Aerosol sizing by means of laser-induced fluorescence

Abstract

A technique for accurately measuring in situ the size distribution of liquid aerosols is described. The method is based on the measurement of signal modulation when fluorescent particles cross the probe volume of a real fringe laser velocimeter. This provides an exact measurement of droplet diameter free from the errors associated with a similar scattered light technique.

Capacitive-type counter of nanoparticles in air

“…Recently Chow and Watson 2 reviewed measurement methods for size and composition of ultrafine particles, which are synonym for nanoparticles sized from 1 to 100 nm. There are only a few methods for direct detection of nanoparticles in air in their primary size: ͑a͒ light scattering, 3 ͑b͒ laser induced fluorescence, 4 and ͑c͒ measuring the time of flight. 5 More frequently nanoparticles are detected indirectly by causing a disturbance in a transition process or an unbalance in equilibrium with measurable consequences.…”