Can an arbitrary refractive index be used for every powder?
No. Review the material and optical model rather than choosing a value solely to obtain a preferred distribution. Assess sensitivity to justified settings during method development.
Distinguish the refractive index used for the particle from the index of its dispersing medium. The real and imaginary components describe different optical behavior. Document the selected model and material assumptions so that comparing two distributions does not conceal a change in how the light signal was evaluated.
How can optical assumptions be tested?
Reprocess one captured scattering pattern with defensible optical inputs for the particle and the liquid. Compare the resulting fine fraction while keeping the dispersion, detector data and reporting basis fixed. This isolates the effect of the evaluation settings.
Method details to record
| Consideration | What to record |
|---|---|
| Material optics | Particle and medium information |
| Model choice | Optical assumptions and settings |
| Comparison record | Same sample and reporting basis |
What belongs beside a refractive-index value?
Identify the material, medium, wavelength where known, and whether the value represents the real or absorptive component. Record the optical model so a second laboratory can reproduce the calculation.
Explore particle characterization equipment
Review the equipment details and discuss the supported configuration for your sample.