Dear Lena, I'm sorry but I never used it, maybe someone else can answer on this issue... all the best Palma
2012/5/31 Mandl, Magdalena <magdalena.ma...@isc.fraunhofer.de>: > Dear Palma, > > thanks for your help! I have some more questions: > Do you use the PSDF Function to verify the roughness an waviness Parameters? > Do you know if it is possible to determine the Cut-off frequency out of the > PSDF Function? > How can I make out of the vertical PSDF and the horizontal PSDF one PSD > Function? > > All the best > Lena > > -----Ursprüngliche Nachricht----- > Von: Palma D'Antonio [mailto:p.danto...@unifg.it] > Gesendet: Freitag, 25. Mai 2012 15:45 > An: Gwyddion use discussion > Betreff: Re: [Gwyddion-users] roughness parameters > > Dear Lena, I'll try to answer to your questions, even if after having a look > to Petr's works, I'm sure he could do it better... > About value of the cut-off wavelength , times ago I asked the same thing to > Yeti, who patiently explained me that it is equal to 2 Δ / C, where "Δ is > the lateral distance between the neighbour points in the profile (and this > happens to be the same as the pixel size)" and C is the cut-off frequency > value you select on gwyddion. > Filtering the height data in order to obtain a filtered profile on which > calculate the roughness parameters is the usual procedure in surface > metrology, you can find a lot of information on it both in internet or in any > metrology handbook. After the choice of your cut-off value you can visualize > a texture profile (your raw data, which never change selecting the cut-off > values), the waviness profile (that is the profile that is subtracted from > the raw data by the filtering > procedure) and the roughness profile (the result of the filtering procedure > on which the roughnnes parameters are computed). All this profile are still > height data, original or filtered. > I'm sorry, but I never use the 'line thickness', maybe someone else can > answer it. > I've not understand what 'interpolation' you mean... > > I'm quite new in metrology field.. I hope to have been quite precise.. > Palma > > > 2012/5/24 Mandl, Magdalena <magdalena.ma...@isc.fraunhofer.de>: >> Dear Palma, >> >> I´ve red an older input from you and it seems you´ve had kind of the same >> questions. >> I don´t understand the filtering: >> >> So first my data is digitalized with an DFT. How can I imagine that? What >> happens with my data? Before DFT I have a line with measuring points >> equating hights. Then the DFT is done. What do I have then? The graph of the >> texture in the ISO button, is it already with DFT? >> What are the axes in those graphs in the ISO button? >> After the DFT I select a Cut-off frequency. How can I calculate from it the >> cut-off wavelength, which is used in other programs and in the ISO Norm? >> How does the thickness of the measuring line affect the DFT respectively the >> Cut-off frequency? >> With the Cut-off frequency a Gaussian filter is used. How can I imagine >> that? What happens with my data? >> And last but not least: what interpolation should I choose? >> >> -----Ursprüngliche Nachricht----- >> Von: Palma D'Antonio [mailto:p.danto...@unifg.it] >> Gesendet: Donnerstag, 17. Mai 2012 11:29 >> An: Gwyddion use discussion >> Betreff: Re: [Gwyddion-users] roughness parameters >> >> Dear Lena, excuse for my delay in answering, I think that the only way to >> compare different roughness values is to use the same cut-off frequency, >> indeed if the samples are similar they will require the same cut-off... if >> they are so deeply different, maybe it sould not be the case to compare >> them... >> anyway remember that the filtering operation is a selection of the surface >> features you want to characterize and you can roughly control it by looking >> at the variation of the gwyddion roughness profile while changing the >> cut-off value. I have a more accurate method to selct the cut-off value but >> I'm still working on it. >> I hope to have been helpful >> Palma. >> >> 2012/5/9 Mandl, Magdalena <magdalena.ma...@isc.fraunhofer.de>: >>> Dear Palma, >>> >>> thank you for your help! I tried a bit to calculate the roughness with >>> gwyddion and so far it works good. I have one more question: >>> Do I have to select always the same Cut-off to compare the results of >>> different samples? Or do I select one cut-off per sample? Or can I change >>> the cut-off in every line-scan? >>> >>> Best regards >>> Lena >>> >>> -----Ursprüngliche Nachricht----- >>> Von: Palma D'Antonio [mailto:p.danto...