Oceanography Chair’s Seminar Series

SPEAKER Prof. Ben Reeder

Assistant Professor – Dept. of Oceanography, NPS

TITLE: Acoustic scattering by individual irregular finite objects

DATE: WEDNESDAY APRIL 28, 2004

TIME: 12:00 NOON

PLACE: Spanagel Hall, Rm 316

ABSTRACT:

The complexities of acoustic scattering by finite bodies in general and by fish in particular will be presented, including the development of an advanced acoustic scattering model and detailed laboratory acoustic measurements.  The scattering model is general in nature and is valid for a wide range of frequencies, angles of orientation, irregular axisymmetric shapes and boundary conditions.  The measurements were conducted on live alewife fish (Alosa pseudoharengus), using a broadband (40-95 kHz) chirp.  Modeling and data analysis tools include pulse compression processing and imaging technologies.  Studies such as this one, which combine scattering models with high-resolution morphological information and laboratory data, are crucial to the quantitative use of acoustics in the ocean.

ABOUT THE SPEAKER D. Benjamin Reeder received the B.S. degree in physics from Clemson University, Clemson, SC in 1988 and the Ph.D. degree in oceanographic engineering from the Massachusetts Institute of Technology / Woods Hole Oceanographic Institution (MIT/WHOI) Joint Program in 2002. His graduate research involved underwater acoustic scattering theory and experimentation, with Dr. Timothy K. Stanton as advisor. He served as a nuclear engineering officer on USS Tecumseh (SSBN-628), USS George Washington Carver (SSBN-656) and USS Ulysses S. Grant (SSBN-631), and qualified as a submarine warfare officer in 1991 and as a naval nuclear engineer in 1992. He also served as staff oceanographer at Naval Submarine Group Nine, Bangor, WA and the Naval Pacific Meteorology and Oceanography Center West / Joint Typhoon Warning Center, Guam. After receiving his PhD, he was the METOC officer aboard USS Tarawa (LHA-1), deploying to the Arabian Gulf during Operation Iraqi Freedom.