In some article, i have noticed that after calculation of signal-to-noise ratio the authors have specified the surface roughness value which has highest s/n ratio is considered. But when calculating the s/n ratios generally people are taking lower value of surface roughness. Why it is like that ?
Optimum value is considered for lower surface roughness is highest S/N ratio value?
Never listened about any correlation between the surface roughness and signal-to-noise ratio.
If we say about AFM, the surface roughness is a statistical characteristic of the surface relief. You measure a profile (line), and obtain a lot of surface peaks and valleys. The height distribution of them can be described in most cases by a Gaussian. The root mean squared for the distribution of these peaks-valleys is the surface roughness.
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