An optical fiber hydrogen sensor using a palladium-coated ball lens

dc.contributor.authorChowdhury, Sahar A.
dc.contributor.authorCorreia, Ricardo N.
dc.contributor.authorFrancis, Daniel
dc.contributor.authorBrooks, Simon J.
dc.contributor.authorJones, Benjamin J. S.
dc.contributor.authorThompson, Alexander W. J.
dc.contributor.authorHodgkinson, Jane
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2016-03-17T12:23:18Z
dc.date.available2016-03-17T12:23:18Z
dc.date.issued2015-06-15
dc.description.abstractA self-referenced optical fiber refractometer using a ball lens as a sensor head has been developed and characterized. A 350-μm ball lens created at the tip of a single mode fiber has been coated with a 40-nm optically thin layer of palladium that reacts with hydrogen to form a hydride, which has a lower reflectivity than pure palladium. Optical reflectance measurements from the tip of the ball lens were performed to determine the hydrogen response. The change in reflectivity is proportional to the hydrogen concentration in the range 0% to 1% hydrogen in air with a detection limit down to 10 ppm (1σ) in air. This technique offers a simple sensor head arrangement, with a larger sampling area (~40 times) than a typical single-mode fiber core. A statistical image analysis of a palladium film, with cracks created by accelerated failure, confirms that the anticipated sensor area for a ball lens sensor head has a more predictable reflectivity than that of a bare fiber core.en_UK
dc.identifier.citationChowdhury SA, Correia RN, Francis D, et al., (2015) An optical fiber hydrogen sensor using a palladium-coated ball lens. Journal of Lightwave Technology, Volume 33, Issue 12, June 2015, pp. 2535-2542en_UK
dc.identifier.cris1726558
dc.identifier.issn0733-8724
dc.identifier.urihttp://dx.doi.org/10.1109/JLT.2014.2384203
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/9794
dc.language.isoenen_UK
dc.publisherInstitute of Electrical and Electronics Engineersen_UK
dc.subjectHydrogenen_UK
dc.subjectHydrogen instrumentationen_UK
dc.subjectOptical fiber applicationen_UK
dc.subjectPalladiumen_UK
dc.subjectRefractive indexen_UK
dc.subjectRefractometeren_UK
dc.subjectSensoren_UK
dc.titleAn optical fiber hydrogen sensor using a palladium-coated ball lensen_UK
dc.typeArticleen_UK

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