Abstract

This Letter reports a polymer optical fiber (POF) based large strain sensor based on the multimode interference (MMI) theory for the application of structural health monitoring. A section of POFs is sandwiched between two silica single mode fibers to construct a single-mode-multimode-single-mode structure that produces a MMI spectrum. The strain sensing mechanism of the device was investigated and experimentally verified. A large dynamic range of $2\times {10}^4\mathrm{\mu \epsilon }$ (2%) and a detection limit of 33 µε have been demonstrated.

© 2012 Optical Society of America

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