An apparatus and process are described for the characterization and/or identification of individual microparticles based upon the measurement of certain optical observables produced as each particle passes through a beam of light, or other electromagnetic radiation. A fine beam of, preferably, monochromatic...http://www.google.com/patents/US4548500?utm_source=gb-gplus-sharePatent US4548500 - Process and apparatus for identifying or characterizing small particles
