Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/90545
Type: Artigo de periódico
Title: Ultrahigh-sensitivity Temperature Fiber Sensor Based On Multimode Interference
Author: Silva S.
Pachon E.G.P.
Franco M.A.R.
Hayashi J.G.
Malcata F.X.
Frazao O.
Jorge P.
Cordeiro C.M.B.
Abstract: The proposed sensing device relies on the self-imaging effect that occurs in a pure silica multimode fiber (coreless MMF) section of a single-mode-multimode-single-mode (SMS)-based fiber structure. The influence of the coreless-MMF diameter on the external refractive index (RI) variation permitted the sensing head with the lowest MMF diameter (i.e., 55 7mu;m) to exhibit the maximum sensitivity (2800 nm/RIU). This approach also implied an ultrahigh sensitivity of this fiber device to temperature variations in the liquid RI of 1.43: a maximum sensitivity of-1880 pm/°C was indeed attained. Therefore, the results produced were over 100-fold those of the typical value of approximately 13 pm/°C achieved in air using a similar device. Numerical analysis of an evanescent wave absorption sensor was performed, in order to extend the range of liquids with a detectable RI to above 1.43. The suggested model is an SMS fiber device where a polymer coating, with an RI as low as 1.3, is deposited over the coreless MMF; numerical results are presented pertaining to several polymer thicknesses in terms of external RI variation. © 2012 Optical Society of America.
Editor: Optical Society of American (OSA)
Rights: fechado
Identifier DOI: 10.1364/AO.51.003236
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84861833107&partnerID=40&md5=fba9a456e97865307dae13344dc3efe0
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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