Highly sensitive long-period fiber-grating strain sensor with low temperature sensitivity
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作者:
Wang, Yi-Ping
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Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China
Wang, Yi-Ping
[1
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Xiao, Limin
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机构:Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China
Xiao, Limin
Wang, D. N.
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机构:Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China
Wang, D. N.
Jin, Wei
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机构:Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China
Jin, Wei
机构:
[1] Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China
A long-period fiber-grating sensor with a high strain sensitivity of -7.6 pm/mu epsilon and a low temperature sensitivity of 3.91 pm/degrees C is fabricated by use of focused CO2 laser beam to carve periodic grooves on a large-mode-area photonic crystal fiber. Such a strain sensor can effectively reduce the cross-sensitivity between strain and temperature, and the temperature-induced strain error obtained is only 0.5 mu E/degrees C without using temperature compensation. (c) 2006 Optical Society of America.