05 Mar

Speaker: Dr. Karim Sabra

Join us next Tuesday for our 2nd ASA spring 2013 lecture! The speaker will be ME professor Dr. Karim Sabra. Below is a brief description of the lecture topic and his past experience in acoustics.

Update 3/11/2013: There has been a change in the lecture topic. Please see below for information about the new topic.

High-frequency SONAR imaging fundamentals

SONAR is an acronym for SOund Navigation And Ranging. The basic principle of sonar is to use sound to detect or locate objects, typically in the ocean. Sonar technology is similar to other technologies such as: RADAR (RAdio Detection And Ranging); ultrasound, which typically uses higher frequencies for medical applications; and seismic processing, which typically uses lower frequencies in sediments. The principle of Synthetic aperture sonar (SAS) is to combine successive pings coherently along a known track in order to increase the azimuth (along-track) resolution. SAS has the potential to produce high resolution images down to centimeter resolution up to hundreds of meters range. I will present the physical principles and signal processing underlaying SAS. Several examples will be introduced to show that SAS a suitable technique for imaging of the seafloor for applications such as search for small objects, imaging of wrecks, underwater archaeology and pipeline inspection

Date: Tuesday, March 12th, 2013
Time: 11:00 am
Location: Love Bldg. Rm 109

Karim Sabra is currently an Associate Professor of Mechanical Engineering at the Georgia Institute of Technology. Prof. Sabra joined the Georgia Institute of Technology in July 2007. Prior to this he was a Project Scientist (for 2 years) and Postdoctoral researcher (for 2 years) at the Marine Physical Laboratory of the Scripps Institute of Oceanography at the University of California at San Diego. Prof. Sabra graduated with his PhD in Mechanical Engineering in 2003 from the University of Michigan at Ann Arbor, completing his PhD studies in 3 years. Prof. Sabra teaches and performs research on acoustic and elastic wave propagation. Dr. Sabra’s awards include election as a Fellow of the Acoustical Society of America in 2007, the 2009 A.B. Wood medal from the Institute of Acoustics (UK) for his significant contributions to the field of underwater acoustics and the 2011 R.B. Lindsay award from the Acoustical Society of America for significant contribution to time-reversal and ambient noise correlations.