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Guide wave radar level meter-based liquid dielectric constant assessing method

A technology of radar liquid level gauge and guided wave radar, which is applied in the direction of radio wave measurement system, material analysis using radiation diffraction, instruments, etc., can solve the problem that the dielectric constant cannot be measured and evaluated, and achieve high-precision level measurement The effect of the result

Active Publication Date: 2019-03-19
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for evaluating the dielectric constant of a liquid based on a guided wave radar level gauge, which solves the problem that the dielectric constant cannot be measured and evaluated

Method used

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  • Guide wave radar level meter-based liquid dielectric constant assessing method
  • Guide wave radar level meter-based liquid dielectric constant assessing method
  • Guide wave radar level meter-based liquid dielectric constant assessing method

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Experimental program
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Embodiment

[0080] Rod length is D B =1180mm, the coordinate position T measured from the tip of the probe to the liquid surface R =1.673ns, convert to distance to get D R =251mm, the coordinate position T from the tip of the probe to the liquid surface of the separation layer B =13.466ns, calculate the medium relative permittivity according to the present invention to obtain ε M = 3.625.

[0081] Such as figure 2 Shown is a schematic diagram of the application environment of the present invention.

[0082] The application environment is that the electromagnetic wave passes through the air through the probe to reach the liquid, and the container is filled with a liquid medium with a relative permittivity of εM and a relative permeability of μM, ε A and μ A Respectively represent the relative permittivity and relative permeability of the upper covering air, D R Indicates the distance from the tip of the probe to the liquid surface, D B Indicates the length information of the probe...

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Abstract

The invention relates to a guide wave radar level meter-based liquid dielectric constant assessing method. The guide wave radar level meter-based liquid dielectric constant assessing method comprisessampling the echo signals of a guide wave radar level meter according to a set sampling frequency to obtain original echo signals; searching for a plurality of effective peak messages and effective trough messages; performing feature extraction on a plurality of effective peak echo signals to obtain a maximum peak feature value to convert the distance from the top end of a guide wave rod to a liquid level; performing feature extraction on a plurality of effective trough echo signals to obtain a maximum trough feature value, performing sequencing to determine whether effective bottom echo exists, selecting the minimum coordinate position of a wave trough as the bottom information of the guide wave rod, and computing the transmission distance of the guide wave rod inside liquid as well as the dielectric constant of the liquid to be measured. The guide wave radar level meter-based liquid dielectric constant assessing method achieves assessment of the dielectric constant of the liquid to be detected according to the relationship between the bottom echo signals and the practical length of the wave guide rod, and can help correct dielectric constant parameters and further ensure high-precision material-level measurement.

Description

technical field [0001] The invention relates to the field of industrial level measurement, in particular to a method for evaluating the dielectric constant of a liquid based on a guided wave radar level gauge. Background technique [0002] The guided wave radar level gauge is an intelligent detection instrument that transmits electromagnetic waves through the guide rod. When encountering the liquid to be measured, part of the electromagnetic wave energy is reflected back, and the reflected echo is reflected on the signal to measure the filling height of the liquid. . [0003] The intensity of the reflected echo signal has a great relationship with the dielectric constant. When the dielectric constant is large (such as the dielectric constant of water is about 81), most of the electromagnetic wave signal is reflected back, forming a liquid level echo with a strong amplitude. Signal; when the dielectric constant is small (such as the dielectric constant of petroleum is about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20G01S7/292G01S7/35G01S7/41
CPCG01N23/20G01S7/2927G01S7/354G01S7/411
Inventor 杜劲松赵越南高洁王伟张清石
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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