In this study, an ultrasonic sensor was applied for sensing the rice depth in an experimental cylindrical bin. The experimental result is used as a reference to estimate the amount of stored rice for operator’s on-site inspection. During the experiment, the ultrasonic sensor was arranged for vertical to bin bottom and to the slope of a cone. During loading the rice, the input rice weight keeps a good linear relationship with the grain depth detected by the ultrasonin sensor With the detected grain depth to estimate the stored rice volume, the weight of stored rice can be predicted by multiplying rice bulk density.
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