Research Affiliate e-mail: ju21743 at mit dot edu or justgchen at gmail dot com |
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About Me
I am currently a technical staff member at MIT Lincoln Laboratory in the Advanced Capabilities and Technologies group. I have research interests in novel sensor systems, specifically computer vision systems for quantitative measurement of motion and laser vibrometers. I work on applying using these novel sensor systems in combination with machine learning for anomaly detection for structural health monitoring and non-destructive testing. I was a post-doctoral associate in the Department of Civil and Environmental Engineering at MIT in Prof. Oral Buyukozturk's LISS group. I worked closely with Prof. Bill Freeman's and Prof. Fredo Durand's groups in CSAIL. I received my Ph.D in Structures and Materials from the Department of Civil and Environmental Engineering at MIT in 2016, an S.M. in Civil and Environmental Engineering from MIT in 2013, and a B.S. in Physics from Caltech in 2009.
Resume (pdf)
Academic CV (pdf)
Linkedin
Research
Video Camera-based Vibration Measurement
For my doctoral thesis, I worked on developing methods for processing video camera data to make displacement measurements of structures for the purpose of identifying potential damage in civil infrastructure. As a starting point, the Motion Magnification algorithm can magnify small motions in videos in specific bands of frequencies; for structures if you choose the frequencies to coincide with resonant frequencies you can create videos of the approximate or operational mode shapes. Expanding on this, using phase based optical flow, quantitative displacements can be measured from videos and mode shapes can be identified.
Currently, in pseudo real-time we can take a video of a small structure, identify and measure its operational mode shapes, and generate motion magnified video at the identified resonant frequencies. Vibrational inspection of small structures and machinery is currently being developed.
The title of my doctoral thesis was "Video Camera-based Vibration Measurement of Infrastructure".
Screenshots from a video of a motion magnified pipe. From left to right: Source, 480 Hz, 1200 Hz, 2400 Hz.
Research Sponsor: Shell through the MIT Energy Initiative
Acoustic-Laser Vibrometry
For my Master's thesis I worked on acoustic-laser vibrometry, a technique that uses an acoustic source to excite an object and a laser vibrometer to measure its vibrational response. Specifically, I investigated it to find interfacial defects in FRP-reinforced concrete, characterized the effect of several experimental parameters on the detection performance (distance, acoustic sound level, angle of incidence, dwell time), and provided a method for identifying the aspect ratio of defects.
Diagram of the Acoustic-Laser Vibrometry method
Research Sponsor: NSF and the American Society for Non-destructive Testing
Publications
Refereed Journal and Conference Publications
- Wadhwa, N., Chen, J.G., Sellon, J.B., Wei, D., Rubinstein, M., Ghaffari, R., Freeman, D.M., Büyüköztürk, O., Wang, P., Sun, S., Kang, S.H., Bertoldi, K., Durand, F., and W.T. Freeman, (2017) "Motion microscopy for visualizing and quantifying small motions", Proceedings of the National Academy of Sciences, p.201703715. [paper]
- Justin G. Chen, and Oral Büyüköztürk, (2017) "A symmetry measure for damage detection with mode shapes", Journal of Sound and Vibration 408: pp. 123-137.
- Zoran Dzunic, Justin G. Chen, Hossein Mobahi, Oral Büyüköztürk, and John W. Fisher, (2017) "A Bayesian state-space approach for damage detection and classification", Mechanical Systems and Signal Processing 96: pp. 239-259.
- Reza Mohammadi Ghazi, Justin G. Chen, and Oral Büyüköztürk, (2017) "Pairwise graphical models for structural health monitoring with dense sensor arrays", Mechanical Systems and Signal Processing 93: pp. 578-592.
