17 December 2015 Planar waveguide sensor of ammonia
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Proceedings Volume 9816, Optical Fibers and Their Applications 2015; 98160T (2015) https://doi.org/10.1117/12.2222518
Event: 16th Conference on Optical Fibers and Their Applications, 2015, Lublin and Naleczow, Poland
Abstract
The paper presents the concept of forming ammonia sensor based on a planar waveguide structure. It is an amplitude sensor produced on the basis of the multimode waveguide. The technological base for this kind of structure is the ion exchange method and the sol-gel method. The planar multimode waveguide of channel type is produced in glass substrate (soda-lime glass of Menzel-Glaser company) by the selective Ag+↔Na+ ion exchange. On the surface of the glass substrate a porous (~40%) silica layer is produced by the sol-gel method. This layer is sensitized to the presence of ammonia in the surrounding atmosphere by impregnation with Bromocresol Purple (BCP) dye. Therefore it constitutes a sensor layer. Spectrophotometric tests carried out showed about 50% reduction of cross-transmission changes of such sensor layer for a wave λ=593 nm caused by the presence of 25% ammonia water vapor in its ambience. The radiation source used in this type of sensor structure is a light emitting diode LED. The gradient channel waveguide is designed for frontal connection (optical glue) with a standard multimode telecommunications waveguide 62.5/125μm.
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Roman Rogoziński, Roman Rogoziński, Cuma Tyszkiewicz, Cuma Tyszkiewicz, Paweł Karasiński, Paweł Karasiński, Weronika Izydorczyk, Weronika Izydorczyk, "Planar waveguide sensor of ammonia ", Proc. SPIE 9816, Optical Fibers and Their Applications 2015, 98160T (17 December 2015); doi: 10.1117/12.2222518; https://doi.org/10.1117/12.2222518
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