聚酰亚胺
材料科学
包层(金属加工)
盐度
折射率
波长
水溶液
光学
光纤传感器
光纤
复合材料
光电子学
纤维
图层(电子)
化学
生物
物理
物理化学
生态学
作者
Dong Luo,Jianxun Ma,Zainah Ibrahim,Zubaidah Ismail
标识
DOI:10.1016/j.optcom.2016.12.068
摘要
In marine environment, concrete structures can corrode because of the PH alkalinity of concrete paste; and the salinity PH is heavily related with the concentration of salt in aqueous solutions. In this study, an optical fiber salinity sensor is proposed on the basis of an etched FBG (EFBG) coated with a layer of polyimide. Chemical etching is employed to reduce the diameter of FBG and to excite Cladding Mode Resonance Wavelengths (CMRWs). CMRW and Fundamental Mode Resonance Wavelength (FMRW) can be used to measure the Refractive index (RI) and temperature of salinity. The proposed sensor is then characterized with a matrix equation. Experimental results show that FMRW and 5th CMRW have the detection sensitivities of 15.407 and 125.92 nm/RIU for RI and 0.0312 and 0.0435 nm/°C for temperature, respectively. The proposed sensor can measure salinity and temperature simultaneously.
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