: Statistical analysis, Composites, Ferroelectric materials, Structural health monitoring, Sensors, Damage detection, Wave plates, Wave propagation, Acoustics, Data modeling

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Proceedings Article | 26 July 2004 Paper

Nonlinear feature identification of impedance-based structural health monitoring

Amanda Rutherford, Gyuhae Park, Hoon Sohn, Charles Farrar

Proceedings Volume 5390, (2004) https://doi.org/10.1117/12.540106

KEYWORDS: Ferroelectric materials, Structural health monitoring, Feature extraction, Sensors, Near field, Damage detection, Signal detection, Autoregressive models, Optical testing, Data acquisition

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Proceedings Article | 21 July 2004 Paper

Design of a wireless active sensing unit for structural health monitoring

Jerome Lynch, Arvind Sundararajan, Kincho Law, Hoon Sohn, Charles Farrar

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.545572

KEYWORDS: Active remote sensing, Data modeling, Active sensors, Sensors, Aluminum, Damage detection, Actuators, Structural health monitoring, Structural monitoring, Prototyping

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Proceedings Article | 21 July 2004 Paper

Plate damage identification using wave propagation and impedance methods

Jeannette Wait, Gyuhae Park, Hoon Sohn, Charles Farrar

Proceedings Volume 5394, (2004) https://doi.org/10.1117/12.540071

KEYWORDS: Ferroelectric materials, Wave propagation, Sensors, Signal attenuation, Time-frequency analysis, Aluminum, Microsoft Foundation Class Library, Structural health monitoring, Actuators, Signal processing

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Proceedings Article | 18 August 2003 Paper

Singularity detection for structural health monitoring using Holder exponents

Amy Robertson, Charles Farrar, Hoon Sohn

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.482762

KEYWORDS: Wavelets, Wavelet transforms, Earthquakes, Structural health monitoring, Signal detection, Fourier transforms, Time-frequency analysis, Detection and tracking algorithms, Feature extraction, Process control

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Proceedings Article | 18 August 2003 Paper

Field validation of a wireless structural monitoring system on the Alamosa Canyon Bridge

Jerome Lynch, Arvind Sundararajan, Kincho Law, Anne Kiremidjian, Ed Carryer, Hoon Sohn, Charles Farrar

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.482712

KEYWORDS: Bridges, Sensors, Sensing systems, Structural monitoring, Wireless communications, Microcontrollers, Data communications, Data acquisition, Prototyping, Microelectromechanical systems

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Proceedings Article | 18 August 2003 Paper

A software tool for graphically assembling damage identification algorithms

David Allen, Joshua Clough, Hoon Sohn, Charles Farrar

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.482755

KEYWORDS: Diamond, Glasses, Data modeling, Structural health monitoring, Algorithm development, Detection and tracking algorithms, MATLAB, Software development, Pattern recognition, Statistical analysis

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Proceedings Article | 18 August 2003 Paper

Application of frequency domain ARX models and extreme value statistics to damage detection

Timothy Fasel, Hoon Sohn, Charles Farrar

Proceedings Volume 5057, (2003) https://doi.org/10.1117/12.482715

KEYWORDS: Damage detection, Statistical analysis, Data modeling, Structural health monitoring, Feature extraction, Statistical modeling, Ferroelectric materials, Sensors, Complex systems, Data acquisition

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Proceedings Article | 10 July 2002 Paper

Damage detection in mechanical structures using extreme value statistics

Keith Worden, David Allen, Hoon Sohn, Charles Farrar

Proceedings Volume 4693, (2002) https://doi.org/10.1117/12.475226

KEYWORDS: Data modeling, Statistical analysis, Error analysis, Damage detection, Statistical modeling, Time metrology, Structural health monitoring, Pattern recognition, Feature extraction, Computer simulations

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Proceedings Article | 28 June 2002 Paper

Consideration of environmental and operational variability for damage diagnosis

Hoon Sohn, Keith Worden, Charles Farrar

Proceedings Volume 4696, (2002) https://doi.org/10.1117/12.472546

KEYWORDS: Neural networks, Principal component analysis, Autoregressive models, Statistical inference, Bridges, Environmental sensing, Time series analysis, Error analysis, Associative arrays, Feature extraction

