Fibre optic sensors based on hollow capillary tube with three tightly encapsulated optical fibres

Abstract

Fibre optic sensor cable technology is relatively a new research area that combines a set of scientific and technical disciplines in order to meet distributed sensor system needs and quality standards. In this paper, we discuss a fibre optic sensor design with three tightly encapsulated fibres for multipurpose and multivalent sensing. It has the potential to integrate more detection and measurement techniques into a small space, and this, in turn, largely contributes to installation and cost optimizations and directly impacts investment plans and industrial success. The developed cable is tested in a specially developed high pressure and high temperature chamber. Furthermore, it is demonstrated that the proposed sensor cable offers the possibility of detection and distributed measurement of temperature, pressure, bending and vibrations.

Keywords

• Optical fibre
• fibre optic measurements
• monitoring systems
• fully distributed optical fibre sensor
• acoustic sensors
• strain sensors
• temperature sensors
• pressure sensors
• Brillouin effect
• Brillouin Optical Time Domain Analysis (BOTDA)