[1] [1] Bhatia V. Applications of long-period gratings to single and multi-parameter sensing [J]. Opt Express, 1999, 4(11): 457-466.

[2] [2] Guan Shouhua, Yu Qingxu, Zheng Jianzhou. Study on torsion characteristics of a new-type long-period fiber grating [J]. Chinese J Lasers, 2010, 37(8): 1996-2000.

[3] [3] Zeng Xiangkai, Rao Yunjiang, Liang Kuai. Characteristic analysis of LPFG resonance wavelength shift owing to transverse load [J]. Acta Optica Sinica, 2011, 31(1): 0106002.

[4] [4] Liu Hongyue, Liang Dakai, Zeng Jie, et al.. Long period fiber grating refractive index sensitivity-based reinforcing rebar corrosion sensor in concrete [J]. Acta Optica Sinica, 2011, 31(8): 0806009.

[5] [5] Bhatia V, Campbell D K, Sherr D, et al.. Temperature-insensitive and strain-insensitive long-period grating sensors for smart structures [J]. Opt Eng, 1997, 36(7): 1872-1876.

[6] [6] Jang J N, Kim S Y, Kim S W, et al.. Temperature insensitive long-period fibre gratings [J]. Electron Lett, 1999, 35(24): 1014-1015.

[7] [7] Guan Shouhua, Yu Qingxu, Song Shide, et al.. Theoretical and experimental study on temperature characteristic of long-period fibre grating [J]. Chinese J Sensors and Actuators, 2007, 20(3): 543-545.

[8] [8] Liang Lili, Liu Mingsheng, Li Yan, et al.. The method of one-time writing LPFG using high frequency CO2 laser [J]. Laser & Optoelectronics Progress, 2013, 50(9): 090503.