摘要
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 LP_(14) 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/%.
作者
SHI Sheng-Hui
ZHOU Xiao-Jun
ZHANG Zhi-Yao
LAN Lan
YIN Cong
LIU Yong
石胜辉;周晓军;张旨遥;兰岚;尹聪;刘永(School of Opto-electronic Information,University of Electronic Science and Technology of China,Chengdu 610054;State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 60925019 and 61090393
the National Basic Research Program of China(973 Program)under Grant No 2011CB301705
the Research Foundation in University of Electronic Science and Technology of China under Grant Nos ZYGX2011J052 and ZYGX2011J051.
