Patent ID: 9170146
Filing Date: 2015-10-27
Classification: G01F,G01S

Abstract:
1. A method for measuring a fill level of a fill substance in a container with a fill-level measuring device working according to the travel time principle in measuring arrangements, in which, in the case of an empty container, at least a part of microwave signals transmitted into the container is reflected back to the fill-level measuring device via a reflection on a floor of the container, comprising the steps of: transmitting microwave signals from the fill-level measuring device into the container receiving as received signals portions of the microwave signals that are reflected in the container back to the fill-level measuring device after a travel time dependent on a path distance of the microwave signals traveled in the container; deriving echo functions based on the received signals, which show amplitudes of the received signals as a function of a position that corresponds to the travel time of the microwave signals or the path distance of the microwave signals traveled in the container; detecting whether the echo functions, contain a fill-level echo attributable to a reflection on a surface of the fill substance and whether the echo functions contain a container-floor echo attributable to a reflection on the container floor; and indicating the presence of an empty container only when no fill-level echo was detected in the respective echo function, and, a container-floor echo was detected at a container-floor echo position in the respective echo function, said container-floor echo lying in an earlier determined empty-echo-position range of the echo function, said empty-echo-position range being bounded on both ends, said container-floor.