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TDR conductivity testing method based on frequency stepping principle

A frequency step, conductivity technology, applied in the direction of material impedance, etc., can solve the problems of inflection point of reflected signal, fast signal attenuation, difficulty in waveform analysis, etc.

Active Publication Date: 2021-05-28
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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  • TDR conductivity testing method based on frequency stepping principle
  • TDR conductivity testing method based on frequency stepping principle
  • TDR conductivity testing method 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 invention provides a TDR conductivity testing method based on a frequency stepping principle, which comprises the following steps of: transmitting a measurement signal, recording a time point t1 when a probe starting end reflection signal is received and a time point t2 when a probe tail end reflection signal is received, and calculating a dielectric constant Ka of a medium by utilizing t1 and t2; if the medium is liquid, calibrating the probe, obtaining calibration coefficients P and k1 of the probe, obtaining reflection signal peak values m1 and m2 at the two ends of the impedance converter section, obtaining a reflection signal peak value m3 at the tail end of the probe, and calculating to obtain the conductivity of the medium; and if the medium is soil, calibrating the probe, obtaining calibration coefficients [lambda] and k2 of the probe and the calibration coefficient P in the step S4, obtaining a reflection signal peak value at the two ends of the impedance converter, obtaining a reflection signal peak value at the tail end of the probe, and calculating to obtain the conductivity of the medium. According to the conductivity testing method provided by the invention, the conductivity can be tested by using the TDR testing system.

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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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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