Pottery clay dielectric capacitance type soil matrix potential measurement method

Abstract

The invention discloses a pottery clay dielectric capacitance type soil matrix potential measurement method and belongs to the technical field of soil matrix potential measurement. The pottery clay dielectric capacitance type soil matrix potential measurement method is characterized by comprising the following steps: converting the variation quantity of soil matrix potential into the variation quantity of measurable capacitance by taking a water-permeable and air-impermeable novel pottery clay material as a capacitance type sensor; converting the variation of the capacitance into the variation of square wave frequency based on a principle of a frequency oscillator; carrying out high-precision measurement on the frequency by applying a direct frequency measurement method; carrying out data fitting to finish the measurement of the soil matrix potential. Compared with the prior art, the sensor based on a capacitance principle has the advantages of high precision, strong anti-interference capability, low learning and utilization cost and the like and is suitable for most soil measurement conditions. The sensor can be used for a long period after being mounted for one time and distributed measurement can be realized; data is processed to obtain space distribution of the soil matrix potential. The method disclosed by the invention provides a novel thought for hydrological researches in China and has very high scientific value.

Description

technical field [0001] The invention relates to a soil matrix potential measurement method, in particular to a soil matrix potential measurement method based on the capacitance principle of a clay medium, and belongs to the technical field of soil matrix potential measurement. Background technique [0002] The soil matrix potential refers to the potential energy caused by the adsorption force and capillary force of the soil matrix under unsaturated conditions, and is the main component of the soil water potential. At present, the study of soil matric potential has become the basic and frontier research field of soil science, ecology, water resource science, resource and environmental science and other related disciplines, and has been paid more and more attention. [0003] The method for directly measuring soil matric potential is mainly based on mercury negative pressure gauge. For example, the publication number is CN204832185U, an invention patent named "a scaled water po...

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Problems solved by technology

[0006] Aiming at the problems of troublesome use, complicated process, instability, high price and incapability of large-scale promotion in existing soil matric potential measurement methods, the present invention proposes a multi-point measurement method with high precision and strong anti-interference ability, which is easy to learn and use. Low cost, ceramic medium capacitive soil matric potential measurement method based on capacitance principle, suitable for most soil measurement conditions

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