Dear Lena, I am a Gwyddion and AFM user, I will try to answer as far as I know:
> >1. I read: to calculate the rougness and >waviness data I need to filter the AFM-Data >first. So my question: In gwyddion when I use >the roughness parameters application, do I first >have to filter the data, or does gwyddion filter >the data automatically in this application? I think you should first filter (whatever: plane fit, flatten, etc) the image and then calculate the roughness data (for instance if you do not correct the plane, the image may have very different roughness values) >2. Does it make sense, to calculate the >roughness in smaller areas of the sample, and >the waviness in a greater areas? Because of the >different structural size which matters. I >thought about that, because I realized that when >I change the thickness of the Scan line the >roughness value drops with expanded lines, the >waviness as well. So how should I use the >application of the roughness parameters to describe my topographies best? From my point of view, the roughness does depend on the area sampled compared to the typical wavelength (or lateral extension) of the surface features. If you have a characteristic surface feature with an average size of L, once your scan size is larger (2 or 3 times, for instance) than L your roughness should more or less saturate (there are papers on this issue). Perhaps the roughness could drop as you see because your scan size is so large that you do not have enough resolution to image properly each characteristic surface feature. Regarding waviness I do not work with this parameter, so I cannot tell you. >3. I have a glass substrate covered. But >the coating doesn´t cover the glass everywhere. >Has gwyddion any way to calculate the coverage factor? I think Philipp has answered this question already. regards, Luis > >Thanks Lena > >------------------------------------------------------------------------------ >Try before you buy = See our experts in action! >The most comprehensive online learning library for Microsoft developers >is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, >Metro Style Apps, more. Free future releases when you subscribe now! >http://p.sf.net/sfu/learndevnow-dev2 >_______________________________________________ >Gwyddion-users mailing list >Gwyddion-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/gwyddion-users ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Gwyddion-users mailing list Gwyddion-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gwyddion-users
