Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1986-04-01
1988-03-01
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 61P, 324 715, 204 1T, 204400, G01R 2726
Patent
active
047288825
ABSTRACT:
An apparatus for detecting the concentration of certain analytes, including hydrocarbons, in a liquid medium, is disclosed. The apparatus uses a planar or "open" capacitor containing an active layer. In response to selected analyte in the liquid medium, the active layer causes capacitance to decrease with increasing analyte concentration. The capacitance decreases because higher dielectric water molecules are displaced from a region of the capacitor's electric field. For certain hydrocarbon analytes having high Henry's Law constants, the active layer causes bubbles to nucleate in the liquid medium on the surface of the active layer. Bubble formation displaces water molecules and decreases capacitance.
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Newman Arnold L.
Stanbro William D.
Archibald Robert E.
Califano Howard W.
Eisenzopf Reinhard J.
Mueller Robert W.
The Johns Hopkins University
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