Parameter Selection in Cross-Correlation-Based Velocimetry Using Circular Electrostatic Sensors

Cross-correlation methods combined with electrostatic sensing technology offer a promising solution to the online continuous measurement of velocity of particulate solids in pneumatic pipelines. To obtain accurate velocity, the selections of sampling frequency and integral time are critical. The selection of sampling frequency is strongly influenced by the frequency characteristic of the signal. By using finite-element modeling (FEM), the frequency characteristic of the electrostatic sensor was analyzed. To illustrate the particle distribution and the velocity profiles' influence on the frequency characteristic of the electrostatic signal, an electrostatic velocimetry calibration apparatus was built. Based on the foregoing analysis and taking the measurement error of the transit time and the real application requirement into account, the principles of the selection of sampling frequency and integral time were described.

[1]  Yong Yan,et al.  Measurement of particulate velocity under stack-flow conditions , 2000 .

[2]  J.E. Amadi-Echendu,et al.  Solid phase velocity measurements utilising electrostatic sensors and cross correlation signal processing , 1995, Proceedings of 1995 IEEE Instrumentation and Measurement Technology Conference - IMTC '95.

[3]  Yong Yan,et al.  Finite-Element Modeling of Electrostatic Sensors for the Flow Measurement of Particles in Pneumatic Pipelines , 2009, IEEE Transactions on Instrumentation and Measurement.

[4]  Y Yant,et al.  Velocity measurement of pneumatically I conveyed solids using electrodynamic I sensors , 1995 .

[5]  S. Woodhead,et al.  Electrostatic modelling and measurement of airborne particles concentration , 1995, Proceedings of 1995 IEEE Instrumentation and Measurement Technology Conference - IMTC '95.

[6]  Jianyong Zhang,et al.  Theoretical and experimental studies of the spatial sensitivity of an electrostatic pulverised fuel meter , 2005 .

[7]  Yong Yan,et al.  REVIEW ARTICLE: Mass flow measurement of bulk solids in pneumatic pipelines , 1996 .

[8]  Maurice Beck,et al.  Correlation in instruments: cross correlation flowmeters , 1981 .

[9]  H. Saunders.  Literature Review : RANDOM DATA: ANALYSIS AND MEASUREMENT PROCEDURES J. S. Bendat and A.G. Piersol Wiley-Interscience, New York, N. Y. (1971) , 1974 .

[10]  Wuqiang Yang,et al.  An intelligent cross correlator for pipeline flow velocity measurement , 1997 .

[11]  Tao Zhang,et al.  Parameters selection in the cross-correlation based velocimetry using electrostatic sensors , 2009, 2009 IEEE Instrumentation and Measurement Technology Conference.