• Ph.D., University of Texas at Austin, 1985
  • M.Sc., University of Southampton, United Kingdom, 1982
  • Ingénieur, Université de Technologie de Compiègne, France, 1981

Research Areas and Descriptors


Dr. Berthelot came to Georgia Tech in fall 1985 as an Assistant Professor.


Matt Cornwell (B.S. Duke University, M.S. Georgia Tech) and Mike Haberman (B.S. University of Idaho, M.S. Georgia Tech) monitoring the elastic moduli of paper using noncontact generation and detection of ultrasound with lasers to control the quality of paper products during production.

Dr. Berthelot's research interests are ultrasonic nondestructive evaluation (NDE), acoustic materials, and laser-based sensors. As a violinist, he is also interested in musical acoustics. Ultrasonic nondestructive evaluation (NDE) refers to the use of ultrasound to probe a given medium and gain useful information about its interior. Dr. Berthelot's research involves the use of lasers to generate and detect ultrasound. Laser ultrasonics is particularly attractive for applications where contact with the specimens is to be avoided (e.g., moving specimen, hot surfaces). He is currently involved in a project aimed at measuring the mechanical properties of complex materials by measuring with lasers the properties of ultrasonic propagation simultaneously in time and frequency (wavelet analysis).

Structural acoustics deals with the problem of sound radiation from vibrating structures (e.g, submarine hulls, aircraft fuselage, automobile interiors, appliances). An important aspect of structural acoustics is to characterize damping of waves in complex acoustic materials. Dr. Berthelots expertise in this area is the use of laser vibrometry to measure the vibrations of complex structures and materials. He and his students have developed a new method to measure the Young and shear moduli of viscoelastic polymers with coated microinclusions that are used as coatings. The method is also used to characterize damping in rubber materials and composites of interest to the tire industry. Dr. Berthelot's interest in acoustic materials also extends to improving existing models of porous absorbing material using a causality principle.

The Integrated Acoustics Laboratory (IAL), with its state-of-the-art scanning laser vibrometer, anechoic chamber, the semi-anechoic and reverberation chambers, offer an excellent opportunity for students to be involved in a variety of exciting experimental projects in acoustics.



  • Acoustical Society of America
    • Journal of the Acoustical Society of America  Associate Editor, 2001-present
    • Atlanta Meeting General Chair, 2000
    • Fellow, 1995 (add year)
    • R. B. Lindsay Award, 1991
  • Institution of Mechanical Engineers (UK) Water Arbitration Prize (for paper authored with J. Qu and L. Jacobs), 2000
  • Woodruff School Faculty Fellow, 1992-1997
  • American Society of Mechanical Engineers/Pi Tau Sigma Gold Medal, 1991
  • National Science Foundation Presidential Young Investigator Award, 1988
  • Sigma Xi (Georgia Tech Chapter) Young Faculty Award, 1988-1992


Material Characteristic Testing Method and Apparatus Using Interferometry to Detect Ultrasonic Signals in a Web, U. S. Patent 5,814,730, with P. Brodeur and M. Johnson, September 29, 1998

Method and Apparatus for Detecting Surface Wave Vector Dynamics Using Three Beams of Coherent Light, U. S. Patent 5,477,324, with J. Jarzynski and M. Yang, December 19, 1995

Representative Publications

M. Haberman, Y. Berthelot, and M. Cherkaoui. 2006. Micromechanical Modeling of Particulate Composites for Damping of Acoustic Waves. Journal of Engineering Materials and Technology 128, 320-329.

 J. P. Chambers and Y. H. Berthelot. 2006. Utilizing a Modified Impedance Analogy On Sound Propagation Past a Hard Curved Rough Surface (L). Journal of the Acoustical Society of America 120(3), 1186-1189.

 J. Sutanto, P. J. Hesketh, and Y. H. Berthelot. 2006. Static and Dynamic Response of a Bistable-Bidirectional Electromagnetic Microactuator on a Single Silicon Substrate. Sensors and Actuators A132, 701-713.

D. Gex, Y. Berthelot, and C. Lynch. 2005. Low Frequency Bending Piezoelectric Actuator with Integrated Ultrasonic NDE Functionality.  Nondestructive Testing & E International 38(8), 627-633.

 M. Haberman, Y. H. Berthelot, and M. Cherkaoui. 2005. Transmission Loss of Viscoelastic Materials Containing Oriented Ellipsoidal, Coated Microinclusions. Journal of the Acoustical Society of America118(5), 2984-2992.