Highly sensitive long-period fiber-grating strain sensor with low temperature sensitivity.

  title={Highly sensitive long-period fiber-grating strain sensor with low temperature sensitivity.},
  author={Yi-ping Wang and Limin Xiao and D. N. Wang and Wei Jin},
  journal={Optics letters},
  volume={31 23},
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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