- Young-Jin Cha, Justin G. Chen, and Oral Buyukozturk, (2017) "Output only computer vision based damage detection using phase-based optical flow and unscented Kalman filters", Engineering Structures, Vol. 132, pp. 300-313. [paper]
- Neal Wadhwa, Hao-Yu Wu, Abe Davis, Michael Rubinstein, Eugene Shih, Gautham J. Mysore, Justin G. Chen, Oral Buyukozturk, John V. Guttag, William T. Freeman, and Frédo Durand, (2016) "Eulerian Video Magnification and Analysis", Communications of the ACM, Vol. 60, Iss. 1, pp. 87-95. [paper]
- Justin G. Chen, Abe Davis, Neal Wadhwa, Frédo Durand, William T. Freeman, Oral Buyukozturk, (2016), "Video Camera-based Vibration Measurement for Civil Infrastructure Applications", Journal of Infrastructure Systems, accepted. [paper]
- Abe Davis*, Katherine L. Bouman*, Justin G. Chen, Michael Rubinstein, Oral Buyukozturk, Frédo Durand, and William T. Freeman, (2016) "Visual Vibrometry: Estimating Material Properties from Small Motions in Video", IEEE Transactions on Pattern Analysis and Machine Intelligence, accepted. *Joint first author [paper]
- Abe Davis, Justin G. Chen, and Frédo Durand, (2015), "Image-Space Modal Bases for Plausible Manipulation of Objects in Video", ACM Transactions on Graphics (TOG), Vol. 34, No. 6, page 239. [paper]
- Abe Davis*, Katherine L. Bouman*, Justin G. Chen, Michael Rubinstein, Frédo Durand, and William T. Freeman, (2015), "Visual Vibrometry: Estimating Material Properties from Small Motions in Video", In Proc. IEEE Conf. on CVPR, pp. 5335-5343. *Joint first author [paper]
- Justin G. Chen, Neal Wadhwa, Young-Jin Cha, Frédo Durand, William T. Freeman, Oral Buyukozturk, (2015), "Modal identification of simple structures with high-speed video using motion magnification", Journal of Sound and Vibration, Vol. 345, June 2015, pages 58-71. [paper]
- Justin G. Chen, Robert W. Haupt, Oral Buyukozturk, (2015) "Operational and defect parameters concerning the acoustic-laser vibrometry method for FRP-reinforced concrete", NDT & E International, Vol. 71, April 2015, pages 43-53. [paper]
- Justin G. Chen, Robert W. Haupt, Oral Buyukozturk, (2014), "The Acoustic-laser Vibrometry Technique for the Noncontact Detection of Discontinuities in Fiber Reinforced Polymer-retrofitted Concrete," Materials evaluation, Vol. 62, no. 10, 204, pages 1305-1313. [paper]
- Leaf A. Jiang, Marius A. Albota, Robert W. Haupt, Justin G. Chen, and Richard M. Marino, (2011), "Laser vibrometry from a moving ground vehicle," Applied optics, Vol. 50, Iss. 15, pages 2263-2273. [paper]
Conference Proceedings
- Justin G. Chen, Murat Uzun, Thee Ngamsangrat, and Oral Buyukozturk, "Smaller than the eye can see: Selected applications of video-based measurement", 11th International Workshop on Structural Health Monitoring (IWSHM 2017), Stanford, CA, Sept. 12-14, 2017, (presenter).
- Abe Davis, Justin G. Chen, Oral Buyukozturk, Frédo Durand, and Doug L. James, "Structural health monitoring from the window seat of a passenger airplane", 11th International Workshop on Structural Health Monitoring (IWSHM 2017), Stanford, CA, Sept. 12-14, 2017.
- Justin G. Chen, Murat Uzun, Neal Wadhwa, Abe Davis, Frédo Durand, William T. Freeman, and Oral Buyukozturk, "Motion magnification based damage detection using high speed video", Engineering Mechanics Institute Conference 2017, San Diego, CA, June 4-7, 2017, (presenter).
