| 摘要 |
An apparatus for ascertaining and/or monitoring fill level and/or flow of a medium in a containment, including: at least one antenna, which radiates and/or receives high frequency signals according to a predetermined radiation characteristic along a main radiating axis in the direction of the surface 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 located between the antenna and the medium and having a first focal length in the direction of the antenna and a second focal length in the direction of the medium. A first focal point of the first focal length of the lens is so selected that the emitted high frequency signals of the antenna hit the lens within the lens aperture and that a second focal point of the second focal length lies in an opening region of the containment having an opening diameter that is smaller than the diameter of the lens aperture.
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