Marine and Physical Acoustics Division Overview
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1 Marine and Physical Acoustics Division Overview David L. Bradley 30 April 2013 Center for Acoustics and Vibration
2 ORGANIZATION AND STAFFING Acoustics Division Ocean Acoustics Department Marine Bioacoustics Department Physical Acoustics Department 8 Research Faculty (Ph.D.) 5 Office Administrators 4 Research Scientist & Assists. 8 Graduate and 1 Undergraduate Students
3 ACOUSTICS DIVISION How we function 9 Faculty Researchers (Ph.D.) joint faculty Graduate Program of Acoustics 1 Research Scientist (Ph.D.) 2 Research Asst (M.S.) 5 Office Administrator 8 Graduate and 1 Undergrad Students Primary: Individual researchers, PI s for sponsor direct funded programs Secondary: Often combine in 1-3 person teams for joint proposals/tasks frequently, team with external colleagues for similar, larger tasks
4 ACOUSTICS DIVISION Acoustics Research Areas/Core Competencies ($4M) Ocean Acoustics Seafloor characterization ONR, NSF, SPAWAR Water column characterization ONR Acoustic modeling and simulation ONR Underwater threat neutralization ONR, NUWC Weapon Countermeasures ONR Ocean array experiments ONR, NRL Radiated/self noise ONR, NAWC Marine Bioacoustics Marine mammal/fish studies ONR, Woods Hole Oceanographic Institution Joint Industry Program on the Effects of Industry Sounds on Marine Animals, Int l Oil and Gas Ambient Noise Physical Acoustics Atmospheric infrasonic monitoring arrays Univ. of Miss. (Army) Thermoacoustics ONR, DoE
5 International Ocean Acoustics - At-Sea Experiments Change Detection and Seafloor Complexity Experiment, HU Sverdrup II Larvik, Norway, 2011 (student: Derek Olson) The ONR FIVE OCTAVE RESEARCH AMiCa-10 (Autonomous Mine Clearance), 2010, Italy ARRAY (FORA) at Penn State (student: Dan Brown) Clutter09 April June 2009, Italy QPE Geoacoustic Uncertainty, June/August 2009, Taiwan TAVEX, 2008, Korea (student: Chad Smith) Clutter07 May-June 2007, Italy Philippine Sea Eng Test 2009 (students: Colin Jemmott, Alex Sell) Boundary 04, May 2004, Italy (student: Tom Weber) National Bering Sea, Acoustic Moorings, 2008-Present (student: Sam Denes) TREX13, May 2013, Panama City, FL Gulf-Ex, Active Sonar Reverberation, May 2012, Panama City, FL Long Range Acoustic Comms Sept 2010, Off San Diego SW06, 2006, New Jersey Shelf (students: Megan Ballard, Joy Lyons, John Camin, Tom Weber) Gulf of Maine Sept 2006, Georges Bank 2006: Scattering Statistics Study, Seneca Lake OREX05, July 2006, Oregon coast CTD Chain
6 ACOUSTICS DIVISION International Collaboration In addition to PSU and other US Academic & Lab ties, the Division maintains ongoing collaborative efforts internationally: Australia Visiting Scientist AUV G&C Studies Canada Visiting Scientists Geophysical Inversion/ Modeling Germany Visiting Scientist Signal Processing Denmark Visiting Scientist, at-sea exp. Harbor Defense, SAS New Zealand Visiting Scientist Synth. Apert. Sonar (SAS) NURC (NATO Undersea Research Centre) Exchange Scientists, at-sea exp. S/W Propagation, reverberation AUV Studies, Seafloor Scattering Korea At-sea Experiments Shallow Water Propagation France Visiting scientist/students Seafloor Characterization
7 The Division National Ties
8 Characterizing Acoustic Backscatter in the Bering Sea during a Temporary Ice Retreat February 17 March 4 March 11 March 20 St. Matthew Island St. Matthew Island St. Matthew Island St. Matthew Island
9 Ice and Marine Mammals Percent Cover (%) Ice Thickness (cm) Bowhead presence Walrus presence Bearded seal presence Ribbon seal presence Year Day 2009
10 Seabed Structure at the Meso-scale AUV Results expected to shed light on reverberation and clutter in bottom-limited areas Design: ARL-PSU/NURC Built: NURC with Un. Victoria Sources: Hz Hz xducers in flooded towbody Receiver 1m spacing, 32 phones, first phone ~10 aft of source
11 Fairbanks, Support AK Army s Comprehensive Test Ban Treaty Monitoring Stations Completed: July 2009 INFRASONICS Infrasound Monitoring Station Calibrations: Sites Completed: May 2009 Newport, WA Winnipeg, MB Scheduled: September 2009 TBG
12 TBG Infrasound Monitoring Station Calibrations: Portable Wind-Noise Reduction Array
13 OCEAN ENVIRONMENT CHARACTERIZATION Synthetic Aperture SONAR Forward Modeling and Inversion 2D to 3D Synthetic Aperture Sonar Knowledge of how scattering strength varies as a function of angle allows one to go from a Synthetic Aperture SONAR intensity image to a seafloor height map Height (m) Distance (m)
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