| 摘要 |
The consistency of a pulp slurry in a pipe (12) is determined using a pair of effective sound speeds a1effand a2effof the fluid/pipe system. The pair of effective system sound speed measurements is taken at two sensing regions X1, X2 along the pipe wherein each of the sensing regions comprises a different system cross sectional area compliance. The pair of effective system sound speeds a1eff and a2eff 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 a1eff and a2eff may be provided by a pair of sound speed meters positioned at sensing regions X1, X2 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). |
