G PHYSICS
G01 MEASURING; TESTING
G01N INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N15/00 Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
G01N15/10 Investigating individual particles
G01N15/14 Optical investigation techniques, e.g. flow cytometry
G01N15/1434 Optical arrangements