Title :
Strain and temperature characterisation of sensing head based on suspended-core fibre in Sagnac interferometer
Author :
Frazao, Orlando ; Baptista, Jose Manuel ; Santos, Jose Luis ; Kobelke, Jens ; Schuster, Kay
Author_Institution :
INESC Porto, Porto
Abstract :
The study of the strain and temperature characteristics of a sensing head based on a four-hole suspended-core fibre in a Sagnac interferometric configuration is reported. It is shown that, for the case of using an uncoated suspended-core fibre, a relatively large strain sensitivity is obtained (sime1.94 pm/muepsiv), while the temperature sensitivity is small (sime0.29 pm/degC), pointing to a temperature-independent strain sensor. When the fibre is coated, the strain sensitivity remains essentially the same, while the temperature sensitivity becomes much larger and with a value that changes with the localisation of the temperature variation range.
Keywords :
Sagnac interferometers; fibre optic sensors; optical fibre cladding; optical fibre testing; strain sensors; temperature sensors; Sagnac interferometer; strain sensitivity; strain sensor; suspended-core fibre; temperature sensitivity;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081431