Experiment on a highly sensitive fiber Bragg grating optical sensor to monitor strain and corrosion in civil structures

摘要

An efficient and highly sensitive fiber Bragg grating optical sensor is demonstrated to detect strain and corrosion in civil structures. The sensitivity of the fiber Bragg grating optical sensor is enhanced after examining different grating shapes, grating lengths, and refractive indexes of the core. The experimental results show that the proposed uniform grated fiber Bragg grating with 1.46 refractive index and 50,000 mu m grating length provides better sensitivity in terms of wavelength shift (approximately 3 nm). The theoretical results are also compared with the experimental results for validation, and it is observed that the proposed sensor can monitor strain/corrosion with high sensitivity and speed. (c) 2018 Optical Society of America