SIGMA
(Symmetric Inclined Grid Mobility Analyzer)

Recent changes (January 2013):

An improved control program SIGMA1A2 was introduced August 2012, see Updates for SIGMA No.1, version 20120831. Corresponding comment is included also into the explanation of the standard output data.

January 2011 some minor improvements were included into programs SIGMA1P amd SIGMA1D. SIGMA1P now enables to avoid automatic filling of single gaps in data series and a special regime allows to change output variable 61. Corresponding changes are made in the new versions of the manuals. Additionally, a package of software is available for download.

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February, 2011

Dear Colleague,

This website presents introductory information about the
Symmetric Inclined Grid Mobility Analyzer SIGMA,
which is a successor of scanning mobility analyzers
IGMA (Inclined Grid Mobility Analyzer, Tammet, 2003) and
BSMA (Balanced Scanning Mobility Analyzer, Tammet, 2006).
SIGMA is designed having in view applications in
atmospheric aerosol research in the size range of
0.4-7.5 nm and the mobility range of 0.032-3.2 cm²V^-1s^-1.

A journal paper about SIGMA:
Tammet, H. (2011) Symmetric inclined grid mobility analyzer
for the measurement of charged clusters and fine nanoparticles
in atmospheric air. Aerosol Sci. Technol., 45, 468-479.
is available in web:
http://dx.doi.org/10.1080/02786826.2010.546818.

Following documents are published in the present web site:

• Introduction to SIGMA for readers who are familiar with BSMA
• Manual of SIGMA No.1 version 20111222
• Manual of SIGMA No.2 version 20111222
• Presentation for 13th air ion and aerosol workshop, Lund
• Presentation for IAC2010, Helsinki
• Control program SIGMA1A, version 20110214
• Updates for SIGMA No.1, version 20120831
• SIGMA No.2 technical drawings, photo, and information (Estonian)

Additionally, a MatLab program for drawing the surface plots
is available as a courtesy by Kaupo Komsaare