1-2 Model 3936 Scanning Mobility Particle Sizer
TM
(SMPS
TM
) Spectrometer
The SMPS™ spectrometer can be used in applications like these:
Basic aerosol research
Nanometer-particle research
Atmospheric aerosol studies
Pollution studies
Smog chamber evaluations
Aerosol dynamics
Engine exhaust and combustion studies
Materials synthesis
Filter efficiency testing
Nucleation/condensation studies
Inhalation toxicology studies
Characterizing sprays, powders, and other generated aerosols
Detecting small changes in rapidly changing aerosol systems
Mobile aerosol studies
How the System Operates
The Model 3936 SMPS™ spectrometer measures the size
distribution of particles using an electrical mobility detection
technique. The SMPS spectrometer uses a bipolar charger in the
Electrostatic Classifier to charge the particles to a known charge
distribution. The particles are then classified according to their
ability to traverse an electrical field, and counted with a Model
3782, 3785, or 3786 Water-based Condensation Particle Counter
(WCPC), 3772, 3775, 3776, 3010, 3022A, or 3025A Condensation
Particle Counter (CPC).
The entire system is automated. Data analysis is performed using a
computer system with customized software. The Aerosol Instrument
Manager
®
Software for SMPS™ spectrometer collects and stores
sample data. Data can be displayed in graphs and tables and can
be exported to other applications.
For a detailed theory of operation, refer to Appendix B
.