Jinghong Wu, Hao Liu, Peng Yang, Na Jiang. Identification and Monitoring of Concrete Cracks Based on Optical Frequency Domain Reflectometry Technique[J]. Laser & Optoelectronics Progress, 2019, 56(24): 241201
- Laser & Optoelectronics Progress
- Vol. 56, Issue 24, 241201 (2019)
Fig. 1. Working principle of OFDR
Fig. 2. Picture of optical cable
Fig. 3. OFDR demodulation instrument
Fig. 4. Schematic of fiber arrangement. (a) Before cracking; (b) after cracking
Fig. 5. Strain curves. (a) 1 cm spatial resolution; (b) 5 mm spatial resolution; (c) 2 mm spatial resolution
Fig. 6. Comparison of monitoring results under three spatial resolutions
Fig. 7. Comparison of measured and real values of crack width
Fig. 8. Experimental scheme. (a) Actual picture; (b) schematic diagram
Fig. 9. Cracking diagram of concrete beam bottom
Fig. 10. Strain of fiber 1 at each loading level
Fig. 11. Strain of fiber 2 at each loading level
Fig. 12. Width of crack 4 at each loading level
Fig. 13. Pictures of cracks. (a) Crack with 0.10 mm width; (b) crack with 0.22 mm width; (c) crack with 0.34 mm width
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Table 1. Distance to fixed end
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Table 2. Comparison of measured crack position data and measurement results of OFDR
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Table 3. Comparison of actual and measured values of crack widths
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