Airplane structure health monitoring by the optical frequency modulation Brillouin distributed measuring method

Takashi Yari; Masato Ishioka; Kanehiro Nagai; Tateo Sakurai

doi:10.1117/12.598710

16 May 2005 Airplane structure health monitoring by the optical frequency modulation Brillouin distributed measuring method

Takashi Yari, Masato Ishioka, Kanehiro Nagai, Tateo Sakurai

Author Affiliations +

Proceedings Volume 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems; (2005) https://doi.org/10.1117/12.598710
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

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.

Citation Download Citation

Takashi Yari, Masato Ishioka, Kanehiro Nagai, and Tateo Sakurai "Airplane structure health monitoring by the optical frequency modulation Brillouin distributed measuring method", Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); https://doi.org/10.1117/12.598710

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