| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the particle diameter distribution of a group of particles by adopting an analysis part storing the shifting procedures of a particle diameter section and the subdivision procedures of a particle diameter division. SOLUTION: An initial particle diameter section S1 that is composed of continuous particle diameter sections T is set, whose number is equal to or less than the number of photo detectors where the minimum and maximum particle diameters are set to lower and upper limits, respectively. When the probability density of each of the particle diameter sections T is obtained so that a prediction scattering energy vector for the probability density coincides with an actually measured scattering energy vector to the maximum within a range where the probability density of the particle diameter section T does not become negative. Hence when either probability density out of the maximum particle diameter section Tmax and the minimum particle section Tmin exceeds a specific value, the particle diameter distribution of the group of particles is obtained based on new particle diameter sections S2, S3,... being obtained by shifting the particle diameter section where the prediction scattering energy vector coincides with the actually measured scattering energy vector to the maximum to large and small particle diameter sides when the probability density of the maximum particle diameter section and that of the minimum particle diameter section exceed specific values, respectively, by one particle diameter section. The calculation procedure is stored in the analysis part is advance.
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