[1] [1] Alan D. Kersey, Michael A. Davis, Heather J. Patrick et al.. Fiber grating sensors [J]. J. Lightwave Technol., 1997, 15(8): 1442～1463

[4] [4] Xiaomei Liu, Shilie Zheng, Xianmin Zhang et al.. Bragg grating chemical sensor with hydrogel as sensitive element[J]. Chin. Opt. Lett., 2004, 2(12): 683～685

[5] [5] Heather J. Patrick, Alan D. Kersey, Frank bucholtz. Analysis of the response of long period fiber gratings to external index of refraction[J]. J. Lightwave Technol., 1998, 16(9): 1606～1612

[6] [6] R. Falciai, A. G. Mignani, A. Vannini. Long period gratings as solution concentration sensors[J]. Sensors and Actuators B, 2001, 74(1～3): 74～77

[7] [7] Xuewen Shu, Lin Zhang, Ian Bennion. Sensitivity characteristics of long-period fiber gratings[J]. J. Lightwave Technol., 2002, 20(2): 255～266

[8] [8] D. A. Pereira, O. Frazao, J. L. Santos. Fiber Bragg grating sensing system for simultaneous measurement of salinity and temperature[J]. Opt. Engng., 2004, 43(2): 299～304

[9] [9] Wei Liang, Yanyi Huang, Yong Xu et al.. Highly sensitive fiber Bragg grating refractive index sensors[J]. Appl. Phys. Lett., 2005, 86(15): 151122-1～151122-3

[10] [10] K. Schroeder, W. Ecke, R. Mueller et al.. A fiber Bragg grating refractometer[J]. Meas. Sci. Technol., 2001, 12(7): 757～764

[12] [12] K. Zhou, X. Chen, L. Zhang et al.. High-sensitivity optical chemsensor based on etched D-fibre Bragg gratings[J]. Electron. Lett., 2004, 40(4): 232～234

[13] [13] G. Laffont, P. Ferdinand. Titled short-period fiber-Bragg-grating-induced coupling to cladding modes for accurate refractometry[J]. Meas. Sci. Technol., 2001, 12(7): 765～770

[14] [14] James A. Besley, Teresa Wang, Laurence Reekie. Fiber cladding mode sensitivity characterization for long-period gratings[J]. J. Lightwave Technol., 2003, 21(3): 848～853

[15] [15] Turan Erdogan. Cladding-mode resonances in short- and long-period fiber grating filters[J]. J.Opt. Soc. Am. A, 1997, 14(8): 1760～1773