G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/02 (2006.01) B01D 46/46 (2006.01) F01N 3/021 (2006.01) F01N 9/00 (2006.01) F01N 11/00 (2006.01) G01N 22/00 (2006.01) F01N 13/02 (2010.01) F01N 7/02 (2006.01)
Patent
CA 2117078
2117078 9305388 PCTABS00020 In an apparatus for detecting the accumulation of particulate material on a filter medium formed of dielectric material and disposed in a chamber, the apparatus being operable for generating and transmitting an RF signal through the filter medium and for monitoring the transmission loss of the signal through at least a portion the filter medium so as to provide an indication of the content of particulate material accumulated on the filter medium, the improvement comprises an input antenna for transmitting the signal and having at least one antenna element extending longitudinally of the chamber and disposed within the filter medium; and an output antenna for receiving the signal transmitted by the input antenna and having at least one antenna element extending longitudinally of the chamber and disposed within the medium in parallel, spaced apart, axially overlapping relation with respect to the input antenna element.
Engine Control Systems Ltd.
Gowling Lafleur Henderson Llp
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