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A Novel Optical Fiber Sensor for Steel Corrosion in Concrete Structures
Christopher K Y Leung1, Kai Tai Wan2, Liquan Chen1
1Department of Civil Engineering, the Hong Kong University of Science and Technology, Hong Kong SAR.
Sensors (Basel, Switzerland)
|November 24, 2016
Summary
A new low-cost optical fiber sensor detects steel corrosion in concrete by monitoring light reflection from an iron coating. Reduced reflection indicates corrosion, enabling early detection and structural integrity assessment.
Area of Science:
- Materials Science
- Civil Engineering
- Sensor Technology
Background:
- Steel corrosion is a primary cause of reinforced concrete structure degradation.
- Chloride ions and carbon dioxide penetration accelerate concrete deterioration.
Purpose of the Study:
- Develop a cost-effective sensor for detecting steel corrosion in concrete.
- Utilize a simple physical principle for corrosion monitoring.
Main Methods:
- Coating a cut optical fiber end with an iron thin film via ion sputtering.
- Embedding the fiber in concrete and monitoring the reflected light signal.
- Corrosion causes the iron layer to degrade, reducing reflected light power.
Main Results:
- The sensor's principle was verified through experimental results.
- A significant reduction in reflected light power indicates iron layer removal due to corrosion.
- Monitoring reflected signals effectively assesses corrosive concrete environments.
Conclusions:
- The developed optical fiber sensor offers a viable method for monitoring steel corrosion in concrete.
- The sensor's performance was evaluated through packaging and additional experiments.
- This technology can aid in assessing and preventing structural degradation.
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