Determination of phase jumps in the measurement of phase velocity of samples obeying a frequency power-law attenuation coefficient using Kramers-Kronig relations.

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dc.contributor.authorElvira, Luis
dc.contributor.authorTiago, Marcelo Moreira
dc.contributor.authorYoza, Suelen Akemi Nakazato
dc.contributor.authorKitano, Claudio
dc.contributor.authorHiguti, Ricardo Tokio
dc.date.accessioned2022-02-25T15:38:17Z
dc.date.available2022-02-25T15:38:17Z
dc.date.issued2020pt_BR
dc.description.abstractUltrasonic phase velocity spectroscopy is a very sensitive technique used in the measurement of material properties. In phase velocity calculation, ambiguities can arise in the spectral phases, in the form of integer multiples of 2π rad, which, if not corrected, result in large errors. In this work we propose a method for determining these ambiguities, more specifically, the number of 2π rad phase jumps, using KramersKronig relations, for samples exhibiting a frequency power-law attenuation coefficient. The method is based on a first estimate of the phase velocity from group velocity and attenuation coefficient, which are not affected by phase jumps. This estimated phase velocity is used to obtain the number of 2π rad phase jumps, which in turn is used to calculate the corrected phase velocity. The method was tested with samples of liquids with frequency power-law attenuation coefficient (exponent y varying from 1.5 to 2) and a solid (PMMA - polymethyl methacrylate) with y ∼ 1, and velocity dispersions ranging from 0 to 34 (cm/s)/MHz.pt_BR
dc.identifier.citationELVIRA, L. et al. Determination of phase jumps in the measurement of phase velocity of samples obeying a frequency power-law attenuation coefficient using Kramers-Kronig relations. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, v. 67, n. 7, 2020. Disponível em: <https://ieeexplore.ieee.org/document/8986679>. Acesso em: 12 set. 2021.pt_BR
dc.identifier.doihttps://doi.org/10.1109/TUFFC.2020.2972436pt_BR
dc.identifier.issn1525-8955
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/14584
dc.identifier.uri2https://ieeexplore.ieee.org/document/8986679pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectPhase velocitypt_BR
dc.subjectKramers-Kronig relationspt_BR
dc.subjectPhase jumpspt_BR
dc.titleDetermination of phase jumps in the measurement of phase velocity of samples obeying a frequency power-law attenuation coefficient using Kramers-Kronig relations.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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