Method and device for determining the level of a filling in a container

US6930632B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Robert Lalla · Bad Kötzting, DE
• Bernhard Michalski · Maulburg, DE
• Herbert Schroth · Schopfheim, DE

Key dates

• Filing date: Feb 14, 2001
• Grant date: Aug 16, 2005
• Expiry date: Feb 14, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/88
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a method and a device for determining the level of a filling (1) in a container (2). The aim of the invention is to provide a method and a device for measuring said level which are economical to carry out/produce and which offer an especially high degree of measuring accuracy. To this end, the inventive method provides that transmit signals are sent in the form of a first binary-weighted pulse sequence of transmit pulses with a predetermined pulse repetition duration (τR) and a predetermined pulse sequence length (L) in the direction of the surface (3) of the filling (1); and the echo signals of the transmit pulses reflected on the surface (3) of the filling (1) are sampled with a second, preferably continuous sequence of sampling pulses of the pulse repetition duration τR, the second pulse sequence being delayed (τS) in relation to the first pulse sequence and the components of the sampling values that correspond to the echo signals with a propagation time of τ=τS being retained while components that correspond to echo signals with a propagation time of τS<τ<τS+L·τR are deleted. The level of the filling (1) in the container (2) is determined using the weig…