Journal
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 53, Issue 11, Pages 3045-3050Publisher
SCIENCE CHINA PRESS
DOI: 10.1007/s11431-010-4111-4
Keywords
fiber optic sensor; crack; concrete
Funding
- National Natural Science Foundation of China [50909041, 50539110, 50809025, 50879024]
- National Science and Technology Support Plan [2008BAB29B03, 2008BAB29B06]
- China Hydropower Engineering Consulting Group Co. [CHC-KJ-2007-02]
- Jiangsu Province 333 High-Level Personnel Training Project [2017-B08037]
- Science Foundation for the Excellent Youth Scholars of Ministry of Education of China [20070294023]
- State Key Laboratory of China [2009586012]
- Fundamental Research Funds for the Central Universities [2009B08514]
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The formation and propagation of cracks reflect the aging and pathologic changes of concrete structures and may cause problems such as seepage and long-term durability. Crack detection and monitoring is therefore an effective way to evaluate structural health conditions. An important challenge in such a task is that the locations and orientations of cracks in concrete structures are difficult to predict due to material inhomogeneity and complexity. The number of the required conventional electric and electromagnetic sensors to cover all possible cracks may be too large to be practical for a monitoring scheme. In this paper, a fiber optic sensor with distributed crack sensing capability based on optical time domain reflectometry is proposed and its sensing principle is introduced. Experiments are conducted to obtain the optical power loss versus crack opening at different fiber inclination angles, and then a model is developed to quantify it. Finally, an experiment is performed to demonstrate the practical application of the sensor. The test results show that detecting and monitoring cracks with the sensor do not require a-priori knowledge of crack locations and orientations.
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