H2 sensing based on a Pd-coated tapered-FBG fabricated by DUV femtosecond laser technique

An optical fiber probe sensor based on a tapered-fiber Bragg grating (FBG) coated with 150-nm-thick Pd film is proposed for hydrogen detection. The FBG was written in a 50-mu m-diameter tapered fiber by deep ultraviolet femtosecond laser technology. A second FBG was inscribed in the 125 mu m-fiber s...

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Bibliographic Details
Main Author: Susana Silva (author)
Other Authors: Luís Coelho (author), J. M. Almeida (author), Orlando Frazão (author), José Luís Santos (author), F. X. Malcata (author), Martin Becker (author), M. Rothhardt (author), Hartmut Bartelt (author)
Format: article
Language:eng
Published: 2013
Subjects:
Engenharia electrotécnica, electrónica e informática
Electrical engineering, Electronic engineering, Information engineering
Online Access:https://hdl.handle.net/10216/104474
Country:Portugal
Oai:oai:repositorio-aberto.up.pt:10216/104474
Description
Summary:An optical fiber probe sensor based on a tapered-fiber Bragg grating (FBG) coated with 150-nm-thick Pd film is proposed for hydrogen detection. The FBG was written in a 50-mu m-diameter tapered fiber by deep ultraviolet femtosecond laser technology. A second FBG was inscribed in the 125 mu m-fiber section for temperature compensation. The sensing head was able to detect H-2 concentration in the range 0%-1% (v/v) H-2 at room temperature; a maximum sensitivity of 81.8 pm/%(v/v) H-2 was attained with temperature compensation. The influence of the Pd coating over temperature sensitivity of standard and tapered-FBGs is also presented.

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