Experimental analysis on the variation law of sensor monitoring accuracy under different seeding speed and seeding spacing

Abstract This study is about testing the accuracy of the sensor to monitor the seeding parameters of the precision metering device under different seeding speeds and seeding spacings. The purpose is to discover the change law of the sensor's monitoring accuracy of a single seed flow under different seeding speeds and seeding spacings. In particular, it is explored to improve the accuracy of the seeding parameter monitoring sensor under the conditions of high seeding speed and small seeding distance. In this study, three types of sensors were selected for testing, including two infrared optoelectronic sensors and one high-frequency radio wave sensor. The same monitoring system is used to test the monitoring accuracy of the three main parameters of seeding quantity, qualified rate, and missed rate. The test was carried out at five speeds and three spacings gradient levels. The results showed that the three different sensors have similar changes in the parameter monitoring of the seeding quantity relative error, the qualified rate, and the missed rate. When the seeding speed is high and the seeding spacing is small, the change of the sensor monitoring accuracy is very obvious. The significant difference is most obvious when the speed is ≥ 14 km/h and the spacing is ≤ 20 cm. Further analysis found that the frequency of seeds passing through the sensor is the most direct factor that affects the accuracy of sensor monitoring. As the frequency increases, the sensor monitoring accuracy gradually decreases, especially after the frequency reaches 25.92 seeds/s, the sensor monitoring accuracy drops sharply, showing a leaping change. Therefore, improving the accuracy of the sensor's monitoring of the seed passing frequency is of great help to the improvement of the seeding monitoring accuracy under the conditions of high seeding speed and small seeding spacing.