Luo Dong, Li Peng, Yue Yanchao, Ma Jianxun, Yang Hangzhou
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.
Sensors (Basel). 2017 May 4;17(5):962. doi: 10.3390/s17050962.
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.
由于存在盐溶液——混凝土浆体和钢筋的天然腐蚀剂，保护海洋环境中的混凝土结构免受腐蚀一直是一项挑战。盐的浓度是影响腐蚀速率的关键参数。在本文中，我们提出了一种基于光纤的盐度传感器，该传感器以成束的多模塑料光纤（POF）作为传感探头，以凹面镜作为反射器，并结合强度调制技术。对一种折射率（RI）传感方法进行了分析研究，研究结果与实验结果一致。在折射率为1.3525时，可实现的最大灵敏度为14847.486/RIU。所提出的技术适用于液体中盐度的原位测量和监测。
