US 12,111,198 B2
Detection of event-based states during a fill level measurement
Jens Merle, Schopfheim (DE); Alexey Malinovskiy, Maulburg (DE); Stefan Gorenflo, Hausen (DE); and Markus Vogel, Schopfheim (DE)
Assigned to Endress+Hauser SE+Co. KG, Maulburg (DE)
Appl. No. 17/278,813
Filed by Endress+Hauser SE+Co. KG, Maulburg (DE)
PCT Filed Aug. 19, 2019, PCT No. PCT/EP2019/072075
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/064216, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 10 2018 123 432.5 (DE), filed on Sep. 24, 2018.
Prior Publication US 2022/0034700 A1, Feb. 3, 2022
Int. Cl. G01F 23/284 (2006.01)
CPC G01F 23/284 (2013.01) 3 Claims
OG exemplary drawing
 
1. A method for detecting a foaming of a filling material in a container with a radar-based fill-level measuring device that serves for measuring a fill level of the filling material in the container, the method comprising the following method steps which are repeated in successive measurement cycles:
emitting a microwave signal in a direction of the filling material;
receiving a receive signal after a reflection of the microwave signal inside the container;
generating an analysis curve on the basis of at least the receive signal, wherein the analysis curve is generated such that a signal strength of the receive signal is reproduced as a function of a measuring distance;
dividing a measurement region of the analysis curve into a near region, a middle region, and a far region;
detecting an area under the analysis curve within the far measurement region;
ascertaining a change and/or a dispersion of the detected area over proceeding measurement cycles; and
detecting the foaming when the change or the dispersion of the detected area exceeds or undershoots a specified threshold.