In-Fiber Optic Salinity Sensing: A Potential Application for Offshore Concrete Structure Protection
Document Type
Article
Publication Date
1-1-2017
Abstract
The protection of concrete structures against corrosion in marine environments has always been a challenge due to the presence of a saline solution—A natural corrosive agent to the concrete paste and steel reinforcements. The concentration of salt is a key parameter influencing the rate of corrosion. In this paper, we propose an optical fiber-based salinity sensor based on bundled multimode plastic optical fiber (POF) as a sensor probe and a concave mirror as a reflector in conjunction with an intensity modulation technique. A refractive index (RI) sensing approach is analytically investigated and the findings are in agreement with the experimental results. A maximum sensitivity of 14,847.486/RIU can be achieved at RI = 1.3525. The proposed technique is suitable for in situ measurement and monitoring of salinity in liquid.
Keywords
Concrete structure, Salinity, Fiber optic sensor
Divisions
fac_eng
Funders
National Natural Science Foundation of China (Nos. 51508460; 11402187; 51178390; 51408481),National Post-Doctoral Science Foundation (No. 2015M570838),Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JQ5017; 2013JQ7003),Postgraduate Research Fund of Shaanxi Province (2016BSHB083),Fundamental Research Funds for the Central Universities, SRF for ROCS, SEM (No. 2013-025)
Publication Title
Sensors
Volume
17
Issue
5
Publisher
MDPI