Preliminary development and evaluation of fibre-optic chemical sensors

McPolin, Daniel, Basheer, Muhammed P. A., Grattan, Kenneth T. V., Long, Adrian E., Sun, Tong and Xie, Weiguo (2011) Preliminary development and evaluation of fibre-optic chemical sensors. Journal of Materials in Civil Engineering, 23 8: 1200-1210. doi:10.1061/(ASCE)MT.1943-5533.0000290

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Author McPolin, Daniel
Basheer, Muhammed P. A.
Grattan, Kenneth T. V.
Long, Adrian E.
Sun, Tong
Xie, Weiguo
Title Preliminary development and evaluation of fibre-optic chemical sensors
Journal name Journal of Materials in Civil Engineering   Check publisher's open access policy
ISSN 0899-1561
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1061/(ASCE)MT.1943-5533.0000290
Volume 23
Issue 8
Start page 1200
End page 1210
Total pages 11
Place of publication Reston, VA, United States
Publisher American Society of Civil Engineers
Collection year 2012
Language eng
Abstract Conventional methods of measuring carbonation and chloride ingress exist, but they are either inaccurate, expensive, or involve destructive testing. In seeking new solutions to this problem, the potential to use novel fiber-optic chemical sensors developed specifically for this application and designed to monitor chemical changes in cementitious materials, in situ and nondestructively, was explored in this study. Three types of fiber-optic sensors were thus constructed, tested, and evaluated, viz a temperature sensor, a pH sensor, and chloride sensors. The temperature sensor was based on the fluorescence decay of temperature-dependent materials, whereas the pH and chloride sensors were based on sol-gel technology, with pH and chloride sensitive indicators impregnated in the sol-gels. All the sensors were tested in situ, and subsequently, the temperature and the pH sensors were embedded in mortar and tested. It was found that both the temperature sensor and the pH sensor could function correctly for over 18 months after placement, but there was an issue with alignment of the sensor each time it was reconnected to the hardware. However, the laboratory tests showed that the chloride sensor was not reversible, and therefore further refinement was considered to be necessary before it could be used in situ in environments where the chloride content was known, from other measurements, to decrease. Research is ongoing to refine the sensor performance and expands the in situ testing program. The sensors themselves are inexpensive to fabricate, but the sensing hardware used in this work is costly because of its high versatility.
Keyword Carbonation
Chloride ingress
Fiber optics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Tue, 11 Oct 2011, 09:27:38 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre