Design and Performance Analysis of Top Soil Moisture Measurement Device Based on Capacitance Method
A capacitive-based surface soil moisture sensor is designed to address the issues of slow speed and low efficiency in surface soil moisture measurement.Unlike traditional insertion-based measurement methods,a co-planar inter-digitated capacitive probe is designed and fabricated to achieve rapid measurement of surface soil moisture.Sandy loam soil from the Langfang area of Hebei Province was used as the experimental soil sample.The sensor output values were calibrated using polynomial fitting,achieving a determination coefficient of 0.981 77.The dynamic response,stability,and sensitivity tests of the sensor meet the monitoring requirements.The impact of environmental temperature changes on the sensor output is analyzed,and a linear fit between the sensor output and temperature was determined with a determination coefficient of 0.984 57.Furthermore,the sensitive measurement area of the sensor is determined through experimental testing,and its longitudinal influence range is found to be 4 cm.Comparative experiments with the TRIME-PICO64 insertion type soil moisture sensor show that the performance of the designed sensor is comparable to that of similar foreign products but has a higher cost-effectiveness.Finally,through comparative experiments and analysis,the designed soil moisture sensor is concluded to enable rapid measurement of surface soil moisture and effectively solve the problem of low efficiency in measuring flowing water in surface soil.
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