Speaker
Prof.
Pasquale Arpaia
(Università del Sannio)
Description
Magnetism and magnetic materials constitute a fascinating and challenging subject
of investigation, playing a role in several branches of science and technology, as
well as in advanced accelerators for subnuclear basic research. The theoretical
description of ferromagnetic hysteresis and its rooting in the involved physical
mechanisms exhibit several fundamental interpretative aspects, not yet completely
understood. The physical understanding of magnetic materials properties always
poses new challenges to scientists. Therefore, it is important to have the
possibility of using measurement instrumentation capable of analyzing their
characteristics. The target of this work is the dynamic characterization of
ferromagnetic material magnets by analytical modeling and experimental measuring
magnetic-field phase spectrum by a fully digital approach.
This work is composed by four parts. First, the proposed measurement method is
shown by analytically modeling the dynamic nonlinearity in an hysteretic and a non-
hysteretic component related to the magnetic field phase spectrum. This allows the
dynamic behavior of the magnet to be characterized and its dynamic hysteretic
transfer characteristic to be identified. In the third part, a set of digital
simulation are realized, aimed at characterizing the measurement method and the
proposed model by simuling a ferromagnetic material with a hysteretic dynamic
behaviour. Then, performance of the proposed method is compared with traditional
methods. In the fourth part, in reference to standard methods, the proposed model
is validated and the measurement method is characterized experimentally.
BIBLIOGRAFIA
P. Arpaia, A. M. Da Cruz Serra, P. Da Ponte, C. Libano Monteiro “A critical note to
IEEE 1057-94 standard on hysteretic ADC dynamic testing”, IEEE Transactions on
Instrumentation and Measurement, Vol. 50, No. 4, August 2000.
P. Arpaia, C. Monteiro Libano, A. M. Da Cruz Serra "A Comprehensive Phase-Spectrum
Approach to Metrological Characterization of Hysteretic ADCs", IEEE Transactions on
Instrumentation and Measurement, Vol. 51, No. 4, pp. 756 - 763, August, 2002 .
Author
Prof.
Pasquale Arpaia
(Università del Sannio)
