Detection of event-based states during a fill level measurement

A radar-based fill-level measuring device for measuring a fill level of a filling material in a container, the fill-level measuring device comprising:

• a signal generating unit designed to respectively emit a microwave signal in a direction of the filling material in successive measurement cycles;
• a receiving unit designed to receive a receive signal after reflection of the microwave signal inside the container;
• and
• an evaluation unit designed:
• to generate, on the basis of at least the receive signal, per measurement cycle, an analysis curve representing a signal strength of the receive signal as a function of the measuring distance;
• to divide a measurement region of the analysis curve into a near region, a middle region, and a far region;
• to detect an area under the analysis curve within the far measurement region;
• to ascertain a change and/or a dispersion of the detected area over proceeding measurement cycles;
• to detect a foaming of the filling material when the change or dispersion of the detected area exceeds or undershoots a specified threshold;
• and
• to determine the fill level via the analysis curve at least when the change or dispersion does not exceed or undershoot the specified threshold.