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A novel mass flow detector has been developed using an open cylindrical resonator based on two microstrip patch couplers. The directivity of the couplers provides a compact sensor design without loss of sensitivity. The design of a particulate mass flow detector and the algorithm to detect the average solids concentration is shown. Spatial filtering velocimetry is applied to a microstrip patch sensor in order to detect the average particulate velocity. The simultaneous detection of the velocity and the solids/air concentration from a single measurement, ensure a true mass flow detector. Subsequently, free fall measurements as well as measurements in a self contained material flow measuring system were carried out in order to prove the concept.The novel detector offers good prospects for industrial applications with various scenarios of gas/solids, gas/liquid and liquid/ solids flows.Index Terms-Mass flow measurement, permittivity measurement, pneumatic conveying, spatial filtering velocimetry, transducers.

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