Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Particle counting
Patent
1997-12-01
2000-03-28
Ballato, Josie
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Particle counting
324464, G01N 1502, G01N 2704
Patent
active
060436395
ABSTRACT:
There is provided a detector for detecting conductive contaminants entrained in an airflow. The detector comprises first and second electrically conductive meshes mounted in a spaced apart relationship to provide an operational gap. Each of the meshes is sized to provide a relatively large surface for substantially intersecting the airflow and is sufficiently porous so as not to substantially attenuate the airflow. The meshes form part of an energizable electric circuit wherein the operational gap constitutes a discontinuity of the circuit. The detector includes a capacitor connected in parallel to the portion of the circuit containing the operational gap for releasing a charge stored in the capacitor through the circuit discontinuity when one of the conductive contaminants simultaneously contacts the first and second meshes. The detector further provides for indication of a discharge of the capacitor and thereby the presence of one of the airborne conductive contaminants entrained in the airflow.
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Arrowsmith Peter
Duff John D.
Ballato Josie
Celestica International Inc.
Porat Alex
Solis Jose M.
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