Fig. 3
From: Contamination-free non-contact wettability assessment system
Assessment of particle contamination risks. Two air-jet flows were investigated from: a an oil-free air compressor and b the air nozzle of the non-contact wettability assessment system. Graphs c, d show the numbers of particles with the diameters of 0.3, 0.5, and 1 μm in the two types of air-jet flows (N = 1). Photographs e show the results of micro-organism tests. The red arrow head indicates the colony of micro-organisms