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8 April 2010 A fiber Bragg grating interrogation system for health monitoring of metals and composites
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This paper presents a novel Fiber-Bragg Grating interrogation system and its validation for detection of Lambwaves and acoustic emission events on both aluminum and composite substrates. The system utilizes a robust laser demodulation technique for FBG interrogation, based upon a simple laser wavelength tracking scheme. This technique enables detection of much higher frequency strains than previous FBG interrogation techniques, enabling the use of FBG sensors in acousto-ultrasonic structural health monitoring schemes such as Lamb-wave pitch-catch and acoustic emission detection in the presence of a quasistatic strain background. The principles of the FBG interrogation system are presented, including validation of the system for detection of ultrasonic Lamb waves, and results from a 4-point bending test of a braided composite tube wherein the FBG system was used to detect crack-growth induced AE events on the braided tube. The AE data agreed well with damage index values measured by a commercial acousto-ultrasonic system.
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An-Dien Nguyen and Alexi S. Rakow "A fiber Bragg grating interrogation system for health monitoring of metals and composites", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 764904 (8 April 2010);

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