CAP - Other Publications

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Browsing CAP - Other Publications by Author "José Almeida"
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    H-2 Sensing Based on a Pd-Coated Tapered-FBG Fabricated by DUV Femtosecond Laser Technique
    ( 2013) Susana Oliveira Silva ; Luís Carlos Coelho ; José Almeida ; Orlando Frazão ; José Luís Santos ; Malcata,FX ; Becker,M ; Rothhardt,M ; Bartelt,H
    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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