Planting environment moisture detection method

Abstract

The invention discloses a method for detecting moisture in a planting environment. The steps are to firstly detect at least one planting environment sample to obtain the initial conductivity and the initial dielectric constant of the sample, and inject a certain amount of water into the planting environment sample to change its Humidity ratio, and then test again to obtain the varying conductivity of multiple samples and the varying dielectric constant of multiple samples, and then calculate the initial conductivity of the sample, the initial dielectric constant of the sample, the varying conductivity of each sample, and the varying dielectric constant of each sample To generate multiple comparison values, and extract the relatively close part of each comparison value to generate at least one regression value; in addition, take at least one planting sample to be inspected that is consistent with the planting environment sample for testing to obtain the electrical conductivity and medium to be inspected. The electrical constant, and the electrical conductivity to be checked, the dielectric constant to be checked, and the regression value are calculated to obtain the moisture content of the planting sample to be checked, so that the present invention can accurately measure soil moisture.

Description

technical field [0001] The invention relates to a method for detecting moisture in a planting environment, in particular to a method for detecting moisture in a planting environment that can accurately measure soil moisture. Background technique [0002] Press, in order to be able to measure the moisture content of the soil for intelligent control, or real-time monitoring, etc., there are various conventional moisture measurement methods, and the current relatively mature technology is Time Domain Reflectometry (TDR) , and Frequency Domain Reflectometry (FDR). [0003] Soil is a mixture of granular solids, air, and water. The dielectric constant of air is about 1, and the dielectric constant of water is about 80. Therefore, the dielectric constant of soil varies with its water content. However, it is found through actual experiments that the conductivity of the soil will be affected by different fertilization degrees, and when the actual moisture content reaches a certain l...

AI Technical Summary

Problems solved by technology

[0005] where K' and K" represent the real and imaginary parts of the permittivity, respectively; σ dc is the conductivity; ε 0 is the dielectric constant in free space (vacuum) = 8.85×10 -12 m -3 kg -1 the s 4 A 2 ; f is the frequency of the stimulus signal, it can be seen that when σ dc When it is very large, it will cause a large measurement error

[0006] The "Topp Empirical Formula" calculates the equivalent soil volume moisture content of a solution with a dielectric constant of ε, calibrates the sensor and evaluates the performance of the sensor. The formula is: Θ ν =-5.3x10 -2 +εx2.92x10 -2 -ε 2 x5.5x10 -4 +ε 3 x4.3x10 -6 , and Θ ν is the equivalent soil volume moisture content of the solution. Although the "Topp Empirical Formula" can use the real part K of the dielectric constant to deduce the soil moisture when the soil is completely non-conductive, the conductivity of the general planting loam cannot be Zero (fertilizers will increase soil conductivity), so the "Topp empirical formula" cannot be directly applied due to some errors

Images