Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1994-03-14
1996-02-06
Wieder, Kenneth A.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324449, 204406, 205 81, G01N 2702
Patent
active
054898498
ABSTRACT:
An apparatus and method for measuring electrical parameters of a medium such as electrical conductivity and dielectric constant between a pair of electrodes are disclosed. The medium can be a liquid, gas, powder, etc., and the electrodes can be coaxial metallic circular cylinders. To compute electrical conductivity, the device is immersed in the medium to an immersion depth and the conductance across the electrodes is determined. The measurement is repeated at at least one additional immersion depth. By obtaining a differential conductance measurement with respect to the immersion depth, the effects of fringe conductances are eliminated from the measurement. The device can also be used to determine dielectric constant of the material by obtaining a differential capacitance measurement with respect to immersion depth. The device need not be calibrated by performing resistance measurements in a known standard solution. Also, because the electrodes can be purely metallic and include no dielectric material, the device can be used to perform measurements in highly corrosive media whose compositions would be altered upon contact with dielectric materials.
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Fried Naomi A.
Rhoads Kevin G.
Sadoway Donald R.
Schiefelbein Susan L.
Massachusetts Institute of Technology
Tobin Christopher M.
Wieder Kenneth A.
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