Pulsed admission of analyte to detection apparatus
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United States of America Patent
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May 30, 2017
Grant Date -
Sep 25, 2014
app pub date -
May 22, 2014
filing date -
Dec 20, 2006
priority date (Note) -
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Abstract
A detecting method using an IMS apparatus with a preconcentrator outside its inlet aperture. Analyte vapor is adsorbed during a first phase when substantially no gas is admitted to the reaction region. The preconcentrator is then energized to desorb the analyte molecules and create a volume of desorbed molecules outside the IMS housing. Next, a pressure pulser is energized momentarily to drop pressure in the housing and draw in a small sip of the analyte molecules from the desorbed volume through the aperture. This is repeated until the concentration of analyte molecules in the desorbed volume is too low for accurate analysis, following which the apparatus enters another adsorption phase.
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