Microwave detection of soot content in a particulate trap

Details Microwave detection of soot content in a particulate trap Microwave detection of soot content in a particulate trap

G - Physics

01

N

73/69

G01N 22/00 (2006.01) F01N 9/00 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1188129

MICROWAVE DETECTION OF SOOT CONTENT IN A PARTICULATE TRAP Abstract of the Disclosure , Conductive particulate in the form of soot are collected from diesel engine exhaust gases on a porous wall monolithic ceramic filter in such a way that the soot is somewhat uniformly distributed through- out the filter. The filter is housed in a chamber having a property of a microwave resonant cavity and the cavity is excited with microwave energy. As the particulates are collected the cavity appears to the microwaves to have an increasing dielectric constant even though the matter being accumulated is conductive rather than dielectric so that as collected on the porous filter it has the property of an artificial dielectric. The response of the cavity to the microwave energy is moni- tored to sense the effect of the dielectric constant of the material within the cavity to provide a measure of the soot content in the filter.

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