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Proceedings Paper

Stretch-tuning optical fiber Bragg gratings using macro-fiber composite (MFC) piezoelectric actuators
Author(s): Sidney G. Allison; Qamar A. Shams; Demetris L. Geddis
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Paper Abstract

The demand for high safety and reliability standards for aerospace vehicles has resulted in time-consuming periodic on-ground inspections. These inspections usually call for the disassembling and reassembling of the vehicle, which can lead to damage or degradation of structures or auxiliary systems. In order to increase aerospace vehicle safety and reliability while reducing the cost of inspection, an on-board real-time structural health monitoring sensing system is required. There are a number of systems that can be used to monitor the structures of aerospace vehicles. Fiber optic sensors have been at the forefront of the health monitoring sensing system research. Most of the research has been focused on the development of Bragg grating-based fiber optic sensors. Along with the development of fiber Bragg grating sensors has been the development of a grating measurement technique based on the principle of optical frequency domain reflectometry (OFDR), which enables the interrogation of hundreds of low reflectivity Bragg gratings. One drawback of these measurement systems is the 1 - 3 Hz measurement speed, which is limited by commercially available tunable lasers. The development of high-speed fiber stretching mechanisms to provide high rate tunable Erbium-doped optical fiber lasers can alleviate this drawback. One successful approach used a thin-layer composite unimorph ferroelectric driver and sensor (THUNDER) piezoelectric actuator, and obtained 5.3-nm wavelength shift. To eliminate the mechanical complexity of the THUNDER actuator, the research reported herein uses the NASA Langley Research Center (LaRC) Macro-Fiber Composite (MFC) actuator to tune Bragg grating based optical fibers.

Paper Details

Date Published: 10 November 2005
PDF: 10 pages
Proc. SPIE 6004, Fiber Optic Sensor Technology and Applications IV, 60040C (10 November 2005); doi: 10.1117/12.631191
Show Author Affiliations
Sidney G. Allison, NASA Langley Research Ctr. (United States)
Qamar A. Shams, NASA Langley Research Ctr. (United States)
Demetris L. Geddis, Norfolk State Univ. (United States)

Published in SPIE Proceedings Vol. 6004:
Fiber Optic Sensor Technology and Applications IV
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

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