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ResNorm v1

ResNorm dialog.

Summary

This algorithm creates a group ‘normalisation’ file by taking a resolution file and fitting it to all the groups in the resolution (vanadium) data file which has the same grouping as the sample data of interest.

Properties

Name	Direction	Type	Default	Description
InputType	Input	string	File	Origin of data input - File (.nxs) or Workspace. Allowed values: [‘File’, ‘Workspace’]
Instrument	Input	string	iris	Instrument. Allowed values: [‘irs’, ‘iris’, ‘osi’, ‘osiris’]
Analyser	Input	string	graphite002	Analyser & reflection. Allowed values: [‘graphite002’, ‘graphite004’]
VanNumber	Input	string	Mandatory	Sample run number
ResInputType	Input	string	File	Origin of res input - File (_res.nxs) or Workspace. Allowed values: [‘File’, ‘Workspace’]
ResNumber	Input	string	Mandatory	Resolution run number
EnergyMin	Input	number	-0.2	Minimum energy for fit. Default=-0.2
EnergyMax	Input	number	0.2	Maximum energy for fit. Default=0.2
VanBinning	Input	number	1	Binning value (integer) for sample. Default=1
Plot	Input	string	None	Plot options. Allowed values: [‘None’, ‘Intensity’, ‘Stretch’, ‘Fit’, ‘All’]
Save	Input	boolean	False	Switch Save result to nxs file Off/On

Description

The routine varies the width of the resolution file to give a ‘stretch factor’ and the area provides an intensity normalisation factor. The fitted parameters are in the group workspace with suffix _ResNorm with additional suffices of Intensity & Stretch. The fitted data are in the workspace ending in _ResNorm_Fit.

This routine was originally part of the MODES package.

Usage

Example - a basic example using ResNorm.

def createSampleWorkspace(name, random=False):
""" Creates a sample workspace with a single lorentzian that looks like IRIS data"""
import os
function = "name=Lorentzian,Amplitude=8,PeakCentre=5,FWHM=0.7"
ws = CreateSampleWorkspace("Histogram", Function="User Defined", UserDefinedFunction=function, XUnit="DeltaE", Random=True, XMin=0, XMax=10, BinWidth=0.01)
ws = CropWorkspace(ws, StartWorkspaceIndex=0, EndWorkspaceIndex=9)
ws = ScaleX(ws, -5, "Add")
ws = ScaleX(ws, 0.1, "Multiply")

#load instrument and instrument parameters
LoadInstrument(ws, InstrumentName='IRIS', RewriteSpectraMap=True)
path = os.path.join(config['instrumentDefinition.directory'], 'IRIS_graphite_002_Parameters.xml')
LoadParameterFile(ws, Filename=path)
ws = RenameWorkspace(ws, OutputWorkspace=name)
return ws

ws = createSampleWorkspace(“irs26173_graphite002_red”, random=True) res = createSampleWorkspace(“irs26173_graphite002_res”)

ResNorm(VanNumber=’26176’,

ResNumber=’26173’, InputType=’Workspace’, ResInputType=’Workspace’, Instrument=’irs’, Analyser=’graphite002’, Plot=’None’, Version=1)

Categories: AlgorithmIndex | Workflow\MIDAS

Source

Python: ResNorm.py