Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1989-11-13
1992-06-16
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73602, 738655, G01N 1502
Patent
active
051216299
ABSTRACT:
The present invention relates to method and apparatus for determining the size distribution and concentration of particles in suspensions, emulsions or aerosols utilizing ultrasonic excitation. The invention is applicable over a wide range of particle sizes (0.01 to 1,000 microns) and concentrations (0.1% to 70% by volume). The present invention is particularly useful for industrial on-line measurement and control of highly concentrated slurries. The method comprises the steps of directing ultrasonic waves through the suspension at selected discrete frequencies over a selected frequency range and measuring the attenuation of the ultrasonic waves passing through the suspension for each of the selected discrete frequencies to thereby obtain a measured attenuation spectrum for the suspension over the selected frequency range. The method further comprises the steps of calculating a set of attenuation spectra for the ultrasonic waves passing through the suspension over the selected frequency range using a set of original values of particle size distribution and concentration and comparing the measured attenuation spectrum with the calculated attenuation spectra to derive an approximate match between at least one of the calculated spectra and the measured spectrum within a selected error range. The method further comprises the step of selecting the size distribution and concentration of the particles used to calculate the attenuation spectra to thereby derive a new set of values of particle size distribution and concentration corresponding to the measured attenuation spectrum.
REFERENCES:
patent: 3779070 (1973-12-01), Cushman et al.
patent: 4412451 (1983-11-01), Uusitalo et al.
patent: 4706509 (1987-11-01), Riebel
E. I. Du Pont de Nemours and Company
Finley Rose M.
Williams Hezron E.
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