Method of determining the mass flow of a flow of grains
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United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Apr 13, 1998
filing date -
Jun 2, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of determining the mass flow speed of a granular material through a channel by means of electromagnetic waves, preferably in the microwave area. According to the invention, either the attenuation or the phase-shift is measured or both the attenuation and the phase-shift and optionally also the reflection. Based on the knowledge of both the reflection and the absorption it is possible to determine the type of grains being involved because the proportion of these magnitudes is characteristic of the various types. When measuring especially oil-containing grains which are able to have an effect on the dielectricity constant, it is advantageous to measure the phase of the transmitted signal because the phase-shift is substantially proportional to the flow of such grains.
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