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| CORROSION MONITORING OF CONCRETE STRUCTURES BY OPTICAL FIBER GRATING |
| LI Jun; WU Jin; GAO Junqi |
| Civil Department; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 |
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Abstract A new type of optical fiber grating sensor for monitoring corrosion of reinforcement steel was presented--optical fiber grating corrosion sensor with two steel bars. In the sensor, Bragg grating is stick on the top surface of two bars against each other, for which the principle is that the steel volume will be expanded due to corrosion. The monitoring will be carried out by transforming the volume increase to the fiber strain. While Bragg gratings is tensioned, the reflected spectrum will have a single distinct peak shift in center wavelength, as a result the loss and rate of steel corrosion can be obtained. By the designed sensor, corrosion is recorded with the shift in center wavelength through the fiber, and the degree of corrosion of reinforcement steel will be measured indirectly, which is not affected by corrosion factors. Therefore the sensor proposed in the paper could be used in the early corrosion monitoring of reinforcement steel in concrete structures.
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Received: 21 June 2007
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TP212
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TG174.3
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TU375
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Corresponding Authors:
LI Jun
E-mail: Lij\_nh@nuaa.edu.cn
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