Fiber-Optic Solution Concentration Sensor Based on a Pressure-Induced Long-Period Grating in a Composite Waveguide
SHI Sheng-Hui1, ZHOU Xiao-Jun1**, ZHANG Zhi-Yao1, LAN Lan1, YIN Cong1, LIU Yong1,2
1School of Opto-electronic Information, University of Electronic Science and Technology of China, Chengdu 610054 2State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054
Abstract：A fiber-optic solution concentration sensor based on a pressure-induced long-period grating (LPG) in a composite optical waveguide is proposed. The composite waveguide consists of a standard single-mode fiber with its coating stripped away, a teflon-cannula and the medium to be measured. An experiment has been carried out to measure the concentration of the sodium chloride (NaCl) solution. The results show that the central resonant wavelengths of the LPG shift towards shorter wavelengths when the concentration of the NaCl solution increases. The central resonant wavelength of the LP14 cladding mode exhibits a total blue shift of 4.13 nm in the NaCl solution concentration range of 0–25%, which corresponds to a sensing sensitivity of 0.17 nm/%.
. [J]. 中国物理快报, 2012, 29(9): 94206-094206.
SHI Sheng-Hui, ZHOU Xiao-Jun, ZHANG Zhi-Yao, LAN Lan, YIN Cong, LIU Yong. Fiber-Optic Solution Concentration Sensor Based on a Pressure-Induced Long-Period Grating in a Composite Waveguide. Chin. Phys. Lett., 2012, 29(9): 94206-094206.
2012, Vol. 29 
