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Adhesive based Fabry-Pérot hydrostatic pressure sensor with improved and controlled sensitivity

Oliveira, R. ; Bilro, L. ; Nogueira, R.N. ; Rocha, Ana M.

Journal of Lightwave Technology Vol. 37, Nº 9, pp. 1909 - 1915, January, 2019.

ISSN (print): 0733-8724
ISSN (online):

Journal Impact Factor: 2,567 (in 2015)

Digital Object Identifier: 10.1109/JLT.2019.2894949

Abstract
In this work we demonstrate both numerically and experimentally, the capability to control and enhance the hydrostatic pressure sensitivity of an adhesive based Fabry Perot (FP) sensor. The fiber sensor consists of a polymerized resin in between two single-mode fiber terminals that act as low reflectance mirrors. The theoretically evaluation of the proposed sensor, showed that the strain in the region between the fiber end faces increases with increasing dimensions of the resin structure surrounding the inner FP cavity. Experimentally, the photopolymerizable resin was added in layers, increasing the structure dimensions, allowing to improve the hydrostatic pressure sensitivity from 102 to 475 pm/MPa, for the cavity filled with resin just in between the fiber end faces and for the cavity covered with several layers of resin, respectively. The sensor fabrication is simple and cost effective, allowing an easy and affordable way to control and enhance the hydrostatic pressure sensitivity of resin based Fabry-Pérot sensors.