期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 21, 期 8, 页码 543-545出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2009.2014566
关键词
CO2 lasers; long-period fiber gratings (LPFGs); optical fiber sensors; strain sensor; temperature-independent
资金
- Natural Science Foundation of China [60807019, CSTC 2009BB2165]
- Chongqing University. China
We present a highly sensitive strain sensor based on the use of a long-period fiber grating (LPFG) 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 splits 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 similar to 0.1067 +/- 0.0075 nm/mu epsilon without any temperature compensation, which is larger than that of a conventional LPFG by almost two orders of magnitude.
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