Soil moisture measurement unit and method

A technology of soil moisture and measuring instruments, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of inability to realize soil moisture instrumentation design, immature measurement of reflection time difference, and inability to realize soil moisture, etc., and achieve fast test speed, Ease of mass production and low cost

Inactive Publication Date: 2008-07-09
CHINA AGRI UNIV
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Problems solved by technology

However, since the length of the soil probe usually does not exceed 20cm, the reflection time difference based on the TDR measurement principle based on soil moisture is much smaller than the reflection time difference of the cable fault diagnosis and location, and the conventional reflection measurement technology cannot realize th

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  • Soil moisture measurement unit and method
  • Soil moisture measurement unit and method
  • Soil moisture measurement unit and method

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Embodiment Construction

[0027] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] The theoretical basis of the present invention is to regard the soil and the measuring probe inserted into the soil as a section of transmission line, and determine the medium (herein the is the dielectric constant of soil), according to the dielectric constant, the moisture content per unit volume of the medium (here soil) is calculated by the TOPP formula.

[0029] This embodiment is to apply the above theory to measure the moisture content per unit volume in the soil. The above-mentioned medium in this embodiment is soil, and the soil moisture measuring instrument uses a pulse generator to generate a picosecond-level rising edge pulse. When the pulse acts on When the measuring probe is inserted into the soil-like porous medium, since the measuring probe has a certain waveguide impedance, according to the known electromagnetic...

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Abstract

The invention relates to a soil water content measuring instrument and a method. The instrument comprises a pulse signal generator for generating a pulse signal and transmitting the pulse signal to a measurement probe; the measurement probe for reflecting at the start end and the tail end after receiving the pulse signal to respectively generate two pulse reflection signals; a pulse detection circuit for detecting and sampling the two pulse reflection signals provided by the measurement probe to obtain two sampled pulse reflection signals; and a micro-control unit for obtaining the water content per unit volume of soil according to the two sampled pulse reflection signals. According to the invention, time domain reflection resulting from impedance mismatch between the start end and the tail end of the measurement probe is formed by using the pulse signal, and the actual water content per unit volume of the soil to be detected can be obtained by measuring the time difference of mirror reflection waves. The invention has the advantages of high measurement speed, high accuracy, low cost, easy batch production, etc.

Description

technical field [0001] The invention relates to the field of high-frequency measurement, in particular to a soil moisture measuring instrument and method. Background technique [0002] In the process of agricultural production, soil not only provides physical support for plant growth, but also serves as a nutrient bank for plant growth. Water is the lifeblood to ensure the growth of crops. A series of reactions in the soil, energy and material exchange are all related to water, which is directly related to crop yield and quality. TOPP (1980) gave the approximate relationship between soil dielectric constant and soil moisture content through experiments, called TOPP formula, and practice has proved that this experimental formula can achieve higher accuracy under different types and compositions of soil conditions ( 0.022m3m-3, Jacobsen and Schjonning, 1994). Therefore, the research on the measurement method of soil moisture content based on soil dielectric properties has at...

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Application Information

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IPC IPC(8): G01N23/00
Inventor 孙宇瑞王聪颖杨晔汪懋华马道坤张慧娟
Owner CHINA AGRI UNIV
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