- Oral Buyukozturk, Justin G. Chen, Neal Wadhwa, Abe Davis, Frédo Durand, and William T. Freeman, "Smaller Than the Eye Can See: Vibration Analysis with Video Cameras", 19th World Conference on Non-Destructive Testing 2016 (WCNDT), Munich, Germany, June 13-17, 2016 (presenter). [paper]
- Justin G. Chen, Abe Davis, Neal Wadhwa, Frédo Durand, William T. Freeman, and Oral Buyukozturk, "Video Camera-based Vibration Measurement for Condition Assessment of Civil Infrastructure", International Symposium Non-destructive Testing in Civil Engineering (NDT-CE 2015), Berlin, Germany, Sept. 15-17, 2015 (presenter). [paper]
- Justin G. Chen, Neal Wadhwa, Abe Davis, Frédo Durand, William T. Freeman, and Oral Buyukozturk, "Long Distance Video Camera Measurements Of Structures", 10th International Workshop on Structural Health Monitoring (IWSHM 2015), Stanford, California, Sept. 1-3, 2015. [paper]
- Justin G. Chen, Neal Wadhwa, Frédo Durand, William T. Freeman, and Oral Buyukozturk, "Motion Magnification for Structural Modal Identification through Camera Video", IMAC XXXIII, Orlando, Florida, Feb. 2 - 5, 2015 (presenter). [paper]
- Zoran Dzunic, Justin G. Chen, Hossein Mobahi, Oral Buyukozturk, and John Fisher III, "A Bayesian State-space Approach for Damage Detection and Classification", IMAC XXXIII, Orlando, Florida, Feb. 2 - 5, 2015. [paper]
- Oral Buyukozturk, Justin G. Chen, Timothy J. Emge II, Robert W. Haupt, “Acoustic-Laser Vibrometry for Standoff Detection of Defects in Materials”, ECNDT, Prague, Czech Republic, Oct. 6 - 10, 2014 (presenter). [paper]
- Oral Buyukozturk, James Long, Reza Mohammadi Ghazi, Young-Jin Cha, Justin. G. Chen, Dirk Smit, "Structural Health Monitoring: A Quest Towards the Use of Combined Approaches", EWSHM, Nantes, France, July 8 - 11, 2014. [paper]
- Justin G. Chen, Neal Wadhwa, Young-Jin Cha, Frédo Durand, William T. Freeman, and Oral Buyukozturk, "Structural Modal Identification Through High Speed Camera Video: Motion Magnification", IMAC XXXII, Orlando, Florida, Feb. 3 - 6, 2014 (presenter). [paper]
- Brianna Klingensmith, Stephen R. Burgess, Thomas A. Campbell, Peter G. Sherman, Michael Y. Feng, Justin G. Chen, and Oral Buyukozturk, "Modular System for High-Speed 24-Bit Data Acquisition of Triaxial MEMS Accelerometers for Structural Health Monitoring Research", IMAC XXXII, Orlando, Florida, Feb. 3 - 6, 2014. [paper]
- Justin G. Chen, Robert W. Haupt, and Oral Buyukozturk, “Remote Characterization of Defects in FRP strengthened Concrete using the Acoustic-Laser Vibrometry Method,” ASNT 2013 Fall Conference, Las Vegas, Nevada, Nov. 4 - 7, 2013 (presenter). [paper]
- Justin G. Chen, Robert W. Haupt, and Oral Buyukozturk, “A Novel Method for the Remote Detection of Debonding in FRP-strengthened Concrete: Acoustic-Laser Vibrometry”, ASNT 2012 Fall Conference, Orlando, Florida, Oct. 29 - Nov. 1, 2012 (presenter). [paper]
- Oral Buyukozturk, Robert Haupt, Chakrapan Tuakta, and Justin Chen, “Remote Detection of Debonding in FRP-strengthened Concrete Structures using Acoustic-Laser Technique”, NDTMS, Istanbul, Turkey, May 15-18, 2011. [paper]
- Adrian P. Galvan, Brad Filippone, Justin Chen, and Brad Plaster, "Measurement of the uniformity of a 1/2 scale prototype magnet for the SNS neutron electric dipole moment experiment."APS Meeting Abstracts. Vol. 1. 2009.
Publicity
MIT News - 8/2/2016 - Reach in and touch objects in videos with "Interactive Dynamic Video"
ENR - 12/3/2015 - High-Speed Video System Tested for Structure Monitoring
MIT News - 8/27/2015 - Observing invisible vibrations
MIT News - 5/21/2015 - Gauging materials' physical properties from video
The Wall Street Journal - 5/15/2015 - Monitoring Tiny Vibrations to Avert Big Problems
MIT News - 4/23/2015 - Magnifying vibrations in bridges and buildings (youtube video)
Misc.
I autocross with Renegade Miata, Boston BMWCCA, NER SCCA, NCR PCA, and many other clubs at Autocross Moore Army Airfield in Ayer, MA. I instruct and assist with course design at Renegade Miata, BMWCCA, NER PCA, and NCR PCA. I am also a member of the amateur motorsports team PROJECT.Devens.
