Abstract
ABSTRACTThe mechanical and optical interaction of an optical fiber strain sensor whichis structurally embedded in a monolithic host material is explored with closed formsolutions, finite element methods, and fiber interferometry. A stripped single mode optical fiber is embedded in a four point bend specimen to investigate both the stress state induced in the specimen by the fiber acting as an elastic inclusion, and the phase shift induced in the optical fiber by the specimen strain field. Generalized plane strain elasticity solutions are combined with a three-dimensional phase-strain model developed for embedded sensors to predict the strain induced optical retardation of the light propagating in the fiber sensor. Comparisons toexperimental data and Butter and Hocker's [1] theory are provided. The closed formsolutions are used in conjunction with finite element solutions to investigate thelocal stress state induced by the presence of the fiber. 1 . INTRODUCTION The recent emphasis in intelligent structures has been to identify and
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