Graphene oxide-based optical waveguide for moisture sensing in transformer oil

Karthikeyan, S. and Mezher, Mezher H. and Ibrahim, Fatimah and Vigneswaran, Dhasarathan and Amiri, Iraj Sadegh and Zakaria, Rozalina (2019) Graphene oxide-based optical waveguide for moisture sensing in transformer oil. Photonics and Nanostructures - Fundamentals and Applications, 36. p. 100727. ISSN 1569-4410, DOI

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We report on moisture detection in transformer oil based on an optical waveguide fabricated using graphene oxide (GO). The SU-8 polymer channel waveguide was coated by GO film, using a drop-casting technique. Here, for the polarized light, high absorption of transverse electric (TE) was achieved for the proposed sensor at wavelength 1550 nm. Changes in TE-polarized light absorption by the device were measured at varying water contents. Experiments were carried out for water contents in oil in the range of 16–21 ppm as well as immiscible (free) water in oil. Our observations showed a difference in the results trend obtained for different relative water contents. The TE-transmission power increased linearly with higher water content in transformer oil. A power change of +0.90 dB/ppm of water content in transformer oil was measured within the range tested. A simulation analysis using the finite element method FEM was also carried out. The proposed sensing mechanism can be used under these sensing conditions. This approach also has a fast response time as well as high sensitivity. © 2019 Elsevier B.V.

Item Type: Article
Funders: University of Malaya Flagship Grant ( FL001A-14AET and FL001C-14AET ) and a PPP Grant ( PG012-2015B )
Uncontrolled Keywords: Graphene oxide; Planar waveguide; Transformer oil
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
R Medicine
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 13 Apr 2020 06:58
Last Modified: 13 Apr 2020 06:58

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