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Journal of Sensors
Volume 2012 (2012), Article ID 539095, 17 pages
http://dx.doi.org/10.1155/2012/539095
Review Article

Sensing and Demodulation of Special Long-Period Fiber Gratings Induced by Scanning Laser Pulses

Key Laboratory of Optoelectronic Technology and Systems of the Ministry of Education of China, Chongqing University, Chongqing 400044, China

Received 16 March 2012; Revised 28 September 2012; Accepted 8 October 2012

Academic Editor: Eugenio Martinelli

Copyright © 2012 Tao Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A review of long-period fiber gratings (LPFGs) with special structures induced by scanning CO2 laser pulses in single mode fiber (SMF) is presented in this paper. In the first part, the special structures and fabrication methods of LPFGs are demonstrated in detail. Next, the special LPFG-based sensors are demonstrated, such as refractive index sensor, strain sensor with temperature compensation, and torsion sensor without temperature crosstalking. Finally, several investigation methods including intensity, wavelength shift, and fiber ring laser demodulation are discussed.