Acoustic Emission Detection Using Fiber Bragg Gratings and Fast Signal Processing

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00421-02-C-3082
Agency Tracking Number: O012-0056
Amount: $99,999.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Nanosonic, Inc.
P.O. Box 618, Christiansburg, VA, 24068
Duns: 008963758
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Kristie Cooper
 Research Scientist
 (540) 953-1785
Business Contact
 Richard Claus
Title: President
Phone: (540) 953-1785
Research Institution
"The proposed program would develop high-speed optical fiber Bragg grating sensors and signal processing methods for the near real-time detection of acoustic emission events and associated material damage in advanced aircraft structures. Acoustic emissionis associated with the occurrence and accumulation of microstructural damage in materials. By detecting the amplitude and frequency characteristics of such pulsed ultrasonic stress waves it is possible to determine when structural components are loaded tonew maximum levels of stress, and to anticipate the onset of material failure. Optical fiber Bragg grating-based sensors offer a means of implementing networks of acoustic emission sensor elements on large structures such as aircraft. The proposedprogram would develop near real-time signal processing systems for such sensors, to enable high frequency response to acoustic emission, and thus the ability to characterize damage mechanism sources and pre-failure events. NanoSonic Inc. would work withthe Fiber & Electro-Optics Research Center on campus at Virginia Tech on this program through a small subcontract. University researchers at FEORC were among the first to demonstrate the detection of acoustic emission using fiber sensors and systems inthe 1970s and 1980s, and to quantitatively compare fiber sensors and conventional 2.25 MHz acoustic emission piezoelectric transducers. Acoustic emission (AE) is an important tool used for t

* information listed above is at the time of submission.

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