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Proceedings Paper

Palladium coated ball lens for optical fibre refractometry based hydrogen sensing
Author(s): Sahar A. Chowdhury; Ricardo Correia; Daniel Francis; Simon J. Brooks; Ben J. S. Jones; Alexander W. J. Thompson; Jane Hodgkinson; Ralph P. Tatam
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Paper Abstract

An optical fibre refractometer using a ball lens as a sensor head has been developed and characterised. Light from a superluminescent diode is directed to an optical fibre sensor head and the intensity of the returned beam gives a measure of the refractive index of the medium at the ball lens fibre tip. A second beam is used to reference the intensity measurements. The system is capable of detecting changes in refractive index with a resolution of 0.003 RIU. The ball lenses have been coated with an 80nm thick layer of palladium and the potential use of this system as a micromirror hydrogen sensor is demonstrated. This technique offers a simple sensor head arrangement, with a large signal sampling area compared with that of a bare fibre.

Paper Details

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 9157AP (2 June 2014); doi: 10.1117/12.2059604
Show Author Affiliations
Sahar A. Chowdhury, Cranfield Univ. (United Kingdom)
Ricardo Correia, Cranfield Univ. (United Kingdom)
Daniel Francis, Cranfield Univ. (United Kingdom)
Simon J. Brooks, AWE plc (United Kingdom)
Ben J. S. Jones, AWE plc (United Kingdom)
Alexander W. J. Thompson, AWE plc (United Kingdom)
Jane Hodgkinson, Cranfield Univ. (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)

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