Particle velocity is an important parameter describing the flow state of gas-solids two-phase flow. A new spatial filtering method based on arc-shaped electrostatic sensor matrix was proposed for measuring local particle mean velocity of gas-solids two-phase flow.The sensing zone of each linear electrostatic sensor array was analyzed by using the finite element method.The relationship between the frequency spectrum characteristics of output signal of spatial filter matrix and particle velocity was obtained. A measurement system based on the arc-shaped electrostatic sensor matrix was developed. Performance of the measurement system was evaluated on a gravity-fed particles flow apparatus.The results of the particle velocity measurement indicated that each linear electrostatic sensor array of the matrix had its own sensing zone

and its output signal reflected the mean velocity of the particles in the zone.The system repeatability was within ±11%.Theoretical and experimental results demonstrated that the method was feasible.