A distributed measurement method and system for soil moisture content

Abstract

The invention discloses a distributed soil moisture content measuring method and system. The method comprises the following steps: implanting a carbon fiber cable into soil, carrying out electrifying and heating, carrying out demodulation, recording temperature data by utilizing a DTS (distributed fiber temperature measurement system) demodulator, solving a temperature characteristic value of the carbon fiber cable by utilizing data analysis software, and substituting the solved temperature characteristic value into a linear function, namely w=k*Tt+b, determined by a calibration test so as to calculate the soil moisture content, wherein w is the soil moisture content, Tt is the temperature characteristic value of the carbon fiber cable, and k and b are constants. The system comprises the carbon fiber cable, a heating power supply, the DTS demodulator and a computer with the data analysis software. The method and the system can be used for carrying out in-situ distributed measurement on the soil moisture content and have the advantages of distributed measurement, long measuring distance, simplicity in installing, high measurement precision and stability, good cost performance and the like.

Description

technical field [0001] The invention relates to the technical field of soil environment measurement, in particular to a method and system for distributed measurement of soil moisture content. Background technique [0002] Soil moisture content is the ratio of the water mass in the soil to the corresponding solid matter mass, which is the basis of relevant scientific research and engineering practice. Construction and other aspects are of great significance. [0003] Regarding the determination of soil moisture content, there are currently three main methods: drying method, electrical resistance method, and time domain reflectometry (TDR). [0004] The drying method is the most common and convenient method for measuring the moisture content in soil. Its principle is to determine the moisture content according to the mass change of the soil sample before and after drying. However, this method requires sampling and drying, so it is suitable for laboratory testing and is very ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a distributed measurement method and system for soil moisture content. Based on DTS technology, using the characteristics of heating and temperature sensing in the carbon fiber optic cable, the soil moisture content is determined by the temperature characteristic value in the heating process of the carbon fiber optic cable. It solves the shortcomings of existing soil moisture content determination methods, such as difficulty in measuring in-situ soil moisture content, complicated calibration, poor stability, and inability to perform distributed measurement of soil in-situ moisture content.

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