Tube-pin-type soil moisture content detection method and device based on frequency domain reflectometry
A technology of soil moisture content and frequency domain reflection, applied in the field of soil moisture content detection, to achieve the effects of accurate measurement, low device cost and simple structure
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[0039] Hereinafter, the present invention will be described in detail with examples in conjunction with the accompanying drawings to further illustrate the purpose and characteristics of the present invention, but the embodiments of the present invention are not limited thereto.
[0040] The theoretical basis of the present invention is to use frequency domain reflection method to detect soil dielectric properties to reflect soil moisture content. This embodiment uses this theory to measure soil moisture content. In this embodiment, the medium is soil, and the pipe-pin type soil moisture content detection device uses a high-frequency signal to excite the circuit 3 to generate a high-frequency signal, which is transmitted to the pipe-pin type soil moisture content probe 1 through a 50Ω coaxial connection line 2, using high frequency The impedance of the soil and pipe-pin type soil moisture content probe 1 does not match the impedance of the 50Ω coaxial connection line 2 to produce...
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