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SANSAbsoluteScale v1

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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: AlgorithmIndex | Workflow\SANS\UsesPropertyManager

Source

Python: SANSAbsoluteScale.py