The design and performance of a real-time particle size measuring device for dense particulate systems are reported. Based on measuring the ratio of scattered light at two angles, this device, in contrast to particle sizing instruments previously reported, allows more than one particle in the focal volume at any time and selects the scattered light pulses for processing. Size distributions have been determined with an average number of particles in the focal volume of up to 2.5. This represents a potential increase of more than an order of magnitude in particle concentration over single particle sizing devices.
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