As indicated last week, some spare time has been spent trying to re-derive a correction for separating sample container scattering from the sample itself. Normally, a simple background subtraction suffices, but for those who want to go the extra mile (and in particular for those working with strongly absorbing sample containers and samples), you need something a bit more fancy. Read more »
For today’s post, I had a few things planned, but haven’t been able to work anything out yet. So I’ll talk a little about these bits and pieces: Upcoming conferences and meetings, some future instrumentation plans, and a little about the Fancy Background Subtraction Read more »
Before I get started, let me just highlight the new small-angle scattering issue of J. Appl. Cryst. which has come out a few days ago. My contribution was unfortunately not accepted (and I haven’t worked much on it since due to rejection depression), but the journal is still very much worth a read!
Now for the main topic of today’s post. Regular readers will know that I have started implementing the “Everything SAXS”-set of data corrections in the Python language. Having worked on it in between other tasks (evident from the commits to the repository), it is now in such a state that it can do enough to do basic correction and reductions, with uncertainty propagation. At the moment, it is not very user-friendly (no GUI, for example), but it is modular and flexible, with an easy syntax. The correction modules are straightforward and easy to read and write, and Pythonistas will be able to dig right in and use it to do the necessary corrections. Here’s the details: Read more »
I feel I need to make a public apology: it turns out that I have been inaccurate in some of my recent papers on the explanation of the estimation of the uncertainties on the intensities (the uncertainties themselves, however, are correct, so I calculated it right but described it wrong). Here’s what happened: Read more »
A great many of the data correction issues in small-angle scattering can be resolved by trading a kidney for a PILATUS detector  (or similar ). These are detectors using a single crystal sensor as detection surface, and have extremely low noise, low distortion, high dynamic range and single photon sensing capabilities. However, as investigated by Gollwitzer and Krumrey (arXiv version here), this type of detector we so adore for its good detection characteristics may need a bit more data adjustment than expected. Read more »
Over the last year or so, I have spent quite some words on the Monte Carlo method for extracting (particle) size distributions from scattering data. However, it may be more illustrative to show a short video of such a fit in action, simultaneously demonstrating the new GUI. Read more »
More about this next week, but Ingo has kindly provided a Windows executable version of one of the latest development builds of the Monte Carlo code (with GUI). While I have not yet had the chance to test it (being on a mac myself), please go ahead and get it from here!
Some of you may have seen the Live Fourier Transform video that was made a while ago. I am happy to tell you that there is now a new, better version out of that program (still rather small and straightforward, though). Read more »
It has been a very quiet four months (since this post) on the Bonse Hart front, as the generator was out of order (yes, again, and again). However, on one of the last days of 2013, something stirred in the lab, unsettled some dust and replaced the broken part. While I am not quite sure if the cause has been fixed or just the symptoms, the end result is that I can run the generator again at (at least) 10% power without things blowing up at me. Read more »