TANDEM DIFFERENTIAL MOBILITY ANALYZER.

Daniel J. Rader, Peter H. McMurry

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

An analytic expression for the response of a TDMA system is presented and its validity discussed. A least-squares minimization technique is used with this analytic result to extract inter-DMA size changes from experimental data. A FORTRAN computer code that demonstrates the method is included as an appendix. Using this method and available instrumentation, diameter changes can be measured with a precision of about 0. 3%. For aerosols in the 0. 01-0. 2 mu m diameter range where the technique works best, this corresponds to a precision in measuring diameter of 0. 03-0. 6 nm, or the characteristic thickness of a molecular monolayer. Guidelines for laboratory implementation of the TDMA are suggested and specific examples discussed. A more accurate numerical solution is used to estimate the systematic error introduced by the approximate, analytic expression.

Original languageEnglish (US)
Pages (from-to)3-15
Number of pages13
JournalTSI Journal of Particle Instrumentation
Volume1
Issue number2
StatePublished - Jul 1 1986

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