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Soil body conductivity determination method based on active heating optical fiber process

A technology of active heating and measurement method, which is applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve problems such as low accuracy, instability, soil sample failure voltage, etc., and achieve the effect of accurate resistivity

Pending Publication Date: 2020-04-10
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a soil conductivity measurement method based on the active heating optical fiber method, which solves the problem that the measurement accuracy is not high due to the damage to the soil sample and the instability of the voltage in the current method of measuring conductivity. The problem

Method used

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  • Soil body conductivity determination method based on active heating optical fiber process
  • Soil body conductivity determination method based on active heating optical fiber process
  • Soil body conductivity determination method based on active heating optical fiber process

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Embodiment

[0058] A method for measuring the electrical conductivity of soil based on the active heating optical fiber method is carried out according to the following steps

[0059] One: Active heating method to measure moisture content

[0060] The active heating method is to heat the heating optical cable buried in the soil with electricity, and calculate the thermal resistance coefficient ρ of the soil according to the speed at which the linear heat source diffuses to the surrounding soil after the optical cable is heated, where the linear heat source and the surrounding soil The thermal resistance coefficient ρ satisfies the following formula (8):

[0061] T-T 0 =(q'ρ / 4π)ln(t+t 0 )+d formula (8)

[0062] Among them, T 0 is the initial temperature, T is the measured temperature value, t is the elapsed time, q' is the heating power of the heat source per unit length, ρ is the thermal resistance coefficient, t 0 is a time parameter related to the size of the heat source and the co...

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Abstract

The invention discloses a soil body conductivity determination method based on active heating optical fiber process. The method comprises the following steps of: 1, burying a heating type optical cable into a soil body for ohmic heating, measuring the thermal resistance coefficient rho of the soil body according to a linear heat source, then putting forward a temperature characteristic value Tt, and utilizing a linear function between the Tt and the volume moisture content theta of the soil, and finally acquiring an empirical model of Tt and theta; 2, establishing a capillary model, combiningthe capillary model with an empirical model to express the relationship between Tt and soil conductivity, establishing a theoretical model for solving the soil conductivity based on soil saturation according to the resistivity rho sat of saturated soil and the soil resistivity rho s, then converting the theoretical model into a relationship between theta and the soil conductivity, and performing combination with the empirical model to obtain a formula (1) of Tt and the soil conductivity to measure and calculate the soil conductivity. According to the invention, the measurement precision of conductivity is improved.

Description

technical field [0001] The invention belongs to the technical field of conductivity testing, and in particular relates to a soil conductivity measurement method based on an active heating optical fiber method. Background technique [0002] Electrical conductivity is an important electrical parameter of rock and soil, and is the basis of electric (magnetic) exploration in geophysics. In the power system, the soil resistance value is a parameter that is often used in lightning protection grounding projects. Its size directly affects the grounding resistance of the grounding device in the grounding project, the ground potential distribution of the ground grid, and the contact voltage and step resistance. Wait. Among them, the grounding resistance value is one of the important indicators to measure whether the grounding situation in the project meets the requirements of lightning protection safety regulations. When the system operates in the form of a single pole ground return ...

Claims

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Application Information

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IPC IPC(8): G01N27/04
CPCG01N27/041G01N27/048
Inventor 雒亿平
Owner XIAN UNIV OF TECH
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