Hi RadekGenerally we measure porosity of coating with the help of optical microscope in Industry for coated sample. We used cross-sections images to check at 50X magnification in microscopic evaluation with std. software measurement analysis with the availability reference of coating porosity and structure.
I hope this information will be helpful to your question.
SEM is very much useful for research and development organisation to study in depth of coating structure, matrix, oxide and phase analysis.
Thanks and Regards
Dear Rogerio Thank you so much.
You've described in a very well in brief information.
Yes that's in industry now best method is to check the porosity via OM IA with automatic measurements software in polished sample cross-section image. Thank you 😊