Abstract
The consistency of a pulp slurry in a pipe 12 is determined using a pair of effective sound speeds a 1eff and a 2eff of the fluid/pipe system. The pair of effective system sound speed measurements are taken at two sensing regions X 1 , X 2 along the pipe wherein each of the sensing regions comprises a different system cross sectional area compliance. The pair of effective system sound speeds a 1eff and a 2eff are provided to signal processing logic 160 , which determines at least the composition of the fluid 12 flowing in the pipe 112 . The effective system sound speeds a 1eff and a 2eff may be provided by a pair of sound speed meters positioned at sensing regions X 1 , X 2 wherein the sound speed meters utilize a spatial array of acoustic pressure sensors placed at predetermined axial locations along the pipe 112 . One technique uses acoustic spatial array signal processing techniques with the direction of propagation of the acoustic signals along the longitudinal axis of the pipe 112.
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