G - Physics – 01 – N
Patent
G - Physics
01
N
324/47
G01N 15/06 (2006.01) G01N 27/70 (2006.01)
Patent
CA 1149873
ABSTRACT Apparatus for detecting the presence of more than a negligible concentration of dust or other particles in a moving stream of air or other gas, comprising first and second electri- cally conductive members spaced apart in a first region of the stream, means for providing thereto electrical potentials suf- ficiently different to provide a potential gradient of at least about 30.kilovolts per centimeter in a limited region adjacent to the surface of one of the conductive members to provide a corona and thus to produce ions that charge a substantial pro- portion of any particles in the gas passing through the first region; and passive means in a second region of the stream that is downstream from the first region, for-detecting the presence of a detectable concentration of charged particles in the gas while present in the second region. The passive means typically com- prises third and fourth electrically conductive members spaced apart in the second region, means for providing thereto electrical potentials of such difference as to provide a potential gradient of substantially less than about 30 kilovolts per centimeter therebetween, and means for detecting any measurable current flowing to the third member or the fourth member.
361120
Albrechtson Loren R.
Reif Robert B.
Battelle Development Corporation
Fetherstonhaugh & Co.
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