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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Determination of Phase Jumps in the Measurement of Phase Velocity of Samples Obeying a Frequency Power-Law Attenuation Coefficient Using Krames-Krong Relations

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Author(s):
Elvira, Luis [1] ; Tiago, Marcelo Moreira [2] ; Yoza, Suelen A. N. [3] ; Kitano, Claudio [3] ; Higuti, Ricardo Tokio [3]
Total Authors: 5
Affiliation:
[1] CSIC, Inst Tecnol Fis & Informac, Madrid 28006 - Spain
[2] Fed Univ Ouro Preto UFOP, Inst Exact & Appl Sci ICEA, Dept Elect Engn, BR-35931008 Joao Monlevade - Brazil
[3] Sao Paulo State Univ UNESP, Sch Engn Ilha Solteira, BR-15385000 Ilha Solteira - Brazil
Total Affiliations: 3
Document type: Journal article
Source: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL; v. 67, n. 7, p. 1438-1447, JUL 2020.
Web of Science Citations: 0
Abstract

Ultrasonic phase velocity spectroscopy is a very sensitive technique used in the measurement of material properties. In a phase velocity calculation, ambiguities can arise in the spectral phases, in the form of integer multiples of 2 pi rad, which, if not corrected, results in large errors. In this work, we propose a method for determining these ambiguities, more specifically, the number of 2 pi rad phase jumps, using the Kramers-Kronig 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 that are not affected by phase jumps. This estimated phase velocity is used to obtain the number of 2 pi rad phase jumps, which in turn is used to calculate the corrected phase velocity. The method was tested with samples of liquids with a frequency power-law attenuation coefficient (exponent y varying from 1.5 to 2) and a solid {[}polymethyl methacrylate (PMMA)] with y similar to 1, and velocity dispersions ranging from 0 to 34 (cm/s)/MHz. (AU)

FAPESP's process: 14/09034-8 - Measurement of properties of liquids using high-frequency ultrasound
Grantee:Ricardo Tokio Higuti
Support Opportunities: Regular Research Grants
FAPESP's process: 14/09038-3 - Methods for the characterization of liquids using ultrasound
Grantee:Ricardo Tokio Higuti
Support Opportunities: Research Grants - Visiting Researcher Grant - International