[2] Zhang Weigang, Dong Xiaoyi, Zhao Qida, et al. FBG-type sensor for simultaneous of force and temperature based on bilateral cantilever beam. IEEE Photon Technol Lett ,2001,13(4): 1340～1342

[3] Jung Jaehoon, Nam Hui, Lee Byoungho, et al. Fiber Bragg grating temperature sensor with controllable sensitivity. Applied Optics, 1999,38(13) :2752～2754

[5] Cong Jun,Zhang Xianmin,Chen Kangsheng, et al. Fiber optic Bragg grating sensor based on hydrogels for measuring salinity. Sensors and Actuators B : Chemical,2002,87(3) :487～490

[6] Patrick J H, Kersey A D, Bucholtz F. Analysis of the response of long period fiber gratings to external index of refraction. J Lightwave Technol, 1998, 16 (9): 1606 ～1612

[7] Muhammad F A,Stewart G. D-shaped optical fiber design for methane gas sensing. Electro Lett, 1992,28(13): 1205～1206

[9] Cordaro M H, Rode D L, Barry T S, et al. Precision fabrication of D-shaped single-mode optical fibers by In Situ Monitoring. J Llightwave Technol, 1994,12 (9):1524～1531