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Microwave On-Line Measurements on Conveyed Products Application to Paper and Wood Industries

Published online by Cambridge University Press:  15 February 2011

J.Ch. Bolomey ,
G. Cottard ,
P. Berthaud ,
A. Lemaitre  and
J. F. Portala
J.Ch. Bolomey
Affiliation:
Supélec, Plateau de Moulon, 91192 Gif-sur-Yvette, France
G. Cottard
Affiliation:
SATIMO, Le Pin, Rue de Terre de Feu, ZA de Courtabœuf, 91952 Les Ulis, France
P. Berthaud
Affiliation:
SATIMO, Le Pin, Rue de Terre de Feu, ZA de Courtabœuf, 91952 Les Ulis, France
A. Lemaitre
Affiliation:
CTP, Domaine Universitaire, BP 251, 38044 Grenoble Cedex 8, France
J. F. Portala
Affiliation:
CTBA, Rue de Blénot-Maidières, 54700 Pont-À-Mousson, France
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Abstract

Microwave multiport sensors have been shown to provide some unique capabilities to achieve real-time testing of products conveyed at high speed. In many applications, quantitative measurements of physical quantities such as moisture content, density, etc… are required, either to guarantee reliable production or to optimally control a fabrication/transformation process. In this paper, different ways of extracting such physical quantities from microwave measurements performed by multiport sensors are presented. Model approaches are used, based on polynomial expansions of the physical quantities to be measured as a function of the microwave amplitude and phase data. Calibration procedures have been investigated for both paper and wood material samples. Comparisons between in-situ, microwave and conventional, measurements are analysed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 161
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

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