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

1982-06-21

1984-10-16

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

044777710

ABSTRACT:
Conductive particulates 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 throughout 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 monitored 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.

REFERENCES:
patent: 4042879 (1977-08-01), Ho et al.
patent: 4369404 (1983-01-01), Flygare et al.

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