Particles

Particles tab is available when Give particles specifications: Optical properties of the medium will be evaluated using MIE theory is activated in Scattering properties.

Particles

You can add , delete or edit a particle.

Note: After selecting the material file, the description from General tab is added to the list of existing particles. Absorption and index of the new particle are read in this file. The absorption and the index can depend on the wavelength. You can click Edit... to view or edit these values. After selecting a material file to define a new particle, the link with the material file of the particle is lost.

Particle Size Distribution

For each selected particle, you can define the particle size distribution using User defined distribution or Log normal distribution.

User Defined Distribution

User defined distribution is a table which gives the density of each particle for each radius of particle.

Log Normal Distribution

Log normal distribution is described as following with S as Standard deviation and r0 as Mean radius.

The Total concentration (Part/mm3) is the integral of the curve displayed and corresponds to the particle density: Number of particles per unit volume.

Note: The total concentration of particles computed may be incorrect depending on the Standard deviation value being set (higher values particularly lead to incorrect results).