Microwave sensing for determination of loading of filters
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United States of America Patent
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Mar 16, 2010
Grant Date -
Mar 6, 2008
app pub date -
Apr 30, 2007
filing date -
May 1, 2006
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Abstract
Method for determining loading of a filter. The filter has a first dielectric constant. The filter becomes loaded with contaminant material that has a second dielectric constant. The filter, such as a diesel particulate filter, is contained within a metallic enclosure forming a microwave cavity. The method includes establishing microwave energy in the cavity and monitoring changes in the cavity microwave response, the changes being related to filter loading.
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