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Proceedings Paper

Combined electromechanical impedance and fiber optic diagnosis of aerospace structures
Author(s): Jon Schlavin; Andrei Zagrai; Rebecca Clemens; Richard J. Black; Joey Costa; Behzad Moslehi; Ronak Patel; Vahid Sotoudeh; Fereydoun Faridian
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Paper Abstract

Electromechanical impedance is a popular diagnostic method for assessing structural conditions at high frequencies. It has been utilized, and shown utility, in aeronautic, space, naval, civil, mechanical, and other types of structures. By contrast, fiber optic sensing initially found its niche in static strain measurement and low frequency structural dynamic testing. Any low frequency limitations of the fiber optic sensing, however, are mainly governed by its hardware elements. As hardware improves, so does the bandwidth (frequency range * number of sensors) provided by the appropriate enabling fiber optic sensor interrogation system. In this contribution we demonstrate simultaneous high frequency measurements using fiber optic and electromechanical impedance structural health monitoring technologies. A laboratory specimen imitating an aircraft wing structure, incorporating surfaces with adjustable boundary conditions, was instrumented with piezoelectric and fiber optic sensors. Experiments were conducted at different structural boundary conditions associated with deterioration of structural health. High frequency dynamic responses were collected at multiple locations on a laboratory wing specimen and conclusions were drawn about correspondence between structural damage and dynamic signatures as well as correlation between electromechanical impedance and fiber optic sensors spectra. Theoretical investigation of the effect of boundary conditions on electromechanical impedance spectra is presented and connection to low frequency structural dynamics is suggested. It is envisioned that acquisition of high frequency structural dynamic responses with multiple fiber optic sensors may open new diagnostic capabilities for fiber optic sensing technologies.

Paper Details

Date Published: 28 March 2014
PDF: 13 pages
Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 90640X (28 March 2014); doi: 10.1117/12.2046620
Show Author Affiliations
Jon Schlavin, New Mexico Institute of Mining and Technology (United States)
Andrei Zagrai, New Mexico Institute of Mining and Technology (United States)
Rebecca Clemens, New Mexico Institute of Mining and Technology (United States)
Richard J. Black, Intelligent Fiber Optic Systems Corp. (United States)
Joey Costa, Intelligent Fiber Optic Systems Corp. (United States)
Behzad Moslehi, Intelligent Fiber Optic Systems Corp. (United States)
Ronak Patel, Intelligent Fiber Optic Systems Corp. (United States)
Vahid Sotoudeh, Intelligent Fiber Optic Systems Corp. (United States)
Fereydoun Faridian, Intelligent Fiber Optic Systems Corp. (United States)


Published in SPIE Proceedings Vol. 9064:
Health Monitoring of Structural and Biological Systems 2014
Tribikram Kundu, Editor(s)

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