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A method for detection of powder materials in metallic hollow structures using microwaves

Lubomir Gradinarsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Olle Nyström (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Victor Belitsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; S. Folestad ; Vessen Vassilev (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling)
Measurement (0263-2241 ). Vol. 41 (2008), 6, p. 637-646.
[Artikel, refereegranskad vetenskaplig]

This paper presents a method for detection of the presence of small amounts of solids (powders, granules, etc.) inside metallic structures such as process vessels and containers. The method is based on propagation of microwave electromagnetic (EM) energy inside the structures and analysing the complex reflection coefficient Gamma represented by the scattering parameter S-11. 3D EM simulations were used to predict the behaviour of S for structures of rectangular, circular, and conical shapes, contaminated with materials with weak dielectric properties. The suggested method sensitivity and the effects of the material size and its distribution were assessed and results presented of comparisons of simulations and measurements. This paper demonstrates the ability to detect very low levels of contamination, e.g. of the order of 0.01-0.03 parts of a reference vessel's volume of one (e.g. length = 1 cm, width = 0.5 cm, and height = 2 cm) for materials with weak dielectric properties. This sensitivity is even better in terms of volume ratio (contamination/vessel's volume) for structures with bigger volumes and contaminants with stronger dielectric properties e.g. wet powders. The method is fully scalable for vessels with different sizes. Therefore industrial application of the method to physical processing of pharmaceutics, food, agriculture and others is envisioned. (C) 2007 Elsevier Ltd. All rights reserved.

Nyckelord: Engineering, Multidisciplinary; Instruments & Instrumentation



Denna post skapades 2009-01-26. Senast ändrad 2014-09-02.
CPL Pubid: 88936

 

Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling (2005-2010)

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur