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| Development and experimental study of DPHP-FBG sensor for loess moisture content |
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Abstract The spatial and temporal dynamics of soil water content affects the migration of soil moisture and energy, and accurate monitoring of soil water content is of great significance to agricultural production, geological disaster prevention and engineering geological evaluation. Double Probe Peat Pulse (DPHP-FBG) method based on fiber Bragg grating is proposed, and a DPHP-FBG sensor is developed for the determination of water content of loess in Yan'an and the effects of different heating times and different heating powers on the results of the water content measurements are analysed. The study shows that the DPHP-FBG method can realize the accurate measurement of water content in unsaturated loess, especially suitable for monitoring low water content soils. When the heating time is controlled within 16 s at constant heating power, the measurement error decreases with the increase of heating time. The effect of heating power is small under sufficient heating time, so there is no need to use too high heating power. 30.15 W/m? heating power can achieve high accuracy of moisture content measurement when the heating time is 20 s. The DPHP-FBG method can realise remote, real-time, and fine monitoring of soil moisture content, which provides a new monitoring method for the study of in situ soil moisture field, soil moisture evaporation, and freezing and thawing. The DPHP-FBG method can achieve remote, real-time and fine monitoring of soil moisture content, providing a new monitoring method for the study of in situ soil moisture field, soil moisture evaporation and freeze-thaw.
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Received: 07 May 2024
Published: 19 March 2025
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2025, Vol. 46 
