Soil water content correction device and correction method thereof

Abstract

The invention relates to the field of soil moisture content measurement, and discloses a soil moisture content correction device and a correction method thereof, the soil moisture content correction device comprises a thermal resistor, a printed circuit board and a probe; the printed circuit board comprises a moisture detection circuit and a temperature detection circuit, the moisture detection circuit is used for detecting the moisture content of soil, and the temperature detection circuit is used for detecting the temperature of soil; the probe is electrically connected with an excitation electrode of the moisture detection circuit, a shell of the thermal resistor is electrically connected with a ground electrode of the moisture detection circuit, and a lead of the thermal resistor is electrically connected with the temperature detection circuit. The invention provides a soil water content correction device. Synchronous detection on the moisture content and the temperature of the same position can be realized; the measured output voltage of the moisture detection circuit, the soil temperature and the temperature of the environment where the printed circuit board is located are substituted into a soil moisture content temperature influence correction formula corresponding to the temperature, soil moisture measurement can be achieved, especially correction of frozen soil unfrozen water content measurement can be achieved, and the measurement precision can be effectively improved.

Description

technical field [0001] The invention relates to the field of soil water content measurement, in particular to a soil water content correction device and a correction method thereof. Background technique [0002] Soil moisture content is an important physical parameter of soil, which is of great significance to the growth of plants. At the same time, for permafrost, during the process of soil freezing and thawing, the change of groundwater phreatic level and the movement of water and solute (salt) in the soil are obviously affected by the law of soil freezing and thawing. In areas with high salt content in groundwater, it will also cause secondary salinization of soil. When the soil freezes, the water changes from liquid to solid and its volume increases, which causes the volume of the soil to expand, resulting in frost heave. When the soil melts, the volume of the soil decreases, and the phenomenon of thawing will also occur. The stress and deformation caused by frost hea...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned technical defects and application requirements, this application proposes a soil moisture content correction device and its correction method to solve the problem that the existing dielectric soil moisture sensors are affected by temperature during measurement, especially in frozen soil. defects that cause errors

Images