The Effect of Shape on Intermethod Correlation of Techniques for Characterizing the Size Distribution of Powder. Part 2: Correlating the Size Distribution as Measured by Diffractometer Methods, TSI‐Amherst Aerosol Spectrometer, and Coulter Counter

In an aerosol spectrometer the size of a powder grain is measured from the time‐of‐flight of the fineparticle between two laser beams. Due to the flow conditions, irregularly shaped fineparticles align themselves along the direction of flow of the air stream carrying them across the gap between the laser beams. The size distribution measured therefore varies with the shape of the fineparticles. This fact is demonstrated by comparing size distributions generated by image analysis, electrozone stream counter, diffractometer, and time‐of‐flight aerosol spectrometer.