A non-rotating cascade impactor operates as does a traditional aerosol particle impactor. In the rotate version, the collection substrates rotate such that each collection substrate stage collects a uniform range of particles across each collection substrate. Non Rotate of the collection substrates directs the particle aerosol stream to one location on the substrate. Thus, a Non-Rotate Impactor is generally used for Mass measurements.
By spreading the particle deposit across a collection substrate, the particle mass can be reduced significantly per square millimeter of surface area. This allows more particle mass to be collected without over saturating to collection substrate, and generally allows a more uniform particle distribution across the substrate, which supports SEM or TEM particle analysis.