The Area Diameter (also known as the Equivalent Disc Diameter, (ED)) is the diameter of a circle having the same area as the particle.
Correlates with laser diffraction measurements
The Inner Diameter is the diameter of the maximum inscribed circle (the maximum circle lying completely inside the particle).
Correlates with sieve analysis measurements
Circularity is defined as the ratio between the equivalent disc perimeter and the particle perimeter.
The degree to which the projection area of the particle is similar to a circle, considering the smoothness of the perimeter.
It is often used
for product flow studies
The Bluntness Index is the expression of a “maturity in the abrasion process”. It
specifies how far we are from a perfectly
It is most often used to establish abrasive properties in materials.
For a complete list of available size and shape parameters, and an introduction to digital imaging theory, use the below downloads:
POWDER DISPERSION METHOD
The sample is fed on to the hopper, either through an adjustable height funnel, or with the addition of an auxiliary dispersion sieve. The hopper vibrates, and the sample travels to the vacuum entry point. Two parallel glass slides provide a laminar flow chamber, so the particles pass by the lens in an oriented fashion.
MOTORIZED FUNNEL HEIGHT
USING DISPERSION SIEVE
FOR COHESIVE SAMPLES
Using a special monochromatic blue backlight (Occhio pioneered research showing that certain wave lengths, enhanced particle definition), minimum particle detection moved from 1 micron (White Light) to 200 nanometers. The light is also collimated, and acts like a caliper
A telecentric lens is also employed, providing the