Interferometric fiber-optic bending / nano-displacement sensor using plastic dual-core fiber
Abstract
We demonstrate an interferometric fiber-optic bending/micro-displacement sensor based on a plastic dual-core fiber with one end coated with a silver mirror. The two fiber cores are first excited with the same laser beam, the light in each core is then back-reflected at the mirror-coated fiber-end, and, finally, the light from the two cores is made to interfere at the coupling end. Bending of the fiber leads to shifting interference fringes that can be interrogated with a slit and a single photodetector. We find experimentally that the resolution of our bending sensor is ~3x10-4 m-1 for sensing of bending curvature, as well as ~70 nm for sensing of displacement of the fiber tip. We demonstrate operation of our sensor using two examples. One is weighting of the individual micro-crystals of salt, while the other one is monitoring dynamics of isopropanol evaporation.
Cite
@article{arxiv.1403.0892,
title = {Interferometric fiber-optic bending / nano-displacement sensor using plastic dual-core fiber},
author = {H. Qu and G. F. Yan and M. Skorobogatiy},
journal= {arXiv preprint arXiv:1403.0892},
year = {2015}
}