GAS SAMPLING DEVICE AND METHOD FOR COLLECTION AND IN-SITU SPECTROSCOPIC INTERROGATION OF VAPORS AND AEROSOLS
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United States of America Patent
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Issued Date -
Mar 4, 2010
app pub date -
Jul 24, 2009
filing date -
Jul 25, 2008
priority date (Note) -
Abandoned
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Abstract
A gas sampling device, analyte detection system, and methods for identifying a vapor or aerosol analyte suspended in a gas are described. The gas sampling device comprises a chamber having a gas inlet port, a substrate, one or more gas outlet ports near the substrate, and a pump. The gas outlet ports direct airflow to a reflecting substrate coated with a spectroscopically-transparent material. Analytes are deposited on the coated substrate through impaction, for massive aerosols, and diffusion through the viscous boundary layer, for vapor analytes. In one analyte detection system, a spectroscopic instrument is positioned behind a window opposite the substrate to interrogate the coated substrate surface as analytes are collected. An alternate detection system combines the gas sampling device with a detector in fluid communication with the gas outlet ports from the chamber, wherein the substrate is used as an analyte concentrator.
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