Solid Particle Velocity Measurement Using Electrostatic Induction Based Spatial Filtering Method
Shimin Wang · Proceedings of the CSEE · 2007
Electrostatic induction based spatial filtering technique for solid particle velocity measurement has the advantages of the simplicity of measurement system and the convenience of data processing. The relationship between the solid particle velocity and the power spectrum of output signal of the electrostatic senor was derived theoretically. And the effects of the length of the electrode, the thickness of the dielectric pipe and the length of the mental screen on the spatial filtering property of the sensor were investigated numerically using finite element method. Additionally, as for the roughness of the power spectrum characteristics curve of the output signal and the difficult determination of peak frequency fmax, a wavelet analysis based filtering method was adopted to smooth the curve, which can determine peak frequency fmax accurately. Finally, the velocity measurement method was applied to a dense phase pneumatic conveying system under high pressure, and the experimental results show that the system repeatability is within ±4% over the gas superficial velocity range of 8.63~18.61m/s for particle concentration range 6.72%~13.04%.