“…The use of lasers was implemented in two instruments for particle size determinations as outlined by Harris et al (60), who used a 4-W argon ion laser in a new sensing zone counter, and Ricci and Cooper (148), who described the use of a low-power HeNc laser to monitor process slurries. In addition to these, Tanaka and Nakajima (182) and Cartan and Curtis (30) described new analyzers for rapid on-stream analysis. The use of small angle X-ray scattering to detect particles was the subject of papers by Brusset and Donati (27) and Mullaney and Dean (124).…”