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Proceedings Paper

High-sensitivity temperature-independent strain sensor based on a long-period fiber grating with a CO2-laser engraved rotary structure
Author(s): T. Zhu; Y. J. Rao; Y. Song; K. S. Chiang
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Paper Abstract

We present a highly sensitive strain sensor based on the use of a long-period fiber grating with rotary grooves carved by high-frequency CO2-laser pulses. We observe that, when the rotation rate of the grooves is sufficiently large, the resonance peak of the grating split into two with a wavelength separation that changes sensitively with the strain applied along the grating and remains practically constant with a change in the ambient temperature. By measuring the wavelength separation of the two resonance peaks, we obtain a strain sensitivity of ~0.1 nm/με without any temperature compensation, which is larger than that of a conventional long-period fiber grating by almost two orders of magnitude.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70040C (16 May 2008); doi: 10.1117/12.785788
Show Author Affiliations
T. Zhu, Chongqing Univ. (China)
Univ. of Electronic Science & Technology of China (China)
Y. J. Rao, Univ. of Electronic Science & Technology of China (China)
Chongqing Univ. (China)
Y. Song, Chongqing Univ. (China)
K. S. Chiang, City Univ. of Hong Kong (Hong Kong China)
Univ. of Electronic Science & Technology of China (China)
Chongqing Univ. (China)


Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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