Three-Wave Fiber Fabry–Pérot Interferometer for Simultaneous Measurement of Temperature and Water Salinity of Seawater

Author

Nguyen, Linh Viet ; Vasiliev, Mikhail ; Alameh, Kamal

Author_Institution

WA Centre of Excellence for MicroPhotonic Syst., Edith Cowan Univ., Joondalup, WA, Australia

Volume

23

Issue

7

fYear

2011

fDate

4/1/2011 12:00:00 AM

Firstpage

450

Lastpage

452

Abstract

We report a fiber sensor for simultaneous measurement of temperature and water salinity. The proposed sensor structure is based on a three-wave Fabry-Pérot interferometer (FPI) fabricated in a single-mode optical fiber (SMF) by focused ion beam (FIB) milling. The open cavity of the three-wave FPI was filled with water under test and used as the main sensing element and the lengths of the open and silica cavity were comparable. These features of the proposed sensor lead to three groups of interference fringes with distinct sensitivities in the wavelength domain with respect to the changes in both the water salinity and ambient temperature are obtained. Consequently, simultaneous determination of the ambient temperature and water salinity variations is achieved using the sensitivity matrix method.

Keywords

Fabry-Perot interferometers; chemical sensors; chemical variables measurement; fibre optic sensors; focused ion beam technology; milling; optical fibre fabrication; temperature measurement; fiber sensor; focused ion beam milling; interference fringe; seawater salinity measurement; sensitivity matrix method; single mode optical fiber; temperature measurement; three wave fiber Fabry-Perot interferometer; Fabry–Pérot interferometer (FPI); focused ion beam (FIB); salinity measurement; temperature measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2109057

Filename

5703107