Global monitoring of fluidized-bed processes by means of microwave cavity resonances
Artikel i vetenskaplig tidskrift, 2014

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.

Permittivity estimation

Electromagnetic homogenization

Sensitivity analysis

Pharmaceutical fluidized-bed process

Finite element method

Microwave measurement system

Författare

Johan Nohlert

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Livia Cerullo

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

JOHAN WINGES

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Thomas Rylander

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Tomas McKelvey

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

A. Holmgren

AstraZeneca AB

Lubomir Gradinarsky

AstraZeneca AB

Staffan Folestad

AstraZeneca AB

Mats Viberg

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Signalbehandling

Anders Rasmuson

Chalmers, Kemi- och bioteknik, Kemisk apparatteknik

Measurement: Journal of the International Measurement Confederation

0263-2241 (ISSN)

Vol. 55 520-535

Styrkeområden

Produktion

Livsvetenskaper och teknik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Signalbehandling

DOI

10.1016/j.measurement.2014.05.034