Patent ID: 9400297
Filing Date: 2016-07-26
CPC Classification: B01D,F01N,G01N,G01R,Y02T

Claim Text:
1. A method for determining the contaminant material loading of a filter, wherein said contaminant material displaces a media in said filter, said filter contained within a metallic container forming a resonant cavity, wherein said media in said filter has a first dielectric constant and the contaminant material has a second dielectric constant different from said first dielectric constant, the method comprising: establishing microwave energy in the resonant cavity that generates multiple cavity resonant modes; monitoring changes in the cavity microwave response of at least two of said multiple cavity resonant modes; and determining a contaminant material loading of the filter based on the changes in the cavity microwave response of each of at least two of said multiple cavity resonant modes, wherein said determining the contaminant material loading of the filter comprises determining a spatial distribution of the contaminant material in the filter.