Abstract
The real-time seed-metering device performance detection is one of key techniques to ensure operation quality of a planter. A crossed E-shape plate capacitance sensor, a parallel-plate capacitance sensor and a differential tri-plate capacitance sensor, are proposed to test corn-seed flow. The detection concept and sensor structure parameters are presented. An adjustable stand is designed to investigate the impact of sensor structure and seed velocity on the outputs of capacitance sensors. The sensitivity and the feasibility of 3 sensors are studied by detecting capacitance variations at different corn-seed speeds. Experimental results show that, with average capacitance variation 0.1245pF and 0.1115 pF, respectively, the crossed E-shape plate sensor and the differential tri-plate sensor are suitable to measure corn-seed metering device performance.
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