Method and sensor for synchronous real time measuring water content and conductivity of soil
A soil moisture, real-time measurement technology, applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of large signal attenuation, difficult implementation, and inability to continuously output signals, to improve measurement accuracy, The effect of compact structure and large measuring range
Inactive Publication Date: 2008-09-17
CHINA AGRI UNIV
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Problems solved by technology
[0008] 3. It is difficult to realize and the price is high;
[0009] 4. A measurement takes a long time, at least 20 seconds
[0018] 1. Under the condition of high conductivity, the TDR method cannot measure soil moisture because the signal attenuation is too large; while the FD constant frequency decomposition method cannot accurately obtain moisture and conductivity because the phase angle is too small
[0019] 2. The signal cannot be output continuously, TDR takes about 1 minute for a measurement, and FD fixed frequency decomposition method takes at least 30 seconds
[0020] 3. The probe structure is mainly needle type, and there is no application of other structures
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[0052] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0053] The theoretical basis of the present invention is based on the mathematical model of the probe admittance calculation method, adopts the multi-frequency admittance decomposition method to directly measure the admittance of the probe, and then decomposes the real part and the imaginary part of the probe admittance, through the real part and the imaginary part of the probe admittance The relationship between the dielectric loss gives the conductivity of the porous medium, and the relationship between the imaginary part of the probe admittance and the dielectric constant gives the water content of the porous medium. At the same time, temperature detection provides basic temperature information of porous media on the one hand, and can be used to calibrate the influence of temperature on conductivity. The decomposition algorithm of the inventi...
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The present invention discloses a method for implementing synchronous real-time measurement of soil water content and electric conductivity based on dielectric theory and frequency domain method and its sensor. Said invention uses the mathematical model of probe admittance computational method as basis, and adopts multi-frequency admittance resolution method to directly measure probe admittance and temperature detection method to real-time measure soil water content and electric conductivity.
Description
technical field [0001] The invention relates to a method and a sensor for measuring soil moisture and electrical conductivity, in particular to a method and a sensor for simultaneously measuring soil moisture and electrical conductivity based on a dielectric theory and a frequency domain method. Background technique [0002] Soil 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. Soil conductivity is another important soil physical parameter. It is a comprehensive reflection of soil salinity, moisture, organic matter content, soil texture structure, etc. It plays a very important role in the research and application of farmland operations and environmental pollution. The current relevant sensing background technology is introduced from three aspects: [0003] 1. Rapid measurement of soil moisture based on dielectric theory [000...
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IPC IPC(8): G01N29/00G01R27/00
Inventor 孙宇瑞马道坤汪懋华曾庆猛
Owner CHINA AGRI UNIV