Ellipse Model

Applications:

Certain metal powders and polymer powders; some crystals and abrasives; pollen.

Available measures:

• Equivalent Elliptical Area Width
• EEAW is the width of an ellipse equal in area to the original shape, and having an aspect ratio the same as that of the bounding rectangle.
• Equivalent Elliptical Area Length
• EEAL is the length of an ellipse equal in area to the original shape, and having an aspect ratio the same as that of the bounding rectangle.
• Bounding Ellipse Width
• BEW is the width of a minimal-area ellipse that bounds the particle shape.
• Bounding Ellipse Length
• BEL is the length of a minimal-area ellipse that bounds the particle shape.
• Ellipse Aspect Ratio
• EAR is the ratio of EEAL to EEAW and is the same as the bounding rectangle aspect ratio.
• Ellipsicity
• Ellipsicity = (actual shape area) / (bounding ellipse area). This is a measure of how closely the shape conforms to an ellipse.

Images showing EEAL values