Abstract
A novel method of measuring flow velocity is put forward, which need no equipment or hardware. Utilizing the Doppler-effect that pulp flow velocity (PFV) causes effect upon pulp consistency noise signal, we can determine PFV carrying out time-frequency analysis of the noise of pulp consistency signal on the basis of pulp consistency measurement. The detailed calculating steps are proposed, firstly, noise signal is separated from pulp consistency signal, then it is analyzed by means of the short time power spectrum (STPS) or wavelet transform (WT), finally the PFV can be obtained according to the scale change of STPS or the period change of WT. The corresponding tests show that the measurement method is feasible with high precision.
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