Time domain reflection based soil water measuring method

A soil moisture and measurement method technology, applied in the field of agricultural informatization, can solve the problems that cannot be eliminated, different phases, etc., and achieve the effects of small error, simplified circuit, and strong portability

Inactive Publication Date: 2013-07-17
CHINA AGRI UNIV
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Problems solved by technology

The disadvantage of this method is that when the signal first reaches the circulator, there will be a reflected signal, and there will be a reflected signal after reaching the probe, so the final reflected signal is the superposition of these two sine waves with the same frequency, different phases, and different amplitudes. Therefore, errors always exist and cannot be eliminated

Method used

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  • Time domain reflection based soil water measuring method

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[0012] specific implementation plan

[0013] The present invention will be further described below by accompanying drawing:

[0014] In Figure 1, the high-frequency multi-harmonic signal source (1) can generate a 10MHz square wave, and the rising edge of the generated square wave is lower than 1ns. After passing through the pulse shaping circuit (7), it is transmitted to the Two-way directional coupler (2), where the signal is separated, and a part of the signal is coupled to the time difference chip (3) through one of the coupling ends of the two-way directional coupler (2), as a reference signal, and the rest of the signal continues along the Transmission through the coaxial cable (4), in order to match the impedance of the connection between the coaxial cable (4) and the probe (6) and reduce the reflection here, after an impedance transformation, it is then transmitted to the probe (6). The characteristic impedance of the probe (6) in the soil also matches the coaxial cabl...

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Abstract

The invention discloses a time domain reflection based soil water measuring method, and belongs to the agricultural informatization field. A structure for realizing the method includes a high-frequency multi-resonant signal source module, a bidirectional coupler module and a time difference chip module. A bidirectional coupler is adopted in the invention to measure the time difference between an incident signal and a reflection signal in order to measure the water content of soil. The structure has a smaller error than other TDR (time domain reflectors), and has a strong portability.

Description

technical field [0001] The invention discloses a soil moisture measurement method based on time-domain reflection, which belongs to the field of agricultural informatization. Background technique [0002] Soil moisture directly affects crop growth, field microclimate, and soil mechanical properties. In the fields of soil fertility, drought and moisture conservation, prevention and control of soil secondary salinization, swamp, gleization, environmental ecology, nutrient geochemical behavior, and the construction of stable and high-yield farmland, it is necessary to regularly observe and study soil moisture content and its dynamic changes. In agricultural production, the accurate determination of soil moisture content is very important for effective water resource management, irrigation practices, crop growth and chemical substance monitoring. Soil moisture is also an important indicator for studying agricultural drought and crop drought. In addition, soil moisture is a ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
Inventor 杨卫中卢娟
Owner CHINA AGRI UNIV
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