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Intermittent surface measurement

An electromagnetic measurement and detection signal technology, applied in the field of material level gauge system, can solve the problems of unreliable, reliable measurement, unstable height reading, unreliable next measurement, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2013-04-03
ROSEMOUNT TANK RADAR
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] However, there are also problems associated with intermittent measurements
For example, the system may be configured to wake up and perform measurements at regular intervals, and if the surface properties of the product being measured change over time, the measurements may provide unreliable results
Also, the next measurement may also be unreliable, etc., leading to a long period between reliable measurements and unstable altitude readings

Method used

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Embodiment Construction

[0037] In this detailed description, various embodiments of the method and system according to the present invention are discussed primarily with reference to a radar level gauge system having a free-propagating antenna, such as a horn antenna, for determining the Product level. It should be noted that this in no way limits the scope of the invention, which is equally applicable to other signal propagation devices including other free-propagating antennas (such as rod antennas, panel antennas, fixed or movable parabolic antennas or cone antennas) and waveguides, such as still pipes, transmission lines or probes, such as single-wire probes (including so-called Goubau probes), double-wire probes or coaxial probes.

[0038] Figure 1a A transmitting and receiving antenna 1 in a level gauge system is schematically shown for transmitting an electromagnetic signal 2 to a surface 3 of a product. When the signal 2 reaches the surface 3 at least part of the signal is reflected 4 . ...

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Abstract

A method of determining a filling level of a product contained in a tank and a level indicator system are provided. The method comprises the steps of: a) transmitting an electromagnetic probing signal towards a target area of a surface of the product; b) receiving a reflected probing signal being a reflection of the electromagnetic probing signal at the surface; c) determining a parameter value indicative of an amplitude of the reflected probing signal; if the parameter value is indicative of an amplitude larger than a predetermined threshold value: d) transmitting an electromagnetic measuring signal towards the target area of the surface; e) receiving a return signal being a reflection of the electromagnetic measuring signal at the surface; and f) determining the filling level based on a time relation between the electromagnetic measuring signal and the return signal.

Description

technical field [0001] The present invention relates to a level gauge system that uses electromagnetic waves to determine the distance to the surface of a product contained in a tank. Background technique [0002] Field devices such as radar level gauges are suitable for measuring the level of products such as process fluids, granular materials, and other materials. An example of such a radar level gauge may include: a microwave unit for transmitting microwaves to a surface and receiving microwaves reflected by the surface; processing circuitry arranged to communicate with the microwave unit and to The height is determined by the relationship. [0003] In recent years, there has been an increasing demand for wireless measurement devices or systems with other constraints on power consumption, such as, for example, so-called loop-powered systems connected by a current loop of 4-20 mA. The wireless measurement device may be powered by batteries or solar energy, for example. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/284
CPCG01F23/284G01S7/2922G01S13/10G01S13/08
Inventor 法比安·文格尔
Owner ROSEMOUNT TANK RADAR
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