Method and device for contactless level and interface detection
2006 (English)Patent (Other (popular science, discussion, etc.))
Method and apparatus for determining the thickness of material layers of a container-held substance comprising a first material disposed in an upper layer and a second material disposed in a lower layer, by transmitting a radio signal through the substance towards a container portion; receiving reflected signals from a surface of the upper layer, a surface of the second layer, and the container portion; varying the frequency of the transmitted signal to determine phase displacement between transmitted and reflected signals; determining optical distances to the surfaces and the container portion, dependent on the phase displacements; determining the thickness of one of said layers dependent on phase displacement through and index of refraction of that layer; and determining the thickness of the other layer dependent on the thickness of said one of said layers.
Place, publisher, year, edition, pages
Engineering and Technology
IdentifiersURN: urn:nbn:se:hh:diva-22992OAI: oai:DiVA.org:hh-22992DiVA: diva2:631034
US 8,044,843 B2 (2011-10-25)