G - Physics – 01 – N
Patent
G - Physics
01
N
349/35
G01N 15/02 (2006.01) G01N 29/00 (2006.01)
Patent
CA 1152629
Abstract of the disclosure The average particle size for particles distributed in a slurry is determined by transmitting at least one beam of ultrasonic rays of a certain frequency into the slurry, detecting, by sepa- rate detector means, on one hand ultrasonic radiation that passes through the slurry and, on the other hand, ultrasonic radiation scattered in the slurry, said detector means forming first and second signals corresponding to the intensities of the passed-through and the scattered radiation respectively, de- termining the scattering attennation factor on the basis of said first and second signals and the total attennation factor by using the intensity of passed-through radiation obtained with pure water, and determining the particle size with the help of the scattering attennation factor, whereby the ratio of said factor and the total attennation factor is formed in order to eliminate influence of the slurry density. Two transmitters operating at different frequencies may be used, whereby one detector may detect passed-through radiation at one frequency and the other detector may detect scattered radiation at the other frequency.
351963
Andersson Tor S.
Kahara Lasse S.
Kiuru Erkki S.
Paukku Vaino A.
Uusitalo Seppo J.
Fetherstonhaugh & Co.
Outokumpu Oy
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