From the angle of sensitivity of the long period fiber grating (LPFG) resonant transmission spectrum, we demonstrate the sensitivity of LPFG resonance peak amplitude changing with transverse loads. The design of a resonant peak modulation-based LPFG rebar corrosion sensor is described by combining the spectral characteristics of LPFG with the expansion state monitoring of rebar corrosion. LPFG spectrum curves corresponding with different rebar corrosion status of the environment under test are captured by the monitoring technique of LPFG transmission spectra, and the relationship between the resonance peak amplitude change and the state of rebar corrosion is obtained, that is, the variation of LPFG resonance peak amplitude increases with the intensifying of the degree of rebar corrosion. The experimental results numerically show that the sensor response has good regularity for a wide range of travel.
© 2013 Optical Society of America
Diffraction and Gratings
Original Manuscript: January 4, 2013
Revised Manuscript: March 25, 2013
Manuscript Accepted: April 8, 2013
Published: May 6, 2013
Hong-yue Liu, Da-kai Liang, Xiao-lin Han, and Jie Zeng, "Long period fiber grating transverse load effect-based sensor for the omnidirectional monitoring of rebar corrosion in concrete," Appl. Opt. 52, 3246-3252 (2013)