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

Author

Johan Nohlert

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Livia Cerullo

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

JOHAN WINGES

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Thomas Rylander

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Tomas McKelvey

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

A. Holmgren

AstraZeneca AB

Lubomir Gradinarsky

AstraZeneca AB

Staffan Folestad

AstraZeneca AB

Mats Viberg

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Anders Rasmuson

Chalmers, Chemical and Biological Engineering, Chemical Engineering Design

Measurement: Journal of the International Measurement Confederation

0263-2241 (ISSN)

Vol. 55 520-535

Areas of Advance

Production

Life Science Engineering (2010-2018)

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Subject Categories

Signal Processing

DOI

10.1016/j.measurement.2014.05.034

More information

Latest update

3/21/2018