we tried to get the surface profile of the untreated sand sample and bacteria treated sand with biopolymers on the surface of the sample in wet condition. we used 3D OSP for this purpose. we got the surface profile of untreated sand sample but for biopolymer coated sand in wet condition does not give any results. The instrument does not sense the sample. we tried 5 times but no result. what will be the problem? how to get surface profile/ surface rough ness of the wet biopolymer coated sand surface?
Note: 3D OSP instrument is working fine.confirmed.
Dear Velusamy Gobinath,
It is possible that you may use same force value that is near 100 µN for (untreated sand) hard materials and biopolymer coated sand, but for biopolymer coatings (soft materials) you need to set force value between 50-10 µN for the optical surface profiler.
hope it will work.
Hello,
Maybe you have already found a solution. The system that you use works with white light interferometry technique. There is a good article on NPL UK website http://publications.npl.co.uk/
You can download the document for free: The measurement of rough surface topography using coherence scanning interferometry. You will see that this technique either does not work or has decreased accuracy and more artifact when testing more complex surfaces.
White Light Axial Chromatism sensors could work better for your application. It is the best technique for complex angular surfaces.
if you are curious let me know, we could test samples for you.
Best Regards,
Pierre Leroux
Nanovea
I second Pierre's response. An optical profiler with white light interferometry technique could be the right solution for you.
Thanks,
Dev
Optical profilometer works well for a flat and reflecting surface (for white light interferometry or phase shift techniques). If reflection from the surface is poor, the image created will be erroneous. Please check the surface first.
Manish Gupta: You are right for white light interferometry or phase shift techniques. On the contrary, white Light Axial Chromatism actually work well on rough more specular surfaces. Inteferometry will work up to an angle level depending on magnification used. White light Axial Chromatism will work to a higher minimum angle for flat polished surfaces like glass and can go up to close to 85degree angular on highly specular surfaces.
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