A soil moisture content calculation method based on optical fiber temperature measurement technology

CN121275832BActive Publication Date: 2026-06-05HUBEI UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUBEI UNIV OF TECH
Filing Date
2025-09-28
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing fiber-optic-based methods for measuring soil moisture content are cumbersome to operate, time-consuming and labor-intensive in laboratory calibration, and have poor formula adaptability, making it difficult to quickly adapt to the measurement needs of different regions and types of soil, thus affecting measurement accuracy and universality.

Method used

By obtaining the thermal conductivity, density, and porosity of dry soil in the target area, as well as the thermal conductivity and density of water, as basic soil parameters, and using the active heating method to obtain temperature measurements, a soil moisture content formula is constructed. Based on the steady-state heat conduction equation of the soil, the relationship between thermal conductivity and temperature is characterized, simplifying laboratory operations and enabling in-situ measurements.

Benefits of technology

It simplifies laboratory operations, improves measurement accuracy and versatility, and can quickly and accurately calculate soil moisture content, adapting to the measurement needs of different regions and types of soil.

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Abstract

The application provides a soil moisture content calculation method based on an optical fiber temperature measurement technology, and comprises the following steps: obtaining the dry soil thermal conductivity coefficient, dry soil density and porosity of a target area, and the thermal conductivity coefficient and density of water in the target area as soil basic parameters; obtaining the temperature measurement value of the target area at different radial distances after heating to a steady state based on an active heating method; and substituting the soil basic parameters and the temperature measurement value into a soil moisture content formula to obtain the soil moisture content of the target area; wherein the soil moisture content formula is pre-constructed based on a soil steady-state heat conduction equation and the relationship between the thermal conductivity coefficient and the soil basic parameters, and represents the relationship between the thermal conductivity coefficient, the temperature and the soil moisture content of the soil. The application simplifies the complicated laboratory operation required by the existing active heating method by constructing the soil moisture content formula representing the relationship between the soil basic parameters, the temperature measurement value and the soil moisture content.
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Citation Information

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