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Radar level gauge system

A radar, high-level technology, applied in radio wave measurement systems, instruments, using re-radiation, etc., can solve problems such as different echoes, and achieve the effect of easy and accurate detection

Inactive Publication Date: 2007-12-12
ROSEMOUNT TANK RADAR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A third approach is to use a more complex antenna for generating several different antenna lobes (or slightly non-vertical lobes rotated about the plumb line), all of which ideally give identical surface echoes, but substantially different echoes from interfering structures that are generally asymmetrically located
However, these known methods are not proposed to propose solutions to the above problems

Method used

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Embodiment Construction

[0084] Figure 1 schematically represents a radar level system 1 in which the invention may be advantageously incorporated. Briefly, the system in Figure 1 comprises an electronic unit 3 for transmitting and receiving radar signals and processing the received signals in order to determine the level in the tank, arranged in the tank for transmitting radar waves into the tank and An antenna 4 for receiving radar waves, and a radar waveguide assembly 5 for guiding signals between the electronic unit 3 and the antenna 4 . The same antenna can preferably be used simultaneously as transmitter for emitting output radiation and as receiver for receiving reflected echo signals, but it is also possible to use separate antennas for these functions. Exemplary embodiments of the present invention use a radar antenna that provides a free radar beam, in which case disturbing echoes are particularly common, however, by using a waveguide structure for transmitting the emitted radar beam to and / ...

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Abstract

A method and a system for radar-based gauging of a filling level of a filling material is disclosed, wherein the tank has at least one interfering structure. The method comprises: transmitting at a first time moment a microwave signal towards the surface of the filling material; receiving microwave signals as reflected against the surface of the filling material and as reflected against said at least one interfering structure; calculating based on propagation times of the transmitted and reflected microwave signals at least two distances to reflective surfaces in the tank; and repeating at a second time moment the transmitting, the detecting and the calculating, wherein said first time moment is timely separated from said second time moment. Based on the several repeated measurements, the distance to the surface of the filling material is determiend as the calculated distance that exhibits the greatest change between said first and second time moments. Based on this time difference analysis, it is possible to discinguish moving surfaces very easy and acurate. The method is specifically advantageous in overfill or high level alarm systems.

Description

technical field [0001] The invention relates to a radar level system for determining the filling level of filling material in a tank, the radar level system comprising: a transmitter for transmitting a measurement signal to the surface of the filling material; for receiving an echo signal from the tank a receiver; and a processing circuit for determining a fill level of a tank based on the echo signal. More particularly, the invention relates to a radar level system to be used in a tank having at least one interface structure reflecting emitted measurement signals. Furthermore, the invention also relates to a corresponding method for determining the filling level of filling material in a tank. Background technique [0002] Radar leveling (RLG) for measuring the level of fill materials such as liquids or solids such as granules is an increasingly important method for leveling in tanks, containers and the like. The general radar leveling process can be divided into three ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/284G01S13/08G01F23/296G01S
CPCG01F23/284
Inventor 托马斯·温内博格奥洛夫·爱德沃森
Owner ROSEMOUNT TANK RADAR
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