IOR Uncertainty Quantification for PIV/LDV Measurements

[C. C.]

Hello All,
I am running some experiments using Particle Image Velocimetry and Laser Doppler Velocimetry techniques. There is a slight mismatch in the Refractive Index of the fluid and my model (Approximately 5% difference) which is creating some uncertainty in my measurements. I was wondering if anyone has any ideas as to how I would be able to quantify the uncertainty in my calculations knowing that the refractive index of the fluid (n₁) and model (n₂). For simplicity, the model I am using is a spherical shell with the fluid inside. If someone can direct me toward finding a solution, it would be appreciated.

 

[gtoguy97]

Thanks,KiranIt depends on the specific optical setup you are using for your experiment. Generally speaking, the mismatch in refractive index will cause some amount of light scattering, which can affect the accuracy of the measurements. The best way to quantify the uncertainty is to conduct a sensitivity analysis, where you measure the effects of varying the refractive indices in small increments, and then observe the changes in your measurements. This will enable you to understand the magnitude of the uncertainty associated with the variation in refractive index.