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Sensors 2017, 17(5), 962;

In-Fiber Optic Salinity Sensing: A Potential Application for Offshore Concrete Structure Protection

School of Human Settlements and Civil Engineering, Xi’an JiaoTong University, Xi’an 710048, China
Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia
Author to whom correspondence should be addressed.
Academic Editor: Nunzio Cennamo
Received: 5 January 2017 / Revised: 24 April 2017 / Accepted: 24 April 2017 / Published: 4 May 2017
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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. View Full-Text
Keywords: concrete structure; salinity; fiber optic sensor concrete structure; salinity; fiber optic sensor

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Luo, D.; Li, P.; Yue, Y.; Ma, J.; Yang, H. In-Fiber Optic Salinity Sensing: A Potential Application for Offshore Concrete Structure Protection. Sensors 2017, 17, 962.

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