A method and device for measuring soil porosity using an electrostatic collection radon measuring instrument

Abstract

The invention provides a method and device for obtaining soil porosity by performing sampling measurement on surface soil by using an electrostatic collection emanometer. The method comprises the following steps: computing to obtain accurate soil porosity Eta by using a change rule of the radon concentration in a closed-loop gas circuit measurement device, considering the decay, the leakage and the back-diffusion effect of the radon when computing the soil porosity of the sampled soil; backstepping the concentration of the radon through the concentration of the P0-218 by utilizing the electrostatic collection emanometer, and quickly computing by applying a nonlinear fitting algorithm so as to obtain the accurate soil porosity. The measurement time is saved since the stabilization of the radon concentration in the measurement device is unnecessary. The sampling measurement process and the computation method are simple, various elements influencing the measurement result are considered,and the measurement accuracy is improved.

Description

Technical field [0001] The present invention relates to a nuclear radiation detection technique, particularly a method and apparatus for measuring soil porosity using electrostatic collection measuring instrument. Background technique [0002] The soil porosity is the ratio of the pore volume between the soil particles accounts for the total volume of the soil. Soil porosity is an important indicator reflecting soil characteristics. The soil porosity is measured in the prior art, and the soil porosity, soil pressing method, soil capacity and specific gravity calculation method and image treatment method have certain limitations. There is a limit of measurement accuracy, data error obtained. Larger, complex operation, etc. [0003] Experience is calculated from other soil indicators (natural weight, water content, water relative density, water) conversion, most of the indicators (natural weight, water content, soil relative density) will have Error, the error in the conversion pro...

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Problems solved by technology

In addition, determining the soil particle density of different soil textures is labor-intensive and time-consuming. Usually, the bulk density of the quartz sand sample is used as a typical reference value, which virtually increases the error of the measurement data.

[0004] Patent document CN107741391A discloses a method for measuring soil porosity, which uses the relationship between resistivity and soil porosity to obtain soil porosity by measuring soil resistivity. This method does not need to destroy the original soil during the sampling measurement process. With structure, the original density, water content and other elements of the soil can be preserved to the greatest extent, but this method still has complex calculations. It is necessary to establish a relationship model between soil porosity and soil resistivity, and the model is a rough estimation model. Introduced errors, affecting the calculation accuracy

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