Soil three-parameter measuring method and system

Abstract

The invention relates to a soil three diameter measuring method, which is as follows: the water content and electrical conductivity of the soil are calculated by measuring high frequency signals and an alternating voltage formed by the superposition of reflected signals formed on a probe; the soil temperature information is obtained by a temperature pickup arranged in the probe; the obtained electrical conductivity is calibrated; therefore, the measurement of the soil three diameter is finished. The soil three diameter measuring system comprises a signal generation unit, a transmission unit, the probe, a signal processing unit, and a control unit; wherein, the signal generation unit is used for transmitting high frequency signals of fixed frequencies. The probe is used for forming the reflected signals after receiving the high frequency signals and is provided with the temperature pickup. The signal processing unit is used for processing and treating voltage signals. The control unit is used for calculating the water content and electrical conductivity of the soil according to an embedded formula and calibrating the electrical conductivity according to the soil temperature information. The method and the system of the invention have fast measuring speed, high precision, strong anti-soil type and salt content influent capability, wide application range and low production cost.

Description

technical field [0001] The invention relates to the technical field of soil environment information measurement, in particular to a soil three-parameter measurement method and system. Background technique [0002] Soil water content, electrical conductivity and temperature are three important parameters of soil, and they can reflect rich information of soil. TDR (Time domain reflectometer, time domain reflectometry), FDR (Frequency domain reflectometer, frequency domain reflectometry) and ADR (Amplitude-domain reflectometry, amplitude reflectometry) are currently the main methods for measuring soil dielectric constant. The TDR method uses a high-precision pulse generation detection circuit to detect the time difference of the reflected wave of the high-frequency electromagnetic wave at the connection between the coaxial cable and the probe and the connection between the probe and the soil, thereby calculating the moisture content of the soil; Continuous frequency electromag...

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Problems solved by technology

[0003] Many instruments based on the above principles have been widely used. TDR instrument measurement is fast and accurate, but it is relatively expensive in cost due to the need for a precise pulse time detection circuit; FDR method, although relatively low in price, but its measurement The results are easily affected by the salinity and soil voids in the soil; there is also a standing wave method, which has a better scope of application, and the price is more advantageous than TDR and FDR, but currently only one can be measured by this method Soil parameters, so it is difficult to reflect more information in the soil, and it is difficult to meet the demand for simultaneous measurement of multiple soil parameters

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