Fiber optic accelerometer using two-mode fibers with an off-center core

Osni Lisboa; C. A. S. de Oliveira; Cheng-Kuei Jen; J. Edimar B. Oliveira; Sergio F. M. Almeida; Sidney L.A. Carrara

doi:10.1117/12.141306

26 March 1993 A fiber optic accelerometer using two-mode fibers with an off-center core

Osni Lisboa, C. A. S. de Oliveira, Cheng-Kuei Jen, J. Edimar B. Oliveira, Sergio F. M. Almeida, Sidney L.A. Carrara

Proceedings Volume 1798, Fiber Optic Smart Structures and Skins V; (1993) https://doi.org/10.1117/12.141306
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

The sensing mechanism of an optical fiber accelerometer based on the interaction between the frequency shifted two modes in a two-mode fiber with an off-center core is presented. When the fiber is bent, by the action of an acceleration in a specific direction, due to the asymmetry induced by the off-center core, there exists a preferential net strain. The bending causes a tension or a compression field in the fiber and provides a positive or negative acceleration, respectively. The frequency shift is achieved by an collinear acousto-optic interaction in the two-mode fiber. We show both theoretical analysis and experimental results. Several approaches which can enhance the sensitivity are also provided.

Citation Download Citation

Osni Lisboa, C. A. S. de Oliveira, Cheng-Kuei Jen, J. Edimar B. Oliveira, Sergio F. M. Almeida, and Sidney L.A. Carrara "A fiber optic accelerometer using two-mode fibers with an off-center core", Proc. SPIE 1798, Fiber Optic Smart Structures and Skins V, (26 March 1993); https://doi.org/10.1117/12.141306

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