Study of Spectral Characteristics of a Surface-bonded Fiber Bragg Grating

• Main Authors: W.Y.Li, 李文淵
• Other Authors: C.C.Cheng
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/6fq5yc

碩士 === 國立中正大學 === 機械系 === 93 === The thesis focuses on how to obtain a pre-designated optical spec-trum using a FBG with a uniform pitch surface bonded on a substrate. When the FBG-bonded substrate is subjected to a designated load, the strain will be transferred from the substrate through the bonding layer to the FBG and then produce the required optical spectrum. Several issues related to this technique are addressed, which include the influ-ence of glue on the FBG spectrum, the mechanism which compen-sates the temperature of the FBG-bonded substrate and the methodol-ogy that is used to determine the optimal shape of the substrate. Re-sults show that using a glue with a high shear modulus, increasing the bonding length and reducing the bonding layer thickness all can effec-tively improve the strain transmissibility of the bonding layer. The in-fluence of the external load on the spectral characteristics is investi-gated. Finally, a semi-empirical method is introduced to obtain the pa-rameters which characterize the FBG.