3.9

SANSSolidAngleCorrection v1

../_images/SANSSolidAngleCorrection-v1_dlg.png

SANSSolidAngleCorrection dialog.

Table of Contents

Summary

Performs solid angle correction on SANS 2D data.

Properties

Name Direction Type Default Description
InputWorkspace Input MatrixWorkspace Mandatory  
OutputWorkspace Output MatrixWorkspace Mandatory  
DetectorTubes Input boolean False If true, the algorithm will assume that the detectors are tubes in the Y direction.
DetectorWing Input boolean False If true, the algorithm will assume that the detector is curved around the sample. E.g. BIOSANS Wing detector.
OutputMessage Output string    
ReductionProperties Input string __sans_reduction_properties  

Description

Performs a solid angle correction on all detector pixels. This algorithm is usually called by SANSReduction or HFIRSANSReduction.

The solid angle correction is applied as follows:

I'(x,y)=\frac{I(x,y)}{\cos^3(2\theta)}

\sigma_{I'(x,y)}=\frac{\sigma_{I(x,y)}}{\vert\cos^3(2\theta)\vert}

If DetectorTubes is set to True, the correction is calculated according to a tube geometry. The cosine term above then becomes:

\cos^3(2\theta) \rightarrow \cos^2(2\theta) \cos(\alpha)

where \alpha: is the angle between the sample-to-pixel vector and its projection on the X-Z plane.

Categories: Algorithms | Workflow\SANS\UsesPropertyManager | CorrectionFunctions\InstrumentCorrections