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Proceedings Paper

Overview of damage detection and damage suppression demonstrator and strain distribution measurement using distributed BOTDR sensors
Author(s): Takashi Yari; Kanehiro Nagai; Takayuki Shimizu; Nobuo Takeda
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Paper Abstract

Structural health monitoring using optical fiber sensor is very attractive for aerospace structures, because of lightweight, durability and capability to be embedded in composites. Especially, distributed optical fiber sensing system, such as Brillouin Optical Time Domain Reflectometer (BOTDR), is hopeful method for large-scale composite structures. However, it is necessary to solve some problems for applying to aerospace structures. Low spatial resolution, strain/temperature effect, and long measuring period are the capital problems to be solved. For solutions of these problems, we have already reported these solutions. In this paper, we present practical application of the proposed techniques through the demonstrator test. Firstly, we measured mechanical strain and temperature simultaneously during CFRP panel curing process using a combined system of BOTDR and fiber Bragg grating (FBG) sensors with wavelength division multiplexing (WDM). Secondly, we measured the distributed strain in the whole structure and applied differential spectra method for improvement of a spatial resolution.

Paper Details

Date Published: 14 August 2003
PDF: 9 pages
Proc. SPIE 5054, Smart Structures and Materials 2003: Industrial and Commercial Applications of Smart Structures Technologies, (14 August 2003); doi: 10.1117/12.483868
Show Author Affiliations
Takashi Yari, Mitsubishi Heavy Industries, Ltd. (Japan)
Kanehiro Nagai, Mitsubishi Heavy Industries, Ltd. (Japan)
Takayuki Shimizu, Mitsubishi Heavy Industries, Ltd. (Japan)
Nobuo Takeda, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 5054:
Smart Structures and Materials 2003: Industrial and Commercial Applications of Smart Structures Technologies
Eric H. Anderson, Editor(s)

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