Method and device for measuring moisture in vertical section of farmland soil

Abstract

The invention discloses a moisture measurement method and device of a vertical section of farmland soil. The device is characterized by comprising a mounting pipe sleeve, a hollow cylindrical electrode, an insulating pipe column, a base band coaxial cable, a liquid-phase hollow water column, a resisting plate and a core processor; the moisture measurement device of the vertical section of the soil is controlled by a voltage-controlled oscillator to generate a high-frequency oscillation signal; a low-frequency square wave signal is obtained through silicon epitaxy high-frequency and low-noise amplitude amplification, and shaping and frequency division of a dual-modulus prescaler; accurate sensing of the volume moisture content of the soil is realized through a mathematical model between the frequency and the volume moisture content of the soil. A cylindrical stereoscopic type multilayered structure is adopted, and a moisture dynamic determination fitting and quantitative inversion technology of the vertical section of the farmland oil is integrated, so that the volume moisture convent of different heights of the vertical section of the farmland oil and the moisture supply amount of the soil of the vertical section are dynamically sensed in real time by utilizing the fewest layers; the moisture measurement method and device has the greatest advantages that the moisture condition of the vertical section of the soil can be continuously sensed in real time, the space integrity is strong and real-time calibration can be realized.

Description

technical field [0001] The patent of the present invention relates to a method and device for measuring the vertical profile of farmland soil. Through the equipment and method, the volumetric water content at different depths of the farmland soil profile and the water supply of the profile can be obtained quickly and non-destructively. Background technique [0002] Soil water content is easy to change with time and space, and its movement processes such as infiltration or evaporation are relatively complicated. However, real-time and accurate measurement of soil water content in the soil profile can grasp the three-dimensional distribution of soil water. The law of water provides strategies for the selection of optimal irrigation timing and threshold value and the establishment of precise irrigation system, and ultimately realizes water-saving irrigation. [0003] Most of the current soil moisture sensors are limited to the probe-type structure, and the length of the probe i...

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Problems solved by technology

[0003] Most of the current soil moisture sensors are limited to the probe-type structure, and the length of the probe is limited, so it can only measure the moisture content of the soil surface layer. To realize the moisture measurement of the soil profile, not only need multiple sensors interspersed in the soil layer, but the layout is difficult, time-consuming and laborious. The workload in the early stage is quite large, and the long-term continuous measurement, the probe is easy to corrode, which affects the measurement accuracy, and the soil profile is interspersed with multiple sensors, and the simultaneous work will also lead to high power consumption.

[0004] For the sensing measurement of soil profile moisture, foreign countries have begun to carry out relevant research and formed related products, while domestic research in this area has just started, and the current deployment of sensitive elements of soil profile moisture sensors are regularly installed at intervals , did not distribute according to the distribution characteristics and changing rules of soil vertical profile moisture and actual needs. At the same time, the calibration problem in the measurement process has always been a problem that needs to be solved by the soil vertical profile moisture sensor.

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