Gas Refractometer Based on Optical Fiber Extrinsic Fabry—Perot Interferometer With Open Cavity

Author

Ruohui Wang ; Xueguang Qiao

Author_Institution

Sch. of Phys., Northwest Univ., Xi´an, China

Volume

27

Issue

3

fYear

2015

fDate

Feb.1, 1 2015

Firstpage

245

Lastpage

248

Abstract

In this letter, we proposed a gas refractometer based on optical fiber Fabry-Perot interferometer with an open cavity. The Fabry-Perot cavity is a short section capillary tube spliced between a single-mode fiber and a side-hole fiber (SHF). The unique cladding of the SHF enables gas entering or leaving the Fabry-Perot cavity freely. The measurement of pressure-induced refractive index change of nitrogen gas has been demonstrated by monitoring the wavelength shift of the interference pattern. The robust and microsize architecture make the interferometer a good candidate for gas sensing applications.

Keywords

Fabry-Perot interferometers; fibre optic sensors; gas sensors; nitrogen; optical fibre cladding; refractive index measurement; refractometers; Fabry-Perot cavity; N₂; SHF cladding; gas refractometer; gas sensing applications; interference pattern; microsize architecture; nitrogen gas; open cavity; optical fiber Fabry-Perot interferometer; optical fiber extrinsic Fabry-Perot interferometer; pressure-induced refractive index change measurement; short section capillary tube; side-hole fiber; single-mode fiber; wavelength shift; Cavity resonators; Electron tubes; Optical fiber sensors; Optical fibers; Refractive index; Fabry-Perot interferometers; Optical fiber devices; Optical fiber devices,; Refractive index measurement; refractive index measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2365812

Filename

6942153