Geoffrey Edelmann

Applied Ocean Science, 0238 Phone: (858) 822-1775
 
Scripps Institution of Oceanography,
University of California San Diego
9500 Gilman Drive, La Jolla, CA  92093-0238		 E-mail: geoff@mpl.ucsd.edu

Education
Scripps Institution of Oceanography Expected 2002-3
Ph.D., Oceanography  
 
University of California, San Diego  June 1997
B.S., Physics, Summa Cum Laude, Phi Beta Kappa,
Malmberg award for experimental physics.		  

Qualifications

Research Interests: Acoustic Communications, Telemetry, Time Reversal, MFP, Geoacoustic Inversion.
Thesis Topic:  Acoustic Communications Using Time Reversal

Research Experience

Scripps Institution of Oceanography  1997-present  
Research Assistant  - Professor William Hodgkiss
Research in shallow water waveguides which can yield extremely complex acoustic propagation effects at high frequencies (> 1 kHz). From a communications standpoint, extended duration multipath results in serious intersymbol interference. Sophisticated adaptive channel equalization algorithms typically are used to minimize the effects of the multipath. As part of the 1999 and 2000 experiments, initial tests were conducted to explore the use of phase conjugation or time reversal to enable the ocean itself to act as its own channel equalization filter. PSK communication sequences were created using time reversal and retransmitted through the waveguide, the bits were compressed nicely back to their original duration and decoding the polarity to extract the information sequence was done easily.
 
Laboratoire Ondes et Acoustique in Paris, France 1998  
I performed two experiments: to probe the limits of frequency shifting in a wave guide and to the possibility of changing focus depth in free space, using frequency shifting. The later lead to new theoretical considerations that improved our understanding of time reversal.    
 
University of California, San Diego 1995-1997  
Undergraduate Research  - Professor Brian Maple
Measured superconductivity of Yittrium doped Uranium compounds. This material exhibits many phase changes and vortex lattice-like structure.		    

Publications/Papers

Spatial resolution of time-reversal arrays in shallow water. JASA, 2001 submitted and accepted. PDF  
 
Low and high frequency ocean acoustic phase conjugation experiments. European Conference on Underwater Acoustics, 2000. PDF, PS  

Teaching Experience

University of California, San Diego  1997  
Teaching Assistant 
Taught Physics 1C an introductory course in electromagnetics. 		  

Awards

U.C. Regents Graduate Fellowship  1997-1998
Malmberg Award for Experimental Physics  1997

Other Activities

Student Web Page of Ocean Acoustic Library 2000-present
Student Council of the Acoustical Society of America. 2001-present

Personal

Date of Birth:  September 30, 1975
Citizenship:  United States of America
 
 
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