| 摘要 |
PROBLEM TO BE SOLVED: To automatically, rapidly, accurately, and continuously measure the diameters of particle that travels by a belt conveyor, that is the manufacturing line of the particle. SOLUTION: The surface of a particle layer B (crystal salt layer), traveling on the belt conveyor A, is smoothed by a rectifying plate C. The displacement in the surface of a particle layer B1 whose surface is smoothed is measured at a high speed in the order of ms for each minute length to obtain a voltage signal by an optical displacement meter E. The voltage signal of the optical displacement meter E is read by a data collection apparatus F for speedily reading the signal as a displacement output value. A displacement difference, that is the absolute value of the displacement output value difference between minute length, is calculated successively from the change in a displacement output value and is averaged to calculated the average displacement difference, and the average particle diameter is calculated from the relationship between the average particle diameter and the average displacement difference of the particle that has been made in advance.
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