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Microwave measurement system for dispersive dielectric properties of densely packed pellets

Livia Cerullo (Institutionen för signaler och system, Signalbehandling) ; Johan Winges (Institutionen för signaler och system, Signalbehandling) ; Thomas Rylander (Institutionen för signaler och system, Signalbehandling) ; Tomas McKelvey (Institutionen för signaler och system, Signalbehandling) ; Lubomir Gradinarsky ; Staffan Folestad ; Mats Viberg (Institutionen för signaler och system, Signalbehandling)
Measurement: Journal of the International Measurement Confederation (02632241). Vol. 106 (2017), p. 179-189.
[Artikel, refereegranskad vetenskaplig]

We present a microwave measurement system that is intended for the estimation of the dispersive dielectric properties for densely packed pellets. In particular, we estimate the Debye parameters for the effective permittivity of a mixture of air and densely packed moist microcrystalline cellulose pellets for the frequency band 2.7–5.1 GHz. The Debye parameters are estimated by means of minimizing the misfit between the measured scattering parameters and the corresponding computed response given a model of the measurement system. This minimization is performed by means of a nonlinear iterative optimization procedure, which is supported by continuum sensitivities, and the optimum is found in 10–60 iterations for the cases presented in this article. We find that increasing moisture content yields an increase in the static permittivity and a decrease in the relaxation time.

Nyckelord: Dispersive media; Finite element method; Gradient-based optimization; Microcrystalline cellulose; Microwave measurement; Permittivity; Sensitivities

Denna post skapades 2017-06-09. Senast ändrad 2017-07-20.
CPL Pubid: 249664


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Institutioner (Chalmers)

Institutionen för signaler och system, Signalbehandling (1900-2017)



Chalmers infrastruktur