| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for measuring a continuous falling dust having proper correlation with respect to a dust falling speed measuring value due to a deposit gauge, capable of measuring a dust falling speed in a short cycle and capable of continuously measuring a particle size distribution. SOLUTION: The device has aβ-ray absorbing type mass measuring instrument for individually perform continuous mass measurement with respect to coarse and fine particles, by arranging an inertial classifier on the way of the air flow passage and circulating air flow passage circulated through an upward opened funnel-shaped particle collecting port and a measuring instrument, and calculating the dust falling speed transition of the falling dust in the atmosphere from a coarse particle mass measured value. COPYRIGHT: (C)2008,JPO&INPIT
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