Low-cost, low frequency slotted cylinder transducer

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-07-M-0459
Agency Tracking Number: N074-035-0174
Amount: $69,949.00
Phase: Phase I
Program: STTR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: N07-T035
Solicitation Number: N/A
Small Business Information
2500 N. Loop Drive, Ames, IA, 50010
DUNS: 798683355
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Julie Slaughter
 Senior Design Engineer
 (515) 296-8030
 julie.slaughter@etrema.com
Business Contact
 Jonathan Snodgrass
Title: Executive Vice President
Phone: (515) 296-8030
Email: jon.snodgrass@etrema.com
Research Institution
 APPLIED RESEARCH LABORATORY AT THE
 Charles Allen
 P.O. Box 30
State College, PA, 16804
 (814) 863-4430
 Nonprofit college or university
Abstract
Current ASW missions require low frequency off-board sound sources that can operate monostatically or bistatically. Since these sources may or may not be recoverable, and may require a substantial number to cover the designated operating areas, the low frequency source transducers also need to be low cost. The team of Etrema Products and Applied Research Laboratory at The Pennsylvania State University (ARL Penn State) propose using magnetostrictive Galfenol, an iron-gallium alloy, in low frequency transducer devices to produce compact, high acoustic performance transducers at relatively low production costs. Galfenol is uniquely suited for use in low frequency transducers because of its formability, relatively high tensile strength, and relatively high magnetic permeability all of which allow the use of complex shapes to drive transducers. Two Galfenol spring transducer concepts will be investigated: a slotted cylinder transducer with a Gaflenol spring instead of a piezoceramic driver, and a simple double or four headed piston with Galfenol spring drivers. Both these concepts are potentially low-cost, high performance transducer that can reach source levels in excess of 210 dB, resonant frequency less than 1 kHz, and bandwidth greater than 200 Hz.

* Information listed above is at the time of submission. *

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