Invited by Prof. WANG Wen and Prof. ZHANG Bixing, Prof. Omar Elmazria from the University of Lorraine and Prof. DONG Hefeng from the Norwegian University of Science and Technology visited the Institute of Acoustics, Chinese Academy of Sciences, and made two wonderful lectures on Aug. 7.
Applied by the Science and Technology Department of IACAS to CAS in 2011, Prof. Omar joined the “Chinese Academy of Sciences Visiting Professorship for Senior International Scientists”. Afterwards, Omar carried out two-month collaborative research work on surface acoustic wave (SAW) based sensors in the Acoustic Micro-Electro-Mechanical Laboratory of IACAS from Jul. 19 of 2012.
Omar gave the lecture titled “Wireless and passive SAW sensors for application in harsh environments”, in which, Omar introduced the excellent frequency characteristics of SAW sensors as well as its another feature of low-cost mass production. Omar explained theoretical researches and processing techniques of layered SAW sensors based on diamond, sapphire, AlN and ZnO materials. Meanwhile, he showed the wireless SAW sensor in the very high temperature (over 1000oC) environment, verifying the reliability and stability of the wireless and passive SAW sensors for application in harsh environments.
After Omar, DONG Hefeng, professor of Norwegian University of Science and Technology shared her lecture of “Estimation of shear-velocity profiles using shear source data in marine environment” to explore the detection of seabed sediment layer. Using the shear wave sound source signal, a series of studies were performed on the guided-wave multi-modal extraction and analysis; meanwhile, innovative progress was obtained on the seabed shear wave velocity profile inversion. Moreover, deep researches on Rayleigh waves and Love waves information inversion of the sedimentary anisotropy were developed, and shear wave splitting phenomenon was analyzed logically, which is meaningful to obtain the seabed sediment parameters.
Prof. Omar Elmazria works as a professor in the University of Lorraine and Nancy Université – CNRS and also a member of the IUF (Institut Univérsitaire de France) from 2008 and member of Technical Program Committee of several international conferences. He is actually the head of Micro and Nanosystems group within the Institut Jean Lamour (IJL). Omar is the author and co-author of more than 100 papers in the refereed international conferences and journals and was awarded as the “Institut Universitaire de France” by the Ministry of Higher Education, France.
Prof. DONG Hefeng works in the Norwegian University of Science and Technology as postdoctoral researcher, and from June 2001 to November 2002, she was research scientist at SINTEF Petroleum Research. Her current researches include: acoustic field simulation; acoustic inversion and signal processing; multi-component seismic data processing; and method of finite difference, the transmission matrix, ray tracing, finite element, etc. She is the author and co-author of dozens of papers in the refereed international journal and conferences.
Omar Elmazria is lecturing
DONG Hefeng is giving her lecture