Ion mobility spectrometer which controls carrier gas flow to improve detection
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United States of America Patent
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Dec 6, 2016
Grant Date -
Mar 27, 2014
app pub date -
Nov 18, 2013
filing date -
Dec 20, 2006
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Abstract
IMS apparatus has an inlet with a preconcentrator opening into a reaction region where analyte molecules are ionized and passed via a shutter to a drift region for collection and analysis. A pump and filter arrangement supplies a flushing flow of clean gas to the housing in opposition to ion flow. A pressure pulser connects with the housing and is momentarily switched to cause a short drop in pressure, in the housing to draw in a bolus of analyte sample from the preconcentrator. Just prior to admitting a bolus of sample, the pump is turned off so that the flushing flow drops substantially to zero, thereby prolonging the time the analyte molecules spend in the reaction region.
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