Highly Integrated FP/FBG Sensor for Simultaneous Measurement of High Temperature and Strain

Author

Qin Liu ; Zeng Ling Ran ; Yun Jiang Rao ; Shu Cheng Luo ; Hui Qin Yang ; Ya Huang

Author_Institution

Key Lab. of Opt. Fiber Sensing & Commun., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

26

Issue

17

fYear

2014

fDate

Sept.1, 1 2014

Firstpage

1715

Lastpage

1717

Abstract

An inline fiber-optic micro-Fabry-Perot (MFP) cavity and a short fiber Bragg grating (SFBG) is overlapped to form an integrated MFP/SFBG sensor for simultaneous measurement of temperature and strain under high temperature (300 °C). The FP cavity is fabricated on a GeO₂-doped photon sensitive fiber using the 157-nm laser micromachining technique and the SFBG is written at the same position of the MFP cavity using the standard 248-nm laser method. As the MFP cavity and SFBG have different sensitivity coefficients to temperature and strain, they can be utilized for realization of simultaneous measurement of dual parameters.

Keywords

Bragg gratings; fibre optic sensors; germanium compounds; integrated optics; laser beam machining; micro-optics; microcavities; micromachining; microsensors; strain measurement; strain sensors; temperature measurement; temperature sensors; GeO₂-doped photon sensitive fiber; MFP cavity; SFBG; high temperature measurement; inline fiber-optic microFabry-Perot cavity; integrated FP-FBG sensor; laser micromachining technique; sensitivity coefficients; short fiber Bragg grating; strain measurement; temperature 300 degC; wavelength 157 nm; wavelength 248 nm; Cavity resonators; Optical fiber sensors; Optical fibers; Strain; Strain measurement; Temperature measurement; Temperature sensors; FBG; High temperature; laser micromachining; micro cavity; simultaneous measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2331359

Filename

6844835