I am performing a texture surface analysis of a polished ceramic surface using an optical profiler; amongst the parameters I am measuring is the Sdr. I got values for the Sdr when I analyzed my control samples (only polished) and immediately got Sdr values. However, for the next group of samples, where the surface was treated with an etching agent, I'm not getting any readings for Sdr which is why I'm confused. I tried changing the location of the acquired area from the sample but still the same result!
Any suggestions?
Are you sure there are no missing data points (non measured) in your etched surface ? Sdr is an areal parameters and might not be calculated if you have missing points (not all softwares compensate for this).
Need more details, but basically if the surface has roughness than you need to look for peak to peak, rms, waviness etc.
As Mr. Silber wrote, have a more close look to the initial parameters of your sample. Perhaps its just a filter setting issue. Be aware to know the max roughness values and the corresponding slopes, waviness...
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