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MOUDI stands for Microorifice Uniform Deposit Impactor. It is a type of cascade impactor that researchers use to study atmospheric pollution, visibility, and other research on airborne particles. MOUDIs differ from other cascade impactors in a number of ways and they are able to collect smaller particles. They work by collecting particles on substrates at eight stages, based on particle size.
TSI also offers a smaller-volume MOUDI, the Mini-MOUDI™ Impactor. The Mini-MOUDI is designed for flow rates at two liters per minute or less. On average, the puff volume demonstrated by smokers is between 20 and 70 milliliters. The Mini-MOUDI is also capable of separating smoke aerosol by particle size, making it uniquely suited for capturing and analyzing cigarette and electronic cigarette particles.
The TSI application note, Mini-MOUDI Impactor for Cigarette and E-Cigarette Research, shows the results of one aerosol mass study of both cigarettes and e-cigarettes.