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45123 
Journal Article 
A microorifice uniform deposit impactor (MOUDI): Description, calibration, and use 
Marple, VA; Rubow, KL; Behm, SM 
1991 
Yes 
Aerosol Science and Technology
ISSN: 0278-6826
EISSN: 1521-7388 
14 
4 
434-446 
An eight-stage cascade impactor, with cut-sizes ranging from 0.056 to 13 Ám at a flow rate of 30 L/min, has been developed, calibrated, and tested in field programs. This impactor, called a microorifice uniform deposit impactor, has several features not normally found in cascade impactors. Ultrafine particles as small as 0.056 Ám are collected while keeping the pressure drop moderate by utilizing multiple nozzles (up to 2000) as small as 52 Ám In diameter. At each stage the collected particles are deposited uniformly over the entire impaction plate by rotating the Impaction plate relative to the nozzles and by the correct radial placement of the nozzles. The particle cutoff characteristics (collection efficiency curves) of each stage and interstage losses were determined by means of monodisperse aerosols. The cutoff characteristics were found to be sharp and similar for all stages. 
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