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http://dx.doi.org/10.5916/jkosme.2007.31.6.761

Novel Long-period Fiber Grating devices for Monitoring the Deformation of Ship Hull  

Sohn, Kyung-Rak (한국해양대학교 컴퓨터제어전자통신공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.31, no.6, 2007 , pp. 761-767 More about this Journal
Abstract
We have developed novel optical-fiber sensors based on strain-induced long-period fiber gratings for monitoring the deformation of a hull. They have no external pressure for sustaining the mechanical formed gratings. The pressure, which provides a force to form the periodic grating along the single mode fiber, was realized by the bonding strength of a photopolymer. To reduce the polarization dependency of the sensors caused by the asymmetry structure of gratings, a Faraday Rotator Mirror (FRM) was utilized in this experiment. We have realized the polarization-insensitive function of the proposed sensors. The change of an external strain are measured by an optical spectrum analyzer. When the external stain increases. the attenuation at the resonant wavelength decreases and the loss peak was slightly shifted to the shorter wavelength.
Keywords
Fiber optic sensors; Long-Period fiber gratings; Pressure sensors; Strain-induced gratings;
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