Extremely Low Frequency (ELF) for Anti-Submarine Warfare (ASW)

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$749,652.00
Award Year:
2008
Program:
SBIR
Phase:
Phase II
Contract:
N68335-09-C-0072
Agency Tracking Number:
N072-120-0007
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
NAVMAR APPLIED SCIENCES CORP.
65 West Street Road, Building C, Warminster, PA, 18974
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
095275343
Principal Investigator:
Richard Coughlan
Principal Investigator
(215) 675-4900
coughlan@navmar.com
Business Contact:
Robert Bauder
Vice President, Director
(610) 619-7443
bauder@navmar.com
Research Institution:
n/a
Abstract
A submarine immersed in seawater behaves like a short-circuited galvanic cell which, because of variations in resistance (as a function of propeller shaft angle) between the rotating propeller shaft and its bearings, may produce an electric current that is modulated at the shaft rate. Corrosion currents arise from differences in electrical potential among the interconnected dissimilar metals on the outside of a submarine: copper (in the bronze propeller), iron (in the steel hull), and zinc (in the hull-protecting sacrificial electrodes). Generally, the largest currents flow between the propeller and the nearest zincs giving rise to a current which flows from the propeller through the submarine into the water back to the propeller. Modulation of the submarine's corrosion currents gives rise to ELF emissions. A fixed-site ELF sensor offers the relative advantages of freedom from platform and geological noise, much longer integration times, the ability to exploit the vector nature of the signature, and a much larger separation in frequency between the Extremely Low Frequency Emission (ELFE) signal and the ferromagnetic signal. During Phase 1, Navmar identified a design concept for the ELF buoy. During phase 2, design details will be refined, and units will be fabricated for concept demonstration testing.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government