Abstract
ABSTRACT GRAIN velocity probes were developed and used to measure the velocities of grain on a rotating disk and in a free-fall grain stream. Each probe consisted of two photo-detectors spaced at a fixed distance and four to seven infrared-emitting diodes. By cross-correlating the signals generated by the two detectors, the transit time required for the grain kernels to travel the distance between the detectors was determined. From the values of transit time and the known distance between the detectors, velocities of grain ranging from 2 to 9 m/s, were measured within an accuracy of 10%.
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