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Proceedings Paper

Airplane structure health monitoring by the optical frequency modulation Brillouin distributed measuring method
Author(s): Takashi Yari; Masato Ishioka; Kanehiro Nagai; Tateo Sakurai
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Paper Abstract

The necessity for Airplane structural health-monitoring technology has been increasing because of improvement of reliability and cost saving. Optical fiber sensor system is an attractive method for structural health monitoring, because of its lightweight, non-electromagnetic interference, and to be embeddable to composite structures. Especially the distributed optical fiber sensor fits the health monitoring for large-sized structures. However, the distributed optical fiber measurement system using the pulse light represented by BOTDR has low spatial resolution and long measurement interval. These performances have been the obstacle of application to airplane structure health monitoring system. Then, the authors have proposed the Brillouin optical frequency modulation method for improvement of the spatial resolution and shortening of measurement intervals. In this work, we conducted basic approach in order to develop Brillouin Optical Frequency Domain Analysis (BOFDA) measurement system, such as pump power property and frequency modulation property for Brillouin stimulated light. We confirmed ability to measure stimulated Brillouin Scattering light in 50mm section. Moreover, We considered the optical fiber sensor installation issue on the airplane structure. The issue is optical fiber sensor birefringence under asymmetric load and durability of installation method. We conducted two confirmatory tests for the issues. The proposed installation method has adequate performance. From these results, it was confirmed that BOFDA system has potential to be applied to an airplane structure health monitoring system.

Paper Details

Date Published: 16 May 2005
PDF: 11 pages
Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); doi: 10.1117/12.598710
Show Author Affiliations
Takashi Yari, Mitsubishi Heavy Industries, Ltd. (Japan)
Masato Ishioka, Mitsubishi Heavy Industries, Ltd. (Japan)
Kanehiro Nagai, Mitsubishi Heavy Industries, Ltd. (Japan)
Tateo Sakurai, R&D Institute of Metals and Composites for Future Industries (Japan)

Published in SPIE Proceedings Vol. 5758:
Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems
Eric Udd; Daniele Inaudi, Editor(s)

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