Method and device for detecting moisture content and electric conductivity of soil

Abstract

The invention relates to a method and device for detecting moisture content and electric conductivity of soil. The method comprises the following steps: inserting two soil moisture content detecting electrodes into the detected soil; inserting two soil electric conductivity detecting electrodes between the two soil moisture content detecting electrodes; alternately and circularly applying two sine excitation signals with different frequencies to the detected soil; respectively obtaining output voltage values of the detected soil under the two sine excitation signals with different frequencies, calculating a resistance value and a capacitance value of the detected soil by virtue of the output voltage values and solving the soil moisture content according to the resistance value and the capacitance value; and obtaining voltage values and current values of the two soil electric conductivity detecting electrodes under the sine excitation signals with any frequency and solving the electric conductivity of the soil by combining distance parameters between the soil moisture content detecting electrodes and the soil electric conductivity detecting electrodes. The method and device for detecting the moisture content and the electric conductivity of the soil are suitable for quick detection of the moisture content and the electric conductivity of the vehicle-mounted large-area soil and are capable of greatly improving the detection efficiency and reducing the detection cost.

Description

technical field [0001] The invention relates to the technical field of soil moisture content and electrical conductivity detection, in particular to a soil moisture content and electrical conductivity detection method and detection device based on dual-frequency alternating excitation. Background technique [0002] There are many detection methods of soil moisture content, such as the drying weighing method of collecting soil samples and weighing, which can not only obtain the mass moisture content of the soil, but also obtain the volume moisture content of the soil. It is based on the neutron attenuation method that water has a strong attenuation characteristic for neutron energy. According to the different soil moisture content, the resistance is also different. According to the dielectric constant of water (generally about 80 at normal temperature) and the dielectric constant of soil skeleton (generally between 3 and 5 at normal temperature) and the dielectric constant o...

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Problems solved by technology

However, subject to the measurement principle of electromagnetic induction, the relative position of the instrument, the environmental electromagnetic field, and even the metal accessories attached to the human body will cause large errors in the detection.

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