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 language | English (US) |
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Pages (from-to) | 3-15 |
Number of pages | 13 |
Journal | TSI Journal of Particle Instrumentation |
Volume | 1 |
Issue number | 2 |
State | Published - Jul 1986 |
Externally published | Yes |