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ConvertAxesToRealSpace v1

Summary

Converts the spectrum and TOF axes to real space values, integrating the data in the process

See Also

ConvertSpectrumAxis, ConvertUnits

Properties

Name

Direction

Type

Default

Description

InputWorkspace

Input

MatrixWorkspace

Mandatory

An input workspace.

OutputWorkspace

Output

Workspace2D

Mandatory

An output workspace.

VerticalAxis

Input

string

y

What will be the vertical axis ? Allowed values: [‘x’, ‘y’, ‘z’, ‘r’, ‘theta’, ‘phi’, ‘2theta’, ‘signed2theta’]

HorizontalAxis

Input

string

2theta

What will be the horizontal axis? Allowed values: [‘x’, ‘y’, ‘z’, ‘r’, ‘theta’, ‘phi’, ‘2theta’, ‘signed2theta’]

NumberVerticalBins

Input

number

100

The number of bins along the vertical axis.

NumberHorizontalBins

Input

number

100

The number of bins along the horizontal axis.

ConvertAxesToRealSpace_LET_y_x.png

LET converted to X and Y

Description

This converts the workspace into a 2D view of real space detector positions based on the detector positions. This is intended for rapid visualization and has been optimized for speed for use in Live data streams. If the data provided has data binned in Time of flight or any other unit this will be integrated into a single value per detector, before converting to the selected detector and rebinning to the new grid. The output grid is based in the maximum and minimum values of the detectors for axes selected, and the number of bins selected. The rebinning is simply based on centre point rebinning, and as such can be prone to moire based artefacts, however it is fast.

As the rebinning approach is simple centre point rebinning then the quality of the final plot is sensitive to the number of bins selected for each axis, too many will cause gaps between the detectors, and too few will cause overlap in certain bins.

ConvertAxesToRealSpace_LET_y_2theta.png

LET in 2Theta and Y

Axes Units

Name

Units

Description

x, y ,z

meters

The absolute position of the detector as defined in the instrument definition.

r

meters

The absolute position of the detector in spherical coordinates, relative to 0,0,0 as defined in the instrument definition.

theta, phi

degrees

2theta

radians

The theta position of the detector relative to sample position and the beam direction. if the sample is at 0,0,0 and the beam direction matches, then this will match theta above.

signed2Theta

radians

Similar to 2theta, but with a sign calculated relative to the instrument reference frame, with the upper quadrants taking the positive value

Usage

Example - ConvertAxesToRealSpace

ws = CreateSampleWorkspace(BankPixelWidth=20)
#move the 2nd bank to a better position
MoveInstrumentComponent(ws,"bank2",X=0.2,Z=-5,RelativePosition=True)

wsOut = ConvertAxesToRealSpace(ws,"y","2theta",20,20)

# Print the result
print("The output workspace has axes of {} with {} bins".format(wsOut.getAxis(1).getUnit().caption(), wsOut.getNumberHistograms()))
print("and {} with {} bins.".format(wsOut.getAxis(0).getUnit().caption(), wsOut.blocksize()))
ConvertAxesToRealSpace_Example.png

Output:

The output workspace has axes of y with 20 bins
and 2theta with 20 bins.

Categories: AlgorithmIndex | Transforms\Units | Transforms\Axes

Source

C++ header: ConvertAxesToRealSpace.h

C++ source: ConvertAxesToRealSpace.cpp