期刊
OPTICS COMMUNICATIONS
卷 392, 期 -, 页码 218-222出版社
ELSEVIER
DOI: 10.1016/j.optcom.2016.12.068
关键词
Salinity; Chemical etching; FBG,polyimide; Fiber optic sensor
类别
资金
- National Post-Doctoral Science Foundation [2015M570838]
- National Natural Science Foundation of China [51508460, 51178390]
- Natural Science Basic Research Plan in Shanxi Province of China [2016JQ5017]
- Postgraduate Research Fund of Shaanxi Province [2016BSHB083]
- University Malaya Research [RG132/11AET]
- Postgraduate Research Fund, University of Malaya [PV032-2012A]
- Fundamental Research Grant Scheme, Ministry of Higher Education, Malaysia [FP066/2010A]
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/degrees C for temperature, respectively. The proposed sensor can measure salinity and temperature simultaneously.
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