Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 25, Issue 4, Pages 401-403Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2013.2239985
Keywords
Femtosecond laser technique; fiber Bragg grating; hydrogen sensor; palladium; pressure
Funding
- COST Action [TD1001]
- Project MICROPHYTE [PTDC/EBB-EBI/102728/2008]
- EU
- Portuguese State (FCT, Portugal)
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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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