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

Show simple item record Chowdhury, Sahar A. Correia, Ricardo N. Francis, Daniel Brooks, Simon J. Jones, Benjamin J. S. Thompson, Alexander W. J. Hodgkinson, Jane Tatam, Ralph P. 2016-03-17T12:23:18Z 2016-03-17T12:23:18Z 2015-06-15
dc.identifier.citation S. A. Chowdhury et al. 2015, An optical fiber hydrogen sensor using a palladium-coated ball lens, Journal of Lightwave Technology, Vol. 33, Iss. 12, pp2535-2542 en_UK
dc.identifier.issn 0733-8724
dc.description.abstract A 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.language.iso en en_UK
dc.publisher Institute of Electrical and Electronics Engineers en_UK
dc.subject Hydrogen en_UK
dc.subject Hydrogen instrumentation en_UK
dc.subject Optical fiber application en_UK
dc.subject Palladium en_UK
dc.subject Refractive index en_UK
dc.subject Refractometer en_UK
dc.subject Sensor en_UK
dc.title An optical fiber hydrogen sensor using a palladium-coated ball lens en_UK
dc.type Article en_UK

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