Acoustic Emission Sensor for Spacecraft Applications

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNL04AA16C
Agency Tracking Number: 022855
Amount: $599,999.00
Phase: Phase II
Program: SBIR
Awards Year: 2004
Solicitation Year: 2002
Solicitation Topic Code: H5.03
Solicitation Number: N/A
Small Business Information
67 East Evelyn Avenue, Suite 3, Mountain View, CA, 94041-1518
DUNS: 928805761
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 An-Dien Nguyen
 Principal Investigator
 (650) 965-3459
Business Contact
 Anthony OKeefe
Title: President
Phone: (650) 965-7772
Research Institution
Los Gatos Research proposes to develop a new Bragg grating-based acoustic emission (AE) sensor technology consisting of optical fibers, integrated optical waveguides, and an on-chip optical demodulation device system. Compared with conventional optical fiber based sensor systems, our technology offers substantially higher sensitivity. We achieve this by combining the mature Bragg grating technology with the inherently high sensitivity of polymer waveguides to stress waves. Using a hybrid silica/polymer Bragg grating multiplexing scheme, the sensor system is capable of simultaneously measuring temperature and strain/stress. By integrating optical waveguide filters and couplers with the Bragg grating array sensor, the sensor system offers increased dynamic range for simultaneous detection of both the high and low energy AE signals arisen during impact or crack formation. The Phase I research has demonstrated the feasibility of the integrated polymer waveguide and Bragg grating fabrication technology and the use of Bragg gratings for static and dynamic stress sensing. In the Phase II research effort, the polymer waveguide and Bragg grating designs will be further optimized. Hybrid polymer/silica Bragg grating array and an on-chip wavelength filter demodulation prototype system will be developed for temperature, stress/strain, and AE detection and location measurements.

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

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