6PEREIRA D A, FRAZAO O, SANTOS J L. Fiber Bragg grating sensing system for simultaneous measurement of salinity and temperature [J]. Optieal Engineering, 2004, 43(2): 299-304.
7ZHAO Yong. ZHANG Bo , LIAO Yan-biao, et al. Experimental investigation of salinity measurement based on optical-electrical dual-differential methods [C]//Proceedings of SPIE. 2002, 4920: 496-500.
8ZHAO Yong, LIAO Yan-biao, ZHANG Bo, et al. Monitoring technology of salinity in water with optical fiber sensor [J]. Lightwave Technol, 2003, 21(5):1334-1338.
9CONG Jun, ZHANG Xian-min, CHEN Kang-sheng, et al. Fiber optic Bragg grating sensor based on hydrogels for measuring salinity [J]. Sensors and Actuators B: Chemical, 2002, 87(3): 487-490.
10PETERSON J I, GOLDSTEIN S R, FITZGERALD R V. Fiber optic pH probe for physiological use [J]. Anal Chem, 1980, 52: 864-869.