@unifg.it] >>> Gesendet: Dienstag, 14. Februar 2012 09:50 >>> An: Gwyddion use discussion >>> Betreff: Re: [Gwyddion-users] roughness parameters >>> >>> Dear Lena and Luis, I'd like to add something about the issue. >>> If I'll wrong about, someone will gently correct me. >>> >>> 1- when you use the 'ISO' button e select a cut-off, Gwyddion automatically >>> filter your data (I think it digitalizes the data, makes a >>> DiscreteFourierTransform and applies a gaussian filter ... or something >>> similar). Larger the cut-off selected more data are filtered. >>> The first two or three cut-off values just correct your data for the main >>> profile shape (plane, circular, etc..). So I don't think you have to do >>> anything before. You can verify it directly, selecting different cut-off >>> values and looking at the 'texture' and 'waviness' profiles, that have been >>> eliminating, and the roughness profile, on which gwyddion compute the >>> roughness parameters. >>> >>> 2- I agree with Luis: it depends on the features size. In order to >>> characterize some surface features you have to be sure to select a scan >>> step suitable to make a good sampling of your object (Nyquist problem). At >>> the same time you have to select a scan area that includes a lot of >>> singular features (that is, it should be 20 or 30 times the linear >>> dimension of the features you are interested to). If your roughness and >>> waviness features have very different sizes, maybe you have to make two >>> different scannings. Those consideration are deeply handled in metrology >>> handbooks. Besides, the size-dependence of your roughness parameters is >>> nearly eliminated through this filtering procedure. >>> >>> I hope to have been helpful, >>> regards >>> Palma. >>> >>> >>> 2012/2/13 luis vazquez <l...@icmm.csic.es>: >>>> 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 >>> >>> >>> >>> -- >>> Palma D'Antonio >>> Laboratorio di Fisica Applicata >>> Dipartimento di scienze biomediche- Facoltà di Medicina e Chirurgia >>> Università degli studi di Foggia >>> email: p.danto...@unifg.it >>> tel. 0881 732086 >>> >>> --------------------------------------------------------------------- >>> - >>> -------- Keep Your Developer Skills Current with LearnDevNow! >>> 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-d2d >>> _______________________________________________ >>> Gwyddion-users mailing list >>> Gwyddion-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/gwyddion-users >>> >>> --------------------------------------------------------------------- >>> - >>> -------- >>> Live Security Virtual Conference >>> Exclusive live event will cover all the ways today's security and >>> threat landscape has changed and how IT managers can respond. >>> Discussions will include endpoint security, mobile security and the >>> latest in malware threats. >>> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >>> _______________________________________________ >>> Gwyddion-users mailing list >>> Gwyddion-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/gwyddion-users >> >> >> >> -- >> Palma D'Antonio >> Laboratorio di Fisica Applicata >> Dipartimento di scienze biomediche- Facoltà di Medicina e Chirurgia >> Università degli studi di Foggia >> email: p.danto...@unifg.it >> tel. 0881 732086 >> >> ---------------------------------------------------------------------- >> -------- >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. >> Discussions will include endpoint security, mobile security and the >> latest in malware threats. >> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >> _______________________________________________ >> Gwyddion-users mailing list >> Gwyddion-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/gwyddion-users >> >> ---------------------------------------------------------------------- >> -------- >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. >> Discussions will include endpoint security, mobile security and the >> latest in malware threats. >> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >> _______________________________________________ >> Gwyddion-users mailing list >> Gwyddion-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/gwyddion-users > > > -- > Palma D'Antonio > Laboratorio di Fisica Applicata > Dipartimento di scienze biomediche- Facoltà di Medicina e Chirurgia > Università degli studi di Foggia > email: p.danto...@unifg.it > tel. 0881 732086 > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and threat > landscape has changed and how IT managers can respond. Discussions will > include endpoint security, mobile security and the latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Gwyddion-users mailing list > Gwyddion-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gwyddion-users > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Gwyddion-users mailing list > Gwyddion-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gwyddion-users -- Palma D'Antonio Laboratorio di Fisica Applicata Dipartimento di scienze biomediche- Facoltà di Medicina e Chirurgia Università degli studi di Foggia email: p.danto...@unifg.it tel. 0881 732086 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Gwyddion-users mailing list Gwyddion-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gwyddion-users
