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Sensors 2017, 17(5), 962; doi:10.3390/s17050962

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

1
School of Human Settlements and Civil Engineering, Xi’an JiaoTong University, Xi’an 710048, China
2
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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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. 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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