We conducted the strain measurements to monitor steel pipe buckling for the first time using distributed Brillouin sensor system. Two specimens (steel pipeline and beam) were prepared by locally thinning the inner wall to provoke buckling. Fibre was laid along the external walls of the specimens. Strain gauges were glued in thinned wall area. An axial load was applied to the specimens and increased while compressive strain was measured by both Brillouin sensor and the strain gauges. The Brillouin sensor measurements showed the convolution of the all the strain distribution within the spatial resolution, the fitting Brillouin peak corresponds to the average strain over the spatial resolution, hence its reading can be smaller than the strain gauge reading depending on the location. With the Brillouin sensors, we observed compression in the whole specimens while elongation was detected in the neighbourhood of the thinned wall at onset of the buckling for the first time. The buckling was identified and localized with the Brillouin sensor measurement.

Additional Metadata
Keywords Brillouin scattering, Distributed sensing, Optical fibre, Strain and temperature measurements, Structural Health Monitoring
Persistent URL dx.doi.org/10.1117/12.567241
Conference Photonics North 2004: International Conference on Applications of Photonic Technology, ICAPT
Citation
Ravet, F. (Fabien), Zou, L. (Lufan), Bao, X. (Xiaoyi), Chen, L. (Liang), Huang, R. (Rongfeng), & Khoo, H. A. (2004). Demonstration of the detection of buckling effects in steel pipelines and beams by the distributed Brillouin sensor. Presented at the Photonics North 2004: International Conference on Applications of Photonic Technology, ICAPT. doi:10.1117/12.567241