Technical Seminar on Defect Detection using Acoustic-Laser Technique

Date, time & venue
2019-09-16;6:00 pm – 6:30 pm (Refreshment), 6:30 pm – 7:30 pm (Talk);James Chiu & Dragages Rooms – 9/F


Speakers: Ir Dr Denvid Lau, Department of Architecture and Civil Engineering, City University of Hong Kong



Mechanical and electromagnetic waves are commonly used for material evaluation in civil infrastructure and it is envisioned that the combination of using both types of waves would be the direction for monitoring the health of the construction materials in the near future. This seminar summarizes the fundamentals and the development of using these two types of wave for nondestructive testing (NDT). Typical mechanical-wave-based NDT methods such as acoustic emission and ultrasonic technologies are reviewed. In addition, NDT methods using electromagnetic waves, which include infrared, radar, laser and X-ray are discussed. Advantages and disadvantages of these methods are outlined. In particular, we focus on a recent NDT method, which is called acoustic-laser technique as it utilizes both the mechanical and electromagnetic waves. The basic principles and some important experimental data recorded by the acoustic-laser technique are described. The future development of the acoustic-laser technique in the field of defect detection in civil infrastructure is described as well.


About the Speaker:

Denvid obtained his Bachelor degree with first class honors and Master degree in Civil Engineering from the University of Hong Kong (HKU) in 2004 and 2006 respectively, and got his second Master degree from the Department of Civil and Environmental Engineering (CEE) at Massachusetts Institute of Technology (MIT) in 2009. He then received his Ph.D. in the field of structures and materials from MIT in 2012. Prior to joining the City University of Hong Kong (CityU) as an assistant professor in August 2012, he worked as a postdoctoral associate at MIT. Currently, he is an associate professor with tenure at CityU. His research focuses on the multiscale modeling of organic-inorganic system, moisture-induced debonding, durability of concrete-epoxy system and fiber-reinforced polymer (FRP) composites in structural rehabilitation. To date, Denvid has attracted over HK$10 million fund in total for research and teaching development. He is currently the editorial board member of several international journals. He has published more than 100 referred journal and conference articles and has delivered more than 30 invited talks, which include plenary and keynote speeches in international conferences, around the world. Recently, Denvid has been nominated and selected as a Founding Member of the Young Academy of Sciences of Hong Kong (YASHK), and has received one of The President’s Awards from the CityU, in recognition of his remarkable academic achievement. In addition, Denvid has received the Certificate of Merit for the Hong Kong Institution of Engineers (HKIE) Young Engineer Award 2018 in appreciation of his effort and dedication to the engineering profession, and the Commendation Merit Award – R&D Award of Structural Excellence Award 2018, which is presented by the HKIE (Structural Division).


No registration is required.

For enquiries, please contact Ir Dr Simon Wong at 21761412


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CPD certificates will be issued.


Submissions for the Best Reporter Award are invited. Report must be submitted to within two weeks after the seminar. The rules of the Best Reporter Award could be referred to the following link:


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