Affiliations 

  • 1 School of Human Settlements and Civil Engineering, Xi'an JiaoTong University, Xi'an 710048, China. luodong@xjtu.edu.cn
  • 2 School of Human Settlements and Civil Engineering, Xi'an JiaoTong University, Xi'an 710048, China. jerrylee@xjtu.edu.cn
  • 3 School of Human Settlements and Civil Engineering, Xi'an JiaoTong University, Xi'an 710048, China. yuey@xjtu.edu.cn
  • 4 School of Human Settlements and Civil Engineering, Xi'an JiaoTong University, Xi'an 710048, China. majx@xjtu.edu.cn
  • 5 Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia. yanghz2005@hotmail.com
Sensors (Basel), 2017 May 04;17(5).
PMID: 28471372 DOI: 10.3390/s17050962

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.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.