Sound emission level detection

Details Sound emission level detection Sound emission level detection

G - Physics

01

F

349/38

G01F 23/28 (2006.01) G01F 23/296 (2006.01)

Patent

CA 1137617

ABSTRACT OF THE DISCLOSURE An assembly and method for determining the level of sound receivers are mounted at spaced verti- cal positions to the exterior of the vessel along a generally vertical line, and a sound generator is mounted atop the vessel approximately 180° around the circum- ferences of the vessel from the receivers. The sound waves are intermittently or cyclically generated by the sound generator, they are received by the receivers, and evaluated. For those receivers mounted below the level of the solids, the energy received will be low, while for those mounted above the solids level in the fluid phase of the vessel, the energy received will be high. For cellulosic chips, the receivers are tuned to respond primarily to sound at a frequency of about 3200 Hz. Alternatively, a number of sound generators are mounted at spaced vertical positions along the vessel, and a single receiver is mounted in operative association with the vessel fluid phase, the generators being selectively actuated for given time periods, and the receiver output being displayed relative to each generator actuation.

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