US 11,946,789 B2
Fill level measuring device
Ghislain Daufeld, Village Neuf (FR); Stefan Gorenflo, Hausen (DE); Alexey Malinovskiy, Maulburg (DE); Jens Merle, Schopfheim (DE); and Markus Vogel, Schopfheim (DE)
Assigned to Endress+Hauser SE+Co. KG, Maulburg (DE)
Appl. No. 17/278,864
Filed by Endress+Hauser SE+Co. KG, Maulburg (DE)
PCT Filed Aug. 19, 2019, PCT No. PCT/EP2019/072118
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/064218, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 10 2018 123 429.5 (DE), filed on Sep. 24, 2018.
Prior Publication US 2022/0034701 A1, Feb. 3, 2022
Int. Cl. G01F 23/284 (2006.01)
CPC G01F 23/284 (2013.01) 7 Claims
OG exemplary drawing
 
1. A method for radar-based measurement of a fill level of a filling material located in a container, the method comprising:
emitting microwave pulses in a direction of the filling material at a defined clock rate;
receiving reflected microwave pulses after reflection of the emitted microwave pulses at a surface of the filling material;
generating an evaluation signal by sampling the received microwave pulses at a defined sampling rate;
measuring a relation between the clock rate and the sampling rate;
generating an evaluation curve by using the evaluation signal, the relation between the clock rate and the sampling rate, and a predefined target relation; and
determining the fill level by using the evaluation curve,
wherein the evaluation curve is generated by a temporal expansion or compression of the evaluation signal, wherein the compression or the expansion is carried out as a function of a ratio between the measured relation and the target relation.