Japan as Represented by Director General of Agency of Industrial Science

Kensei Ebara

Shoichiro Shin

An apparatus for measuring particle size distribution comprises an electric mobility classifying section (,) that comprises an outside electrode (,), an inside electrode (,) and an annular cylindrical hollow portion (,) defined by the outside and inside electrodes, a particle size measuring section (,) that is disposed under the electric mobility classifying section for measuring particle size distribution, and a guide frame (,) that allows the electric mobility classifying section and the annular cylindrical hollow section to communicate with each other. A sample gas containing charged particles under measurement is supplied from above into the annular cylindrical hollow section of the electric mobility classifying section to classify the particles according to their electric mobilities. The gas containing the classified particles is supplied into the particle size measuring section via the guide frame to directly obtain approximate particle sizes. The number of charges of the particles is obtained from the electric mobility and the approximate particle sizes. Precise particle sizes are determined from the number of charges and the electric mobilities.

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Tsukuba, Japan

Kensei Ebara