SANSAbsoluteScale v1

../_images/SANSAbsoluteScale-v1_dlg.png

SANSAbsoluteScale dialog.

Table of Contents

Summary

Calculate and apply absolute scale correction for SANS data

Properties

Name Direction Type Default Description
InputWorkspace Input MatrixWorkspace Mandatory  
OutputWorkspace Output MatrixWorkspace Mandatory  
Method Input string Value Scaling method - either a simple scaling by value or using a reference data set. Allowed values: [‘Value’, ‘ReferenceData’]
ScalingFactor Input number 1 Scaling factor to use with the Value method
ReferenceDataFilename Input string   Reference data file to compute the scaling factor. Allowed values: [‘xml’, ‘nxs’, ‘nxs.h5’]
BeamstopDiameter Input number 0 Diameter of the beam on the detector, in mm
AttenuatorTransmission Input number 1 Attenuator transmission used in the measurement
ApplySensitivity Input boolean False If True, the sensitivity correction will be applied to the reference data set
ReductionProperties Input string __sans_reduction_properties Property manager name for the reduction
OutputMessage Output string   Output message

Description

Calculate and apply absolute scale correction for SANS data. The method used can either be a simple scaling using the ScalingFactor property, or computing the scaling factor using a reference data set. In this case, the reference data is loaded, normalized and corrected for detector sensitivity. The corrected reference data is then used to compute the scaling factor according to

f = \frac{N_b}{M*T} ( d/L )^2

where N_b is the total count within the distance of a beam diameter of the beam center.

M is the monitor count.

T is the attenuator transmission.

d is the detector pixel width.

L is the sample-detector distance.

The input workspace is then scaled by 1/f.

This algorithm is rarely called directly. It is called by HFIRSANSReduction.

Categories: Algorithms | Workflow\SANS\UsesPropertyManager