NDLI: Optical properties of thin VO2-films at the phase transition: Design aspects for a fiber-optic thermometer

Content Provider	IEEE Xplore Digital Library
Author	Hermano, L.C.L. Lima, A.M.N. Almeida, L.A.L. Ferreira, C.L. Neff, H.
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. Eng., UFABC, Sao Paulo, Brazil (Almeida, L.A.L.) \|\| Dept. of Mater. Sci., Inst. Mil. de Eng. - IME, Urca, Brazil (Ferreira, C.L.) \|\| Dept. of Electr. Eng., Univ. Fed. de Campina Grande, Campina Grande, Brazil (Hermano, L.C.L.; Lima, A.M.N.; Neff, H.)
Abstract	The pronounced variation of the optical reflectance R of nanometer thin $VO_{2}$ films with temperature T at the phase transition recently has triggered interest in the development of compact thermo-optical sensors that utilize optical fiber technology. Its immunity against electromagnetic interference effects makes this approach suited for an optical detection of local areas with increased temperature, i.e. so called hot spots, inside of high power transformers. Optical reflectance of thin $VO_{2}-films$ as function of T throughout the hysteretic phase transition is reported in this work. A modified version of the Preisach hysteresis model is utilized, and combined with experimental optical data. Suited $VO_{2}$ film thickness values and wavelengths range for optimum sensor operation can be extracted. The achievable temperature range, as confirmed by experimental observations, is consistent with requirements that apply for power transformers of the first group, according to NBR 5416 (ABNT).
Starting Page	806
Ending Page	811
File Size	942190
Page Count	6
File Format	PDF
ISBN	9781467363860
DOI	10.1109/I2MTC.2014.6860854
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-12
Publisher Place	Uruguay
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber sensors Mathematical model Reflectivity Equations Optical fibers Temperature sensors temperature sensor vanadium oxide optical sensor
Content Type	Text
Resource Type	Article

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