An apparatus for measuring the concentration of one material in another, such as the concentration of water in crude or refined mineral oil, comprises a conduit for receiving and discharging a continuous flow stream of the fluid mixture and which is formed as part of a coaxial microwave transmission...http://www.google.com/patents/US4862060?utm_source=gb-gplus-sharePatent US4862060 - Microwave apparatus for measuring fluid mixtures
