초록 ▼

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 separate detector means, on one hand ultrasonic radiation that passes through the slurry and, on the other hand, ul

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 separate 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, determining the scattering attenuation factor on the basis of said first and second signals and the total attenuation factor by using the intensity of passed-through radiation obtained with pure water, and determining the particle size with the help of the scattering attenuation factor, whereby the radio of said factor and the total attenuation 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.

대표청구항 ▼

A method for the determination of the average particle size in a slurry, which comprises transmitting at least one beam of ultrasonic rays, having a certain frequency, into the slurry, detecting ultrasonic radiation which has passed through the slurry, creating a first signal corresponding to the in

A method for the determination of the average particle size in a slurry, which comprises transmitting at least one beam of ultrasonic rays, having a certain frequency, into the slurry, detecting ultrasonic radiation which has passed through the slurry, creating a first signal corresponding to the intensity Ia of the detected radiation, detecting in a selected direction ultrasonic radiation scattered in the slurry, creating a second signal corresponding to the intensity Is of the detected scattered radiation, determining the scattering attenuation factor on the basis of the first and second signals thus obtained, determining the total attenuation factor with the aid of the intensity Io of passed-through ultrasonic radiation obtained in pure water, and determining a measure descriptive of the average particle size with the aid of the scattering attenuation factor, whereby the ratio of the scattering attenuation factor and the total attenuation factor is formed in order to eliminate the influence of slurry density.