Many different techniques for sizing particles in research and production processes are available. For solid particles, often samples are withdrawn and than analyzed using sieve analysis. These sampling techniques often represent not the full size distribution and they are time and labor-intensive. Especially for technical applications with fast reactions and high volume streams such kind of measurements are not suitable. Therefore other methods, like inline imaging devices are in use, to be used as real time monitoring devices.
Imaging is a 2D analysis of a 3D object and sieving is a 1D analysis of a 3D object. Are we somehow able to universally correlate the two measurements assuming free fall of the irregular shaped particles?
Why do you need a "perfect match" for distribution? as Mr Rawle send you this question is very old and never solved. This is because particle size distribution is only a way to represent your solid or liquid system. Look to your computer, what is the size of it? Assuminge that it is a laptop closed will be easier to answer this question. But there is not only one answer. You may measure it as the largest diagonal or by one of its size or other measurement that you choose to represent it. The same hapens with every particle in the world. for everyone you can adjust two paralel plans in the directions of long height and width. With this,@ ONE PARTICLE is modeled by three dimensions. But you need to represent it , like in the case of your computer, by only one size to create a particle size distribution. And how we choose? The choice arrives from the method you use to measure your particle: screening ( measures normally the second size of the particle) ligth scattering (usually the diameter of a sphere that have the same projected area of the particle) or by imaging (where we choose a direction on the particle to measure it).
This explain why you can compatibilize 2 partilce size measurements on excel but it is not valid for generalization, each method has a characteristic particle size, that represents a tridimensional particle , no matters it's size. the best approach s for spheric particles thar theoretically should give the same size, no matters the measurement technique.
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