A Combined Positioning Method Used for Identification of Concrete Cracks

Abstract

Fully distributed fiber optic sensors are characteristically used for the measurement of long distances and continuous distribution of space. However, due to the different fiber type, fiber length, ambient temperature and strain, fully distributed fiber optic sensors fail to locate damage accurately and cause a greater error. Therefore, this paper proposes a new positioning method of combining fully distributed fiber optic sensors with fiber Bragg gratings, which enables accurately the localization of a structural damage during the long-term monitoring of fully distributed fiber optic sensors. Moreover, the coupling mechanism of the reflected light from fiber grating and excited Brillouin scattering light is illustrated. Further, it is experimentally verified by locating the cracks of 2 m long reinforced concrete beams. The experimental results show that this proposed method is capable of monitoring the generation of the beam crack and further locating the crack on the concrete beam with an approximate error of 10 cm.

Editorial for a Special Issue of Selected Papers from the 23rd Annual Conference and 12th International Conference of the Chinese Society of Micro-NanoTechnology (CSMNT 2021)

“…Due to differences in fibre type and length, ambient temperature, and strain, fully distributed fibre optic sensors fail to locate damage accurately and cause greater error. The authors propose a new positioning method that combines fully distributed fibre optic sensors with fibre Bragg gratings, which enables the accurate localization of structural damage during long-term monitoring with fully distributed fibre optic sensors [ 2 ]. Using COMSOL Multiphysics software and a neural network/genetic algorithm approach, the authors optimized the process parameters of microscale meniscus-confined electrodeposition to achieve highly efficient, high-quality deposition.…”