AEROSOL RESEARCH GROUP

DEPARTMENT OF MECHANICAL AND MATERIALS ENGINEERING     •     2390 SOUTH YORK STREET     •     DENVER, CO 80208

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MACS  -  Multiple Aerosol Collection System


CNC   FCAS   FCAS III   N-MASS   MACS   LTI

Instrument Description:

1) Instrument Function. 

The Multiple Aerosol Collection System 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.


2) Utility of the Data.

Aerosol composition also shows strong gradients near the tropopause (Sheridan et al., 1994) and will be very informative concerning rocket emissions.  


3) Instrument Characteristics.

Response:  Control routines dictate the sampling duration and frequency.  Typically, sampling on an individual grid lasts 5 minutes (in the stratosphere).  Frequency of samples are typically time or pressure dependent for up to 24 samples.

Weight: Approximately 38 lbs.

Dimensions:    19" Rack mountable, 7" x 19" x 18"

References:

Sheridan, P. J., Brock, C. A., Wilson J. C., “Aerosol particles in the upper troposphere and lower stratosphere: Elemental composition and morphology of individual particles in northern midlatitudes” Geophysical Research Letters, 21, 2587-2590, 1994.

 

  Updated August 9, 2011

Contact: jwilson@du.edu