Highly sensitive long-period fiber-grating strain sensor with low temperature sensitivity |
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Authors: | Wang Yi-Ping Xiao Limin Wang D N Jin Wei |
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Affiliation: | Department of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong, China. |
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Abstract: | A long-period fiber-grating sensor with a high strain sensitivity of -7.6 pm/microepsilon and a low temperature sensitivity of 3.91 pm/ degrees C is fabricated by use of focused CO(2) 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 microepsilon/ degrees C without using temperature compensation. |
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