Fibre optic pressure and temperature sensor for geothermal wells

Author

Bremer, K. ; Lewis, E. ; Leen, G. ; Moss, B. ; Lochmann, S. ; Mueller, I. ; Reinsch, T. ; Schroetter, J.

Author_Institution

Opt. Fibre Sensor Res. Centre, Univ. of Limerick, Limerick, Ireland

fYear

2010

fDate

1-4 Nov. 2010

Firstpage

538

Lastpage

541

Abstract

In this paper a fibre optic sensor is developed and tested to measure pressure and temperature under simulated wellbore conditions. The sensor consists of a miniature all-silica fibre optic Extrinsic Fabry-Perot Interferometer (EFPI) sensor which has a novel embedded Fibre Bragg Grating (FBG) reference sensor element to determine both pressure and temperature at the point of measurement. The sensor head is completely fabricated from fused-silica components, i.e. completely made of glass, utilizing a 200μm outer diameter silica glass fibre, a silica glass capillary and a Single-Mode FBG. All silica-glass components were spliced together using a conventional fusion splicer to obtain a robust sensor structure.

Keywords

Bragg gratings; Fabry-Perot interferometers; fibre optic sensors; geophysical techniques; geothermal power; optical glass; pressure measurement; pressure sensors; temperature measurement; temperature sensors; EFPI sensor; all-silica fibre optic extrinsic Fabry-Perot Interferometer sensor; fibre Bragg grating; fibre optic pressure sensor; fibre optic temperature sensor; fused-silica component; geothermal well; pressure measurement; silica glass capillary; silica glass fibre; single-mode FBG; temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2010 IEEE

Conference_Location

Kona, HI

ISSN

1930-0395

Print_ISBN

978-1-4244-8170-5

Electronic_ISBN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2010.5690125

Filename

5690125