The Use of Kramers-Kronig Relations for Verification of Quality of Ferrite Magnetic Spectra

Autor: Juris Grizans, Tatjana Solovjova, Nikolajs Ponomarenko
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: The Scientific Journal of Riga Technical University-Electrical, Control and Communication Engineering; Vol 9 (2015): The Scientific Journal of Riga Technical University-Electrical, Control and Communication Engineering; 30-35
Electrical, Control and Communication Engineering, Vol 9, Iss 1, Pp 30-35 (2015)
ISSN: 2255-9140
2255-9159
Popis: The complex initial permeability (CIP) as a function of frequency is one of the main properties of ferrites. This characteristic (CIP) is measured experimentally, therefore there can be found noisy, doubtful or incomplete parts of the spectrum. Thus there is a need for a method of evaluation of quality of CIP. In this article for evaluation of the quality of experimental CIP spectra of polycrystalline ferrite materials the KKR (Kramers-Kronig relations) are used. In order to apply KKR to experimentally measured data (i.e. data with finite limits) the method of transforming these integral relations into summation relations with finite limits is developed and described. This method can be used only for CIP given over the wide frequency rage, so that the imaginary part of CIP is fully presented. Using KKR with the help of CIP spectra model (based on the effects coming from polycrystal grain sizes and defects distribution) partly removes aforementioned limit. Thus with the help of the model we can also make CIP spectra reconstruction (in cases when CIP is noisy or incomplete) and CIP spectra decomposition.
Databáze: OpenAIRE
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