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A tdr method for measuring conductivity based on frequency stepping principle

A technology of frequency stepping and conductivity, applied in the direction of material impedance, etc., can solve the problems of inflexible point of reflection signal, difficulty in waveform analysis, fast signal attenuation, etc.

Active Publication Date: 2021-07-06
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the conductivity is high, the signal decays faster, and the inflection point of the reflected signal is not obvious, which brings great difficulties to waveform analysis

Method used

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  • A tdr method for measuring conductivity based on frequency stepping principle
  • A tdr method for measuring conductivity based on frequency stepping principle
  • A tdr method for measuring conductivity based on frequency stepping principle

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be further described below.

[0027] Neither the endpoints nor any values ​​of the ranges disclosed herein are limited to such precise ranges or values, and these ranges or values ​​are understood to include values ​​approaching these ranges or values. For numerical ranges, between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values ​​can be combined with each other to obtain one or more new numerical ranges, these values Ranges should be considered as specifically disclosed herein.

[0028] The present invention provides please refer to Figure 1-8 , the present invention pr...

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Abstract

The present invention provides a method for TDR testing conductivity based on the principle of frequency stepping, comprising the following steps: transmitting a measurement signal, and recording the time point at which the reflection signal at the starting end of the probe is received t 1 and the time point when the reflected signal from the end of the probe is received t 2 ,use t 1 and t 2 Calculate the dielectric constant of the medium K a ; If the medium is liquid, calibrate the probe and obtain the calibration coefficients P and k of the probe 1 , to obtain the peak value m of the reflected signal at both ends of the impedance converter segment 1 and m 2 , to obtain the peak reflection signal m at the tip of the probe 3 , calculate the conductivity of the medium; if the medium is soil, calibrate the probe, and obtain the calibration coefficients λ and k of the probe 2 And the calibration coefficient P in step S4, obtain the reflection signal peak value at both ends of the impedance converter, obtain the reflection signal peak value at the probe end, and calculate the conductivity of the medium. The method for testing electrical conductivity provided by the invention can utilize a TDR testing system to test electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of conductivity testing methods, in particular to a TDR testing conductivity method based on a frequency stepping principle. Background technique [0002] Conductivity is used to characterize the kinetic energy of charges in an applied electric field. Soil is composed of soil particles, water and air, so soil particle conductivity, pore water conductivity, soil porosity and saturation determine the conductivity of the soil. Among them, water content, porosity, pore water conductivity and temperature play a major role. Due to many factors, there is currently no soil conductivity model that can take these factors into account simultaneously. Archie (1942) used pore water conductivity, porosity and saturation in Archie's law to illustrate the calculation method of soil conductivity. Rhoades and Schilfgaarde (1976) proposed a formula that can take into account the conductivity of the soil surface and the cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02
CPCG01N27/02
Inventor 陈仁朋王鸿波康馨陈卓杨微
Owner HUNAN UNIV
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