Prof. Ignacio F. Gonzalez Profile

Prof. Ignacio F. Gonzalez

at Univ Politecnica de Madrid

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Proceedings Article | 17 May 2005 Paper

High speed hybrid active system

Ignacio Gonzalez, Fu-Kuo Chang, Peter Qing, Amrita Kumar, David Zhang

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.601476

KEYWORDS: Sensors, Actuators, Fiber optics sensors, Diagnostics, Fiber Bragg gratings, Ferroelectric materials, Aluminum, Optical filters, Aerospace engineering, Ultrasonics

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A novel piezoelectric/fiber-optic system is developed for long-term health monitoring of aerospace vehicles and structures. The hybrid diagnostic system uses the piezoelectric actuators to input a controlled excitation to the structure and the fiber optic sensors to capture the corresponding structural response. The aim of the system is to detect changes in structures such as those found in aerospace applications (damage, cracks, aging, etc.). This system involves the use of fiber Bragg gratings, which may be either bonded to the surface of the material or embedded within it in order to detect the linear strain component produced by the excitation waves generate by an arbitrary waveform generator. Interrogation of the Bragg gratings is carried out using a high speed fiber grating demodulation unit and a high speed data acquisition card to provide actuation input. With data collection and information processing; is able to determine the condition of the structure. The demands on a system suitable for detecting ultrasonic acoustic waves are different than for the more common strain and temperature systems. On the one hand, the frequency is much higher, with typical values for ultrasonic frequencies used in non-destructive testing ranging from 100 kHz up to several MHz. On the other hand, the related strain levels are much lower, normally in the μstrain range. Fiber-optic solutions for this problem do exist and are particularly attractive for ultrasonic sensing as the sensors offer broadband detection capability.

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