Method and apparatus for determining the percentage water content of oil in water emulsion by specific admittance measure. US Patent Number 5,260,667 (1993):
The idea is to measure how much water a oil in water emulsion have using electrical properties of the sample in an online situation.
Method and Measuring System for a Multiphase Fluid. Venezuelan Patent Office (Pending): Here, the idea is to measure oil , water and gas in on line situation with a previous separation between the liquid and the gas.