Physics – Instrumentation and Detectors
Scientific paper
2009-02-07
Physics
Instrumentation and Detectors
corrected typos, grammar, 1 figure added
Scientific paper
Ion Mobility Spectrometry (IMS) is a well-known, sensitive and rapid technique to detect dangerous organic compounds. We propose a system in which a crown type discharge generates a ionic flow that is swept towards an array of collectors by a transverse electric field. The ions are separated as they enter the cell according to their mobility. Thus, the distribution of the charge deposited at the detector assembly constitutes a {\em fingerprint} for each organic compound. Simulations of our cell and experiments were performed for small amounts of acetone, ethanol and toluene. The dependence on the cell parameters of the current and charge versus time of flight was analyzed. Our simulation reproduces only qualitatively the experimental results. However, a PCA statistical analysis of the results obtained by simulation of the proposed design shows that the fingerprint is useful for a clear identification of such compounds.
Aucar Gustavo A.
Boggio Norberto G.
Boselli Alfredo
Gomez Sergio
Lamagna Alberto
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