A Miniature Time Domain Reflectometry Soil Moisture Sensor

Abstract

The invention discloses a micro time-domain reflecting soil moisture sensor. The sensor comprises an insulation core column, two electronic pulse protection rods and a fixed bracket, wherein the insulation core column and the two electronic pulse protection rods are uniformly fixed to one end surface of the fixed bracket, and the insulation core column is arranged between the two electronic pulse protection rods; an electronic pulse strip-shaped double-helix transmission wire is wound on the insulation core column; the free end of the electronic pulse strip-shaped double-helix transmission wire extends into the fixed bracket and is connected with one end of an electronic pulse inlet-outlet wire variation indication point arranged in the fixed bracket; the other end of the electronic pulse inlet-outlet wire variation indication point is connected with a sensor connecting wire. The soil moisture sensor disclosed by the invention is not only suitable for homogeneous soil, but also has high adaptability to the soil with high gravel content; compared with the conventional soil moisture sensor based on a time-domain reflecting principle, the measurement precision can be improved, the adaptability can be enhanced, and the research equipment level in the soil moisture migration field in China is improved.

Description

technical field [0001] The invention relates to a miniature time-domain reflection soil moisture sensor, which belongs to the field of soil environment. Background technique [0002] Soil water content is often used to study the process, law and mechanism of soil water movement. At present, the determination of soil water content has become the basic and frontier research field of related disciplines such as soil science, ecology, water resources science and resource and environmental science, and has been paid more and more attention. The soil moisture sensor designed based on the time domain principle is the data acquisition equipment used to measure the soil moisture content, which is a widely used sensor type in the field of soil moisture measurement. This type of soil moisture sensor is limited by the current resolution accuracy of electronic pulse changes. The minimum length of the cylindrical waveguide rod for propagating electronic pulses is about 15cm. It is diffi...

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Problems solved by technology

This type of soil moisture sensor is limited by the current resolution accuracy of electronic pulse changes. The minimum length of the cylindrical waveguide rod for propagating electronic pulses is about 15cm. It is difficult for the moisture sensor to be completely inserted into the soil, and the probability of the sensor being in contact with gravel is high, which severely limits the application of the time-domain soil moisture sensor in this type of soil. Under the condition that the sensor is completely inserted into the soil, the measurement accuracy is also difficult to guarantee

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