What are Feret diameter, Martin diameter and projection diameter?

Expert Solution

The feret diameter also known as caliper diameter is a measure of an object size along a specified direction.It can be defined as the distance between the two parallel planes restricting the object perpendicular to that direction. This measure is used in the analysis of particle sizes, for example in microscopy, where it is applied to projections of a three-dimensional (3D) object on a 2D plane.

Martin's diameter is a specific method for measuring the diameter of irregular shaped particles,it is the measured distance between opposite sides of a particle, and is measured transverse to the particle on a line that bisects the projected area. Basically, Martin's diameter measures the chord of a particle and is useful for estimating the surface area of an irregular non-spherical particle.

The projection diameter is the diameter of a sphere having the same projected area as the particle. The projection diameter of a particle d can be related to the particle projected area A as

d = square root of (4A/pi)

genius_generous answered 2 years ago

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