Method for measuring water content of soil by adopting time length measurement technology

A technology for measuring soil water content and technology, which is applied in the field of measuring soil water content by using time measurement technology, which can solve the problems of high cost, high price, and inability to buy chips, and achieve the effect of stable measurement results.

Inactive Publication Date: 2014-08-27
CHINA AGRI UNIV
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Problems solved by technology

Disadvantages: high cost, China cannot buy chips
Disadvantages: High-spee

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  • Method for measuring water content of soil by adopting time length measurement technology
  • Method for measuring water content of soil by adopting time length measurement technology
  • Method for measuring water content of soil by adopting time length measurement technology

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Embodiment Construction

[0029] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0030] The idea of ​​the present invention to solve the problem is: firstly, prepare the soil to be tested, and insert the double V-shaped soil probe into it; secondly, send a high-frequency electromagnetic wave to the soil probe, and thirdly, compare the phases of the electromagnetic waves at the sending end and the receiving end The difference can accurately calculate the transmission time of electromagnetic waves in the probe, and finally calculate the soil moisture content according to the fitting formula of the relationship between transmission time and soil water content. figure 1 is a circuit diagram of a method of measuring soil water content using the chronometry technique.

[0031] The device for measuring s...

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Abstract

The invention discloses a method for measuring the water content of soil by adopting a time length measurement technology in the field of measurement for the water content of soil, which aims at solving the problems of conventional researches in the field of measurement for the water content of soil. The method comprises the following steps of firstly, inserting a double-V soil probe into prepared soil to be measured; secondly, transmitting a high-frequency electromagnetic wave to the soil probe; thirdly, comparing the phase difference of the electromagnetic waves at a transmitting end and a receiving end to accurately calculate the transmission time of the electromagnetic waves in the probe, and finally calculating the water content of the soil according to a fitting formula of a relationship between the transmission time and the water content of the soil. According to the method, the limits of complexity, low accuracy, difficulty in the implementation of a hardware circuit and the like of a conventional soil water content measurement method in practical application are broken, and the method for measuring the water content of the soil by adopting the time length measurement technology is effectively implemented.

Description

technical field [0001] The invention relates to the field of measuring soil water content, in particular to a method for measuring soil water content by using a time measurement technique. Background technique [0002] At present, the most advanced and popular method of measuring soil water content in foreign countries is the Time-Domain Reflectometry (TDR) method, which is the most real-time, fast and accurate soil moisture measurement. technology. The TDR instruments currently used by my country's production and scientific research units are mainly imported from the United States, Canada and Germany. In 2006, China Agricultural University's "Eleventh Five-Year Plan" 863 plan project "Soil Parameter Time Domain Reflectometer (TDR) Key Technology Research" was the first to develop and develop a soil moisture tester based on the principle of time domain reflectometry in China. And made a breakthrough, but due to the lack of high-precision, fast, highly integrated chips, the...

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Application Information

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IPC IPC(8): G01N23/00
Inventor 石庆兰冯磊徐云董乔雪孙明高万林杨丽丽
Owner CHINA AGRI UNIV
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