Fluorescence based fibre optic pH sensor for the pH 10-13 range suitable for corrosion monitoring in concrete structures
Fluorescence based fibre optic pH sensor for the pH 10-13 range suitable for corrosion monitoring in concrete structures
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DOI：
10.1016/j.snb.2013.09.072
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发表时间：
2014-02-01
影响因子：
8.4
通讯作者：
Long, Adrian E.
中科院分区：
文献类型：
--
作者：
Nguyen, T. Hien;Venugopala, Thillainathan;Long, Adrian E.
本文详细讨论了一种用于监测碱性地区pH的光纤pH传感器的设计、研制和评价。这种特殊的pH传感器的设计是基于香豆素咪唑染料的pH引起的荧光强度的变化，香豆素咪唑染料共价连接到聚合物网络上，然后固定在光纤的远端。该传感器在pH为10.0-13.2的范围内提供响应，可接受的响应速度约为50分钟，迄今在20个月以上的时间内表现出非常良好的稳定性。通过一系列的实验室测试，该传感器对离子强度(IS)几乎没有交叉敏感性，并且具有很好的光稳定性。这些特点使得这种类型的传感器可能非常适合于现场长期监测混凝土结构中的pH值，以加强土木工程部门的结构监测。皇冠版权所有(C)2013由爱思唯尔B.V.出版。保留所有权利。
The design, development and evaluation of an optical fibre pH sensor for monitoring pH in the alkaline region are discussed in detail in this paper. The design of this specific pH sensor is based on the pH induced change in fluorescence intensity of a coumarin imidazole dye which is covalently attached to a polymer network and then fixed to the distal end of an optical fibre. The sensor provides a response over a pH range of 10.0-13.2 with an acceptable response rate of around 50 min, having shown a very good stability over a period of longer than 20 months thus far. The sensor has also demonstrated little cross-sensitivity to ionic strength (IS) and also excellent photostability through a series of laboratory tests. These features make this type of sensor potentially well suited for in situ long term monitoring of pH in concrete structures, to enhance structural monitoring in the civil engineering sector. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.