Preconcentrator and Detector Apparatus
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United States of America Patent
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Issued Date -
Apr 9, 2009
app pub date -
Mar 27, 2007
filing date -
Mar 30, 2006
priority date (Note) -
Abandoned
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Abstract
IMS apparatus has a preconcentrator (20) connected at the inlet (2) of an IMS detector (1) such that all gas supplied to the detector flows through the preconcentrator. The preconcentrator comprises a metal tube (21) having a layer of silicone rubber (24) exposed on its inner surface (25). An electrical resistance heating element (22) extends under the silicone rubber layer (24) and is connected to a power source (23) such that the silicone rubber layer can be periodically heated to desorb substances absorbed by the layer and release them to flow to the IMS detector 1 at a higher concentration. The silicone rubber (24) can operate in the desorption phase in the presence of air without degradation.
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