3.6

ApplyCalibration v1

../_images/ApplyCalibration-v1_dlg.png

ApplyCalibration dialog.

Summary

Update detector positions from input table workspace.

Properties

Name Direction Type Default Description
Workspace InOut MatrixWorkspace Mandatory The name of the input workspace to apply the calibration to
PositionTable Input TableWorkspace Mandatory The name of the table workspace containing the new positions of detectors

Description

Update detector positions from input table workspace. The positions are updated as absolute positions and so this update can be repeated.

The PositionTable must have columns Detector ID and Detector Position. The entries of the Detector ID column are integer referring to the Detector ID and the enties of the Detector Position are V3Ds referring to the position of the detector whose ID is in same row.

This algorithm is not appropriate for rectangular detectors and won’t move them.

Usage

Example - move three detectors to specified positions that would be got from calibration

Note

To run these usage examples please first download the usage data, and add these to your path. In MantidPlot this is done using Manage User Directories.

from mantid.kernel import V3D
# Create Workspace with instrument
# We use HRP workspace, which has detectors that are not rectangular.
ws = Load("HRP39180.RAW")

spectra = [0, 1, 3] # Spectra of detectors to be moved

# Show positions before calibration
for i in spectra:
     det = ws.getDetector(i)
     print "Position of Detector ID=%i before ApplyCalibration: %.0f,%.0f,%.0f" % (det.getID(),
             det.getPos().X(), det.getPos().Y(), det.getPos().Z())


# Create PositionTable - This would be done by the calibration functions
calibTable = CreateEmptyTableWorkspace(OutputWorkspace="CalibTable")
# Add required columns
calibTable.addColumn(type="int",name="Detector ID")
calibTable.addColumn(type="V3D",name="Detector Position")
# Populate the columns for three detectors
detIDList = [ ws.getDetector(spectra[0]).getID(), ws.getDetector(spectra[1]).getID(), ws.getDetector(spectra[2]).getID() ]
detPosList = [ V3D(9.0,0.0,0.0), V3D(10.0,3.0,0.0), V3D(12.0,3.0,6.0)]
for j in range(len(detIDList)):
     nextRow = {'Detector ID': detIDList[j], 'Detector Position': detPosList[j] }
     calibTable.addRow ( nextRow )


# Apply Calibration to Workspace
ApplyCalibration ( Workspace=ws, PositionTable=calibTable)

# Show positions after calibration
for i in spectra:
     det = ws.getDetector(i)
     print "Position of Detector ID=%i after ApplyCalibration: %.0f,%.0f,%.0f" % (det.getID(),
             det.getPos().X(), det.getPos().Y(), det.getPos().Z())

Output:

Position of Detector ID=1100 before ApplyCalibration: 0,0,-1
Position of Detector ID=1101 before ApplyCalibration: 0,0,-1
Position of Detector ID=1103 before ApplyCalibration: 0,0,-1
Position of Detector ID=1100 after ApplyCalibration: 9,0,0
Position of Detector ID=1101 after ApplyCalibration: 10,3,0
Position of Detector ID=1103 after ApplyCalibration: 12,3,6

Categories: Algorithms | DataHandling\Instrument