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Data Reduction and Analysis

last modified 17-09-2010 12:20

Detector response

When you proceed to data reduction, you may need the response of the detector you used:

Data reduction

To make your data processing easier, we provide the essential software tools for data reduction.

SAXS images undergo first a number of necessary corrections (intensity normalization, background subtraction, q-calibration, ...), then an azimuthal integration is performed using program fit2D (see a short presentation below). The data formats currently supported are: BSL, edf, and tiff.
WAXS data are processed using the XOP package in order to correct the geometrical distortion due to detector's position, and to calculate the diffracted intensity via azimuthal integration. XOP supports edf and tiff data formats.

The User's survival manual explains in detail how to use these procedures.

The data reduction programs will be set by your local contact at the beginning of your experiment.

If however you prefer to perform data reduction by yourself, here are a few links that might be useful:

FIT2D	FIT2D is both a general purpose and specialist 1 and 2 dimensional data analysis program, quite popular among ESRF users. It can be used for both interactive and "batch" data processing. Here are some screenshots taken while using FIT2D for data reduction: example of using FIT2D for analyzing CCD data example of using FIT2D for analyzing data obtained with the 2D multiwire gas-filled SAXS detector.
SAXSGUI	This software, currently used on BM26B to acquire SAXS/WAXS data, is also able to perform data pre-processing. Take a look at the manual for details.
ConeX	ConeX is a program for the angular calibration of flat 2D detectors in the context of scattering by isotropic samples, notably of X-rays. The purpose of the software is to average the 2D images recorded by the detector into 1D scattering patterns. Follow the link to get the software package.
BSL	BSL is a 2-D interactive data manipulation package for image data. BSL was based on the OTOKO package sharing the same data format and interface style. This allows data to be reduced to 1-D in BSL and then imported into OTOKO for further processing. The link points to the BSL manual.
OTOKO	OTOKO is a 1-D interactive data manipulation package for (X,Y) data. The link points to the OTOKO manual.

Data analysis

Scatter

We have been involved in the development of the program Scatter that is able to analyse small-angle X-ray (SAXS) and neutron scattering (SANS) curves and patterns of nano- and mesoscopically structured materials such as surfactant, lipid and polymeric micelles and vesicles, lyotropic phases, block copolymers, core/shell-nanoparticles, nanocomposites and mesoporous materials. It in particular can model and fit 2-dimensional scattering patterns and allows the automated, non-interactive analysis of large series of data files.
Follow the link to read more and to get the software package.

Other links

CCP13	CCP13 is the Collaborative Computational Project for fibre diffraction. The project has been refunded to support research fellows working on data extraction from diffraction patterns recorded at x-ray and neutron beam sources. The CCP13 suite has been installed on a variety of platforms running UNIX based operating systems.
canSAS	Collective Action for Nomadic Small-Angle Scatterers