Method and apparatus for determining the size distribution of suspended particulate matter in the atmospheric air

摘要

Suspended particulate matter in the atmospheric air is sucked into a container 1 by a pump 2. The suspended particulate matter in the atmospheric air in the container is electrically charged so as to electrically collect it. The collected suspended particulate matter is irradiated with laser beams under the condition that the collected suspended particulate matter P is dispersed at an appropriate concentration. A spatial intensity distribution of diffracted and scattered light obtained by irradiating laser beams to the suspended particulate matter is measured. A particle size distribution of the suspended particulate matter P is found from the result of measurement.