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Global monitoring of fluidized-bed processes by means of microwave cavity resonances

Johan Nohlert (Institutionen för signaler och system, Signalbehandling) ; 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) ; A. Holmgren ; Lubomir Gradinarsky ; Staffan Folestad ; Mats Viberg (Institutionen för signaler och system, Signalbehandling) ; Anders Rasmuson (Institutionen för kemi- och bioteknik, Kemisk apparatteknik)
Measurement: Journal of the International Measurement Confederation (0263-2241). Vol. 55 (2014), p. 520-535.
[Artikel, refereegranskad vetenskaplig]

We present an electromagnetic measurement system for monitoring of the effective permittivity in closed metal vessels, which are commonly used in the process industry. The measurement system exploits the process vessel as a microwave cavity resonator and the relative change in its complex resonance frequencies is related to the complex effective permittivity inside the vessel. Also, thermal expansion of the process vessel is taken into account and we compensate for its influence on the resonance frequencies by means of a priori information derived from a set of temperature measurements. The sensitivities, that relate the process state to the measured resonance frequencies, are computed by means of a detailed finite element model. The usefulness of the proposed measurement system is successfully demonstrated for a pharmaceutical fluidized-bed process, where the water and solid contents inside the process vessel is of interest.

Nyckelord: Electromagnetic homogenization , Finite element method , Microwave measurement system , Permittivity estimation , Pharmaceutical fluidized-bed process , Sensitivity analysis

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Denna post skapades 2014-08-19. Senast ändrad 2015-12-17.
CPL Pubid: 201625


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