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Mechanical Strength Characteristics of Fiber Bragg Gratings with Fabrication Process  

Park S. O. (한국과학기술원 기계공학과 항공우주공학전공)
Kim C. G. (한국과학기술원 기계공학과 항공우주공학전공)
Kang D. H. (한국철도기술연구원 남북철도기술개발사업단)
Publication Information
Composites Research / v.18, no.1, 2005 , pp. 16-22 More about this Journal
Abstract
Application fields on structural health monitoring of fiber Bragg gratings (FBGs) are gradually expanded even to a primary structure as well as a secondary structure and a specimen. For the reason, verification for the reliability of FBGs such as signal characteristics and mechanical strength becomes much more important. In this study, mechanical strength characteristics of FBGs with their fabrication process and reflectivity are investigated with various grating lengths. From the results of tension tests, it is shown that the mechanical strength of optical fibers decreases about $50\%$ just by jacket stripping and the amount of decrease is dependent on stripping methods. About $55\%$ of mechanical strength of stripped optical fibers decreases if gratings are formed in the core and it is regardless of grating lengths and reflectivity. However, the width of strength distribution increases relative to increases in reflectivity.
Keywords
fiber Bragg grating; grating length; mechanical strength; reflectivity;
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