title: Fabry-Perot cavity based on silica tube for strain sensing at high temperatures.
abstract: In this work, a Fabry-Perot cavity based on a new silica tube design is proposed. The tube presents a cladding with a thickness of ~14 μm and a hollow core. The presence of four small rods, of ~20 μm diameter each, placed in diametrically opposite positions ensure the mechanical stability of the tube. The cavity, formed by splicing a section of the silica tube between two sections of single mode fiber, is characterized in strain and temperature (from room temperature to 900 °C). When the sensor is exposed to high temperatures, there is a change in the response to strain. The influence of the thermal annealing is investigated in order to improve the sensing head performance.
authors.forename: Marta S
authors.initials: MS
authors.lastname: Ferreira
authors.forename: Paulo
authors.initials: P
authors.lastname: Roriz
authors.forename: Jörg
authors.initials: J
authors.lastname: Bierlich
authors.forename: Jens
authors.initials: J
authors.lastname: Kobelke
authors.forename: Katrin
authors.initials: K
authors.lastname: Wondraczek
authors.forename: Claudia
authors.initials: C
authors.lastname: Aichele
authors.forename: Kay
authors.initials: K
authors.lastname: Schuster
authors.forename: José L
authors.initials: JL
authors.lastname: Santos
authors.forename: Orlando
authors.initials: O
authors.lastname: Frazão