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Multipoint Pressure-detection Sensors using Microbanding-induced Long-period Fiber Gratings  

Sohn, Kyung-Rak (한국해양대학교 전파정보통신공학부)
Choi, Young-Gill (한국폴리텍 VI 구미대학)
Jang, Se-In (한국폴리텍 VI 구미대학)
Choi, Jae-Yun (한국폴리텍 VI 구미대학)
Shim, Joon-Hwan (한국해양대학교 전파정보통신공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.30, no.3, 2006 , pp. 449-454 More about this Journal
Abstract
We present a pressure sensor based on the mechanically induced long-period fiber gratings (LPFG) for detecting the multi-location strain variation. The theoretical analysis is performed using a graphic method for a weakly guiding step-index fiber. The calculated results are in good agreement with the experimental results. In this study, from the fact that the optical parameters of a single-mode fiber slightly differ from manufacturing company to manufacturing company, the multipoint pressure-detection sensor systems composed two identical LPFGs are realized. When the pressure is applied two LPFG sensors at once, the resonance peaks are separated as much as about 40 nm. These types of sensor systems are well suited as a multipoint monitoring of strain or temperature in the ship or the smart structure.
Keywords
Fiber optic sensors; Long-period fiber gratings; Pressure sensors; Strain-induced gratings;
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