Development of FBG Sensor for Static Stress.pdfVIP

Development of FBG Sensor for Static Stress 1 2 2 3 2 Hyuntae Kim , Yumi Kim , Jingyu Do , Jangsik Park , Yunsik Yu 1 Department of Multimedia Engineering, Dongeui University Gaya-dong, San 24, Busanjin-ku, Busan, 614-714, Korea htaekim@deu.ac.kr 2 Convergence of IT Devices Institute Busan, Dongeui University Gaya-dong, San 24, Busanjin-ku, Busan, 614-714, Korea {yumi, mhilt767, ysyu}@deu.ac.kr 3 Department of Electronics Engineering, Kyungsung University, Daeyeon3-dong, 110-1, Nam-gu, Busan, 608-736, Korea jsipark@ks.ac.kr Abstract. In this paper, we manufacture Fiber Bragg Grating(FBG) sensor and study its applying to the structure deformation measurement. FBGs are manufactured using the 248nm excimer laser and phase masks. To enhance the photosensitivity of the core, we have loaded Hydrogen in the fiber. Then its reflectivity has improved about 8 dB. Experimental results for static stress based on comparative measurements with electric strain gauge sensors installed on the structure show that FBGs can be replaced the electric strain gauge sensors. Keywords: FBG sensor, Electric strain gauge, Structure deformation Measurement, Cantilever displacement. 1 Introduction Recently, FBG has been accepted widely throughout the civil infrastructures, espe- cially for bridges [1-3]. A new case study, FBG-based intelligent monitoring system of the Tianjin Yonghe Bri