Patent ID: 7861600
Filing Date: 2011-01-04
Classification: G01F,G01S,H01Q

Abstract:
1. An apparatus for ascertaining and/or monitoring fill level and/or flow of a medium in a containment, comprising: at least one antenna, which emits and/or receives high frequency signals with a predetermined radiation characteristic along a main radiation axis in the direction of the medium; a control/evaluation unit, which evaluates the reflected high frequency signals and determines fill level on the basis of the travel time of the high frequency signals and/or flow on the basis of a Doppler frequency of the reflected high frequency signals; and at least one lens provided between said at least one antenna and the medium and having a first focal length in the direction of said at least one antenna and a second focal length in the direction of the surface of the medium, wherein: a first focal point of said first focal length is so selected, that the emitted high frequency signals of said at least one antenna hits said at least one lens within a lens aperture; and a second focal point of said second focal length lies in an opening region of the containment having an opening diameter, which is smaller than the diameter of said lens aperture.