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Proceedings Article | 18 June 2002 Paper

Utilizing the sequential probability ratio test for building joint monitoring

David Allen, Hoon Sohn, Keith Worden, Charles Farrar

Proceedings Volume 4704, (2002) https://doi.org/10.1117/12.470707

KEYWORDS: Statistical modeling, Statistical analysis, Autoregressive models, Statistical inference, Data modeling, Error analysis, Time series analysis, Aluminum, Damage detection, Digital signal processing

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Proceedings Article | 18 June 2002 Paper

Structural health monitoring using wireless sensing systems with embedded processing

Neal Tanner, Charles Farrar, Hoon Sohn

Proceedings Volume 4704, (2002) https://doi.org/10.1117/12.470728

KEYWORDS: Structural health monitoring, Sensors, Sensing systems, Light emitting diodes, Computer programming, Actuators, Damage detection, Data processing, Process control, Microelectromechanical systems

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Proceedings Article | 11 June 2002 Paper

Structural health monitoring system design using finite element analysis

Daniel Stinemates, Charles Farrar, Hoon Sohn, Joel Bennett

Proceedings Volume 4702, (2002) https://doi.org/10.1117/12.469876

KEYWORDS: Data modeling, Finite element methods, Structural health monitoring, Sensing systems, Modal analysis, Damage detection, Sensors, Aluminum, Motion models, Analytical research

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Proceedings Article | 30 July 2001 Paper

Novelty detection under changing environmental conditions

Hoon Sohn, Keith Worden, Charles Farrar

Proceedings Volume 4330, (2001) https://doi.org/10.1117/12.434110

KEYWORDS: Neural networks, Principal component analysis, Environmental sensing, Temperature metrology, Feature extraction, Signal detection, Associative arrays, Head, Sensors, Computer simulations

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Proceedings Article | 24 July 2001 Paper

Integrated structural health monitoring

Charles Farrar, Hoon Sohn, Michael Fugate, Jerry Czarnecki

Proceedings Volume 4335, (2001) https://doi.org/10.1117/12.434158

KEYWORDS: Structural health monitoring, Microelectromechanical systems, Sensors, Statistical analysis, Data processing, Damage detection, Actuators, Data acquisition, Feature extraction, Sensing systems

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Proceedings Article | 17 June 1998 Paper

Adaptive modeling of environmental effects in modal parameters for damage detection in civil structures

Hoon Sohn, Mark Dzwonczyk, Erik Straser, Kincho Law, Teresa Meng, Anne Kiremidjian

Proceedings Volume 3325, (1998) https://doi.org/10.1117/12.310601

KEYWORDS: Bridges, Temperature metrology, Data modeling, Statistical modeling, Damage detection, Sensors, Digital filtering, Environmental sensing, Linear filtering, Error analysis

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Proceedings Article | 17 June 1998 Paper

Application of load-dependent Ritz vectors to probabilistic damage detection

Hoon Sohn, Kincho Law

Proceedings Volume 3325, (1998) https://doi.org/10.1117/12.310603

KEYWORDS: Damage detection, Laser damage threshold, Diagnostics, Data modeling, Curium, Error analysis, 3D modeling, Data analysis, Analytical research, Actuators

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Showing 5 of 75 publications

Proceedings Volume Editor (7)

SPIE Conference Volume | 26 May 2020

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2020

SPIE Conference Volume | 9 July 2019

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019

SPIE Conference Volume | 2 July 2018

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018

SPIE Conference Volume | 9 August 2017

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017

SPIE Conference Volume | 29 July 2016

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016

Showing 5 of 7 publications

Conference Committee Involvement (37)

Health Monitoring of Structural and Biological Systems XIX

17 March 2025 | Vancouver, Canada

Health Monitoring of Structural and Biological Systems XVIII

25 March 2024 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVII

13 March 2023 | Long Beach, California, United States

Health Monitoring of Structural and Biological Systems XVI

7 March 2022 | Long Beach, California, United States

SPIE Smart Structures + Nondestructive Evaluation

22 March 2021 | Online Only, United States

Health Monitoring of Structural and Biological Systems XV

8 March 2021 | Online Only, California, United States

Health Monitoring of Structural and Biological Systems XIV

27 April 2020 | Online Only, California, United States