Ammonia sensing using a fibre optic long period grating with a porous nanostructured coating formed from silica nanospheres

S. Korposh; W. Batty; S. Kodaira; S.-W. Lee; S. W. James; S. M. Topliss; R. P. Tatam

doi:10.1117/12.866326

8 September 2010 Ammonia sensing using a fibre optic long period grating with a porous nanostructured coating formed from silica nanospheres

S. Korposh, W. Batty, S. Kodaira, S.-W. Lee, S. W. James, S. M. Topliss, R. P. Tatam

Author Affiliations +

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76531D (2010) https://doi.org/10.1117/12.866326
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

Abstract

The transmission spectrum of a fibre optic long period grating (LPG) coated with a porous multilayer coating of thickness of order 400 nm formed from silica nanospheres is shown to exhibit a strong sensitivity to the infusion of a functional, chemically sensitive material into the coating. Subsequently, the transmission spectrum of the LPG shows sensitivity to changes in the properties of the functional material when exposed to a particular chemical species in an aqueous solution. The operation of such a device as an ammonia sensor is demonstrated, exhibiting 1 ppm sensitivity. The sensing mechanisms are discussed.

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S. Korposh, W. Batty, S. Kodaira, S.-W. Lee, S. W. James, S. M. Topliss, and R. P. Tatam "Ammonia sensing using a fibre optic long period grating with a porous nanostructured coating formed from silica nanospheres", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76531D (8 September 2010); https://doi.org/10.1117/12.866326

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