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Proceedings Paper

Strain measurement using a Brillouin optical time domain reflectometer for development of aircraft structure health monitoring system
Author(s): Takayuki Shimizu; Takashi Yari; Kanehiro Nagai; Nobuo Takeda
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Paper Abstract

We conducted theoretical and experimental approaches for applying Brillouin optical time domain reflectometer (BOTDR) to aircraft and spacecraft structure health monitoring system. Firstly, distributed strain was measured by BOTDR under 3-point bending test and a spatial resolution was enhanced up to 0.5m using Brillouin spectrum analysis and processing though the device used in this experiment had a spatial resolution of 2m normally. Secondly, dynamic strain measurement was executed under cyclic loading conditions. Brillouin spectrum measured under dynamic conditions is equivalent to superposed spectrum using many spectra measured under static loading conditions. As the measured spectrum was decomposed into many spectra in static loading state, the strain amplitude and its ratio could be estimated. Thirdly, strain and temperature could be measured independently using combined system of BOTDR and fiber Bragg grating (FBG) with wavelength division multiplexing (WDM). Additionally, the application of BOTDR sensing system was shown for a prototype carbon fiber reinforced plastic (CFRP) liquid hydrogen (LH2) tank under cryogenic condition.

Paper Details

Date Published: 24 July 2001
PDF: 11 pages
Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); doi: 10.1117/12.434187
Show Author Affiliations
Takayuki Shimizu, Mitsubishi Heavy Industries, Ltd. (Japan)
Takashi Yari, Mitsubishi Heavy Industries, Ltd. (Japan)
Kanehiro Nagai, Mitsubishi Heavy Industries, Ltd. (Japan)
Nobuo Takeda, Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 4335:
Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring
Tribikram Kundu, Editor(s)

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