This paper presents a protection method with FBG sensor in a 7-wire steel strand for improving measurement range of the sensor. For this purpose, both polyimide tube and teflon tube are employed to protect the FBG sensor. Uniaxial tests are carried out to compare their performances with those without the protection. The comparison showed that (1) maximum measurable deformation strain of the FBG-encapsulated strand with the polyimide tube enhancement is superior to the strand without the protection, (2) and it can measure effective strain larger than 1.00% without slip around the FBG sensor while there may occur the slip in the strand with teflon tube.

• 최송이(전남대학교 대학원 건설환경공학과, 석사과정) | Choi, Song I
• 김철민(전남대학교 대학원 건설환경공학과, 석사과정) | Kim, Chul Min
• 김재민(전남대학교 해양토목공학과 교수, 공학박사) | Kim, Jae Min