Method and apparatus for measuring conductivity of powder materials using eddy currents
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United States of America Patent
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Oct 30, 2007
Grant Date -
Jun 15, 2006
app pub date -
Oct 6, 2005
filing date -
Oct 6, 2004
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Abstract
A method and related apparatus for non-contact measurement of electrical conductivity of powder-like materials using eddy currents includes the steps of placing a powder to be measured in a hollow dielectric sampling container, the sampling container disposed and freely axially moving within an outer dielectric housing. An eddy-current sensor including a winding is arranged on an outside surface of the housing. Current is forced in the winding to excite the powder to generate eddy currents. The introduced active resistance is measured at the eddy-current sensor and an electrical conductivity of the powder is determined using the measured active resistance. The powder is preferably vibration compacted and the density and electrical conductivity determined at a plurality of stages during the vibration compacting step.
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