A method of determining the mass flow of a flow of grains

Details A method of determining the mass flow of a flow of grains A method of determining the mass flow of a flow of grains

G - Physics

01

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G01F 1/76 (2006.01) A01D 41/127 (2006.01) G01F 1/66 (2006.01) G01F 1/78 (2006.01) G01F 1/86 (2006.01) G01N 21/85 (2006.01) G01N 22/00 (2006.01)

Patent

CA 2223626

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.

Procédé permettant d'établir le débit-masse de matière en grains s'écoulant à travers un canal au moyen d'ondes électromagnétiques, de préférence, dans la zone hyperfréquence. Cette invention permet de mesurer soit l'affaiblissement soit le déphasage ou les deux et éventuellement la réflexion. Une fois que l'on connaît la réflexion et l'absorption, on peut déterminer le type de grains concernés, car le rapport de ces grandeurs constitue le trait distinctif de ces différents types. Lorsqu'on mesure, en particulier, des graines oléagineuses, qui sont susceptibles d'avoir un effet sur la permittivité relative, on a avantage à mesurer la phase du signal transmis étant donné que le déphasage est sensiblement proportionnel à l'écoulement de ces grains.

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