| 摘要 |
The present invention relates to a mass flow meter (1) for measuring the mass flow of a material supply flow of fluent particles. The mass flow meter (1) comprises means (2) for receiving the material supply flow, material conducting means (4) for conducting the material supply flow from the receiving means (2) towards an outlet (6) for discarding the material, wherein the material conducting means (4) comprise at least one guiding unit (9) for conducting the material flow through the mass flow meter (1) along at least one flow direction (8), wherein the at least one guiding unit (9) comprises at least one measuring unit (20) with a measuring surface (15) comprising velocity measuring means (10) for determining a velocity with which the material flow is flowing over the measuring surface (15) from an upper part towards a lower part of the measuring surface (15) and force measuring means (5) for determining a force exerted by the material flow to the measuring surface (15) when flowing over the measuring surface (15). The velocity measuring means (10) comprise at least a first and a second sensor placed at a distance (17) from each other in flow direction (8) of the material, the first (11) and second sensor (12) each being provided for gathering data on electrostatic charge of the material flow, as a function of time. The mass flow meter (1) comprises a processor for converting the data on the electrostatic charge as a function of time to an output signal representing the velocity with which the material flow is flowing over the measuring surface (15).
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