Design and test of capacitive grain moisture sensor probe
Aiming at the problem of difficult installation of grain moisture sensor,a concentric circular planar capacitive moisture sensor probe was designed based on the edge capacitance effect.The feasibility was analyzed by establishing a simulation model,and the influence of probe structure changes on the measurement sensitivity and measurement range of the probe was analyzed by experiments,and the optimal combination of probe size results was finally determined.The sensitivity and measurement range of the sensor probe were optimal when the ratio of inter-electrode moment to width was 5 and the number of driving electrodes was 1.The experiments with wheat as the research object showed that there was a quadratic linear regression between wheat moisture content and output capacitance value,and the effect of temperature on output capacitance was investigated,and a wheat moisture prediction model was established with correlation coefficient R2 of 0.997 and root mean square error RMSE of 0.359 in the range of-5 ℃-40 ℃ and moisture content of 10％-30％.The designed sensor probe can meet the requirements of moisture content measurement accuracy of wheat in different periods,and provide a new sensor probe form and design method for wheat moisture detection.
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