Soil humidity sensor based on oscillation circuit and working method of soil humidity sensor

Abstract

The invention relates to the field of geology detection equipment and discloses a soil humidity sensor based on an oscillation circuit and a working method of the soil humidity sensor. Two electrode plates and soil located between the two electrode plates are taken as a capacitor, a dielectric constant of the soil can be obtained through backstepping based on the obtained frequency value of the oscillation circuit by the use of the relation between the frequency and the capacitance of the oscillation circuit and the relation between the capacitance and the dielectric constant, the humidity value of the soil is further obtained, accordingly, the defect of low linearity of transmission FDR and TDR can be overcome, the soil moisture can be rapidly, accurately and stably measured. Besides, the soil humidity sensor further has the characteristics that the circuit structure is simple, the cost is low, the application is convenient and the like, is high in practicability and facilitates actual popularization and use.

Description

technical field [0001] The invention relates to the field of geological detection equipment, in particular to a soil moisture sensor based on an oscillation circuit and a working method thereof. Background technique [0002] Existing soil moisture measurement methods are mainly based on TDR (Time-Domain Reflectometry, time-domain reflectometry) and FDR (Frequency-Domain Reflectometer, frequency-domain reflectometry). Among them, the working principle of TDR technology is to use the characteristics of different transmission rates of electromagnetic waves in media with different dielectric constants. By accurately measuring the time difference of electromagnetic waves from the sending end to the receiving end, the transmission rate of electromagnetic waves in the soil can be obtained, and the medium can be reversed. Electric constant, and then get the soil volume water content (ie humidity value). The FDR technology uses the electromagnetic pulse principle to measure the appa...

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Problems solved by technology

[0004] Aiming at the aforementioned problems in the prior art, the present invention provides a soil moisture sensor based on an oscillating circuit and its working method. plate capacitor, and then use the relationship between the frequency of the oscillating circuit and the capacitance value and the relationship between the capacitance value and the dielectric constant. By obtaining the frequency value of the oscillating circuit, the dielectric constant of the soil can be inversely obtained, and then the moisture value of the soil can be obtained. Eliminate the defects of low linearity in traditional FDR and TDR methods, and quickly achieve fast, accurate and stable measurement of soil moisture

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