PARTICLE-SIZE MEASUREMENT USING NONINVASIVE DIELECTRIC SENSORS

A new non-invasive technique incorporating the use of capacitance transducers has been developed which can be employed in measuring the size distribution of dilute sedimenting suspensions. This paper describes the measuring principle and compares two sets of particle size analyses, those of a sieved fraction and a polydisperse population of silica spheres, with those obtained by conventional sizing methods, based on the Andreasen sedimentation principle and on an electrical sensing zone technique using an Elzone instrument. Comparison of the capacitance technique is also made with the X-Ray Sedigraph method.