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Methods and devices for erasing errors and compensating interference signals caused by gammagraphy in radiometric measuring systems

A radiation measurement and interference signal technology, which is applied in the direction of using radiation for material analysis, mechanical equipment, measuring devices, etc., can solve the problems that process variables cannot be measured and monitored, and pipelines and container walls are not checked.

Inactive Publication Date: 2005-04-13
EHNDRESS KHAUZER GMBKH KO KG
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Problems solved by technology

The disadvantages of this approach are obvious: either the process variable recorded by the radiometric system can no longer be measured and monitored, with potentially serious consequences in process control; or the gamma radiography measurement must be abandoned, so that when there is no Interruption of recording can be allowed without inspection of pipes and vessel walls and welds, which exists in particular in the case of radiometric measurements of the level of the medium in the vessel, where the pump is controlled based on the current level measurement
Alternatively, the affected branch during shutdown is equally problematic for most plant operators

Method used

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  • Methods and devices for erasing errors and compensating interference signals caused by gammagraphy in radiometric measuring systems
  • Methods and devices for erasing errors and compensating interference signals caused by gammagraphy in radiometric measuring systems
  • Methods and devices for erasing errors and compensating interference signals caused by gammagraphy in radiometric measuring systems

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Embodiment Construction

[0046] figure 1 An example of a part of an existing industrial plant for a so-called process is shown. A radiation measuring system 14 is placed at the container 10 in which the medium 12 is accommodated. System 14 includes radiator 16 and detector 18 . like figure 1 As shown, the radioactive radiator 16 and detector 18 are placed on opposite sides of the container 10 as is common for such installations. The area covered by the radiation emitted by the radioactive radiator 16 and reaching the detector 18 is indicated by dashed lines, but will not be described in detail here. The radiometric system 14 also includes evaluation electronics 20, in which the detector 18 at any time t i Measured value Lm (t) Formed for the recorded process variable L (t) signal of. Here and the process variable L discussed below (t) Preferably it is the fill level of the medium 12 in the container 10 . In principle, however, it could be any other process variable that can be obtained by a r...

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Abstract

The invention relates to a method and a device for error elimination and compensation of gamma radiography-induced interference signals in radiometric systems according to process measurement technology. The device of the invention comprises: an input for the measured value Lm (t) of the process variable L (t) measured by the detector, for at least one non-radiometrically measured and also monitored first process parameter P1=P1(t -τ), where its change leads to a change in the radiation measurement Lm(t) ΔLm=Lm(tj)-Lm(tj+1), with a possible delay time τk, which can also be τk=0; connected to the output of the process control system, and to the detection and error compensation device which, during operation, determines the ratio of the radiation measurements Lm (ti) and Lm (ti+1) detected by the detector at two successive random instants ti and ti+1 Change ΔLm=Lm(ti)−Lm(ti+1), and using the mathematical correlation ΔLm=f(ΔP1) with the change ΔP1=P1( ti-τ)-P1(ti+1-τ) for comparison.

Description

technical field [0001] The invention relates to a method and a device for error cancellation and error compensation of gamma radiography-induced interference signals in radiometric systems. Background technique [0002] Radiation measuring systems have been used for many years as a contactless measuring method for process measurement. They are used when process parameters such as the level of the medium in a container, the interface and / or the density of the medium have to be measured under difficult conditions such as extreme temperatures and pressures. Known radiation measurement systems generally comprise radioactive radiators and detectors installed in containers or pipes, as well as evaluation units. The related measurement methods are also similar. Especially in the chemical industry, radiometric measurements are indispensable for difficult processes. [0003] On the other hand, especially in chemical plants, the integrity of pipes and vessels as well as their conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/288G01N9/24
CPCG01F23/288G01N9/24
Inventor 亚历山德鲁·尼斯托尔
Owner EHNDRESS KHAUZER GMBKH KO KG
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