Instrument : Tandem Differential Mobility Analyzer (TDMA)

Instrument Categories

Picture of the Tandem Differential Mobility Analyzer (TDMA)

General Overview

The Tandem Differential Mobility Analyzer (TDMA) measures aerosol dry-size distribution and size-resolved hygroscopic growth. In its standard operating mode, dry aerosols are separated into size bins by the first differential mobility analyzer and then exposed to 85% relative humidity. The resulting hygroscopic growth distributions are then scanned by the second differential mobility analyzer for each dry-size bin.

Output Datastreams

  • tdmahyg : Tandem Differential Mobility Analyzer: hygroscopic growth rates
  • tdmasize : Tandem Differential Mobility Analyzer: size-resolved concentrations

Primary Measurements

The following measurements are those considered scientifically relevant.


Southern Great Plains
SGPC1 Browse DataCentral Facility, Lamont, OK


Don Collins
Texas A&M University
(979) 862-4401