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Title: | Determination of phase jumps in the measurement of phase velocity of samples obeying a frequency power-law attenuation coefficient using Kramers-Kronig relations. |
Authors: | Elvira, Luis Tiago, Marcelo Moreira Yoza, Suelen Akemi Nakazato Kitano, Claudio Higuti, Ricardo Tokio |
Keywords: | Phase velocity Kramers-Kronig relations Phase jumps |
Issue Date: | 2020 |
Citation: | ELVIRA, 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. |
Abstract: | Ultrasonic 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. |
URI: | http://www.repositorio.ufop.br/jspui/handle/123456789/14584 |
metadata.dc.identifier.uri2: | https://ieeexplore.ieee.org/document/8986679 |
metadata.dc.identifier.doi: | https://doi.org/10.1109/TUFFC.2020.2972436 |
ISSN: | 1525-8955 |
Appears in Collections: | DEELT - Artigos publicados em periódicos |
Files in This Item:
File | Description | Size | Format | |
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ARTIGO_DeterminationPhaseJumps.pdf Restricted Access | 806,07 kB | Adobe PDF | View/Open |
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