8 September 2010 H2 sensing performance of optical fibers coated with WO3 film
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Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76530N (2010) https://doi.org/10.1117/12.866420
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal
Abstract
Optical gas sensing performance of optical fibers coated with sputtered Pd/WO3 films was investigated for low concentration H2 sensing. This optical fiber H2 sensor was prepared by RF sputtering of WO3 on the tip of the multimode fiber at 260°C and subsequently depositing a Pd catalytic layer. Highly uniform nanotextured film, with individual crystallites having diameters in the range of 35-50 nm was observed. The sensing mechanism was based on the reflectance change of Pd/WO3 layers towards H2 reliant on the gasochromic effect. Under the conditions of different sensing layer thicknesses and different operating temperatures, full Vis-NIR spectra investigations were carried out during the sensor testing. It was found that the optical fiber H2 sensor coated with Pd/WO3 film show a remarkable optical reflectance response towards H2 concentrations as low as 0.06%. The optimum sensing layer thickness was 200 nm and the optimum operating temperature was found to be 100°C.
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J. Ou, M. H. Yaacob, M. Breedon, K. Kalantar-Zadeh, W. Wlodarski, "H2 sensing performance of optical fibers coated with WO3 film", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530N (8 September 2010); doi: 10.1117/12.866420; https://doi.org/10.1117/12.866420
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