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Proceedings Paper

Multipoint dynamically reconfigure adaptive distributed fiber optic acoustic emission sensor (FAESense) system for condition based maintenance
Author(s): Edgar Mendoza; John Prohaska; Connie Kempen; Yan Esterkin; Sunjian Sun; Sridhar Krishnaswamy
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Paper Abstract

This paper describes preliminary results obtained under a Navy SBIR contract by Redondo Optics Inc. (ROI), in collaboration with Northwestern University towards the development and demonstration of a next generation, stand-alone and fully integrated, dynamically reconfigurable, adaptive fiber optic acoustic emission sensor (FAESense™) system for the in-situ unattended detection and localization of shock events, impact damage, cracks, voids, and delaminations in new and aging critical infrastructures found in ships, submarines, aircraft, and in next generation weapon systems. ROI's FAESense™ system is based on the integration of proven state-of-the-art technologies: 1) distributed array of in-line fiber Bragg gratings (FBGs) sensors sensitive to strain, vibration, and acoustic emissions, 2) adaptive spectral demodulation of FBG sensor dynamic signals using two-wave mixing interferometry on photorefractive semiconductors, and 3) integration of all the sensor system passive and active optoelectronic components within a 0.5-cm x 1-cm photonic integrated circuit microchip. The adaptive TWM demodulation methodology allows the measurement of dynamic high frequnency acoustic emission events, while compensating for passive quasi-static strain and temperature drifts. It features a compact, low power, environmentally robust 1-inch x 1-inch x 4-inch small form factor (SFF) package with no moving parts. The FAESense™ interrogation system is microprocessor-controlled using high data rate signal processing electronics for the FBG sensors calibration, temperature compensation and the detection and analysis of acoustic emission signals. Its miniaturized package, low power operation, state-of-the-art data communications, and low cost makes it a very attractive solution for a large number of applications in naval and maritime industries, aerospace, civil structures, the oil and chemical industry, and for homeland security applications.

Paper Details

Date Published: 9 September 2010
PDF: 4 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 765343 (9 September 2010); doi: 10.1117/12.868139
Show Author Affiliations
Edgar Mendoza, Redondo Optics, Inc. (United States)
John Prohaska, Redondo Optics, Inc. (United States)
Connie Kempen, Redondo Optics, Inc. (United States)
Yan Esterkin, Redondo Optics, Inc. (United States)
Sunjian Sun, Redondo Optics, Inc. (United States)
Sridhar Krishnaswamy, Northwestern Univ. (United States)


Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors

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