How to measure and characterize particle shape?

Particle shape is referred to as particle shape. At present, particle shape is only measured and studied on the outline of its projection surface, including the outline shape and its roughness.

Commonly used in shape research is the characterization of some special shapes, such as rods, flakes, spheres, etc. For rod-shaped and flake-shaped particles, just measure the length, width and thickness: particles that are close to spherical. The sphericity data is also very important. What can usually be measured is the particles on the projection surface. The sphericity data is also very important. What can usually be measured is the circularity of the projection surface. For example, if the particles have certified reference materials, the circularity is required to reach 95%~98%