Sensing pulverized material mixture proportions by resonant cavity measurements

Author

Nelson, Stuart O. ; Kraszewski, Andrzej W.

Author_Institution

Agric. Res. Service, Russell Res. Center, Athens, GA, USA

Volume

47

Issue

5

fYear

1998

fDate

10/1/1998 12:00:00 AM

Firstpage

1201

Lastpage

1204

Abstract

Based on differences in the permittivity of coal and limestone rock, a resonant cavity measurement technique is presented for the rapid determination of the proportions of coal and limestone in powdered mixtures. The ratio of the resonant frequency shift and the change in the transmission factor when mixed coal and limestone samples are inserted into the cavity provides a means for estimating the percentage of coal in the mixture relatively independent of the bulk density of the mixture. The technique might be developed for rapid tests of dust in coal mines to determine whether the 65% noncombustible content requirement is being met for prevention of coal mine explosions

Keywords

cavity resonators; coal; dust; microwave measurement; mining; permittivity measurement; pulverised fuels; coal mine explosions; coal permittivity; limestone rock permittivity; noncombustible content requirement; pulverized material mixture proportions determination; rapid dust tests; resonant cavity measurements; resonant frequency shift; transmission factor; Dielectric constant; Dielectric loss measurement; Dielectric losses; Dielectric materials; Dielectric measurements; Equations; Measurement techniques; Permittivity measurement; Resonance; Resonant frequency;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.746583

Filename

746583