| definition |
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Multiple Aerosol Collection System (MACS) contains an impactor
collector, which permits the collection of particles on electron
microscope grids for later chemical-constituent analysis. The
collector consists of a two stages. In the first stage the
pressure of the sample is reduced by a factor of two without
loosing particles by impaction on walls. The second stage
consists of a thin plate impactor which collects efficiently
even at small Reynolds numbers. The system collects particles
as small as 0.02 micron at WB-57F cruise altitudes. As many as
24 samples can be collected in a flight.
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