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Phase spectrum method for time delay estimation using twin-plane electrical capacitance tomography

Phase spectrum method for time delay estimation using twin-plane electrical capacitance tomography

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Flow velocity distribution can be measured by means of a twin-plane tomography system and cross-correlation techniques. However, the use of these techniques based on finding the argument that maximises an estimated cross-correlation function (CCF) of corresponding pixels from two planes, in practice is limited by their low accuracy in reconstructed concentration. Presented is a method permitting the time delay to be measured with higher accuracy. The method is based on utilising the phase of the cross-spectral density of the CCF to estimate a time delay. The method is found to be more promising than the classical correlation method.

References

    1. 1)
      • R.A. Williams , M.S. Beck . (1995) Process tomography: principles, techniques and applications.
    2. 2)
      • M.S. Beck , A. Plaskowski . (1987) Cross correlation flowmeters–their design and application.
    3. 3)
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