FindDetectorsInShape v1

../_images/FindDetectorsInShape-v1_dlg.png

FindDetectorsInShape dialog.

Summary

Used to find which instrument detectors are contained within a user-defined 3-D shape.

Properties

Name Direction Type Default Description
Workspace Input MatrixWorkspace Mandatory Name of the input workspace
ShapeXML Input string Mandatory The XML definition of the shape
IncludeMonitors Input boolean False Whether monitors should be included if they are contained in the shape (default false)
DetectorList Output int list   The list of detector ids included within the shape

Description

The algorithm places the user-defined geometric shape within the virtual instrument and reports back the detector ID of every detector that is contained within it. Detectors are only considered if their central location point is contained within the shape.

There are a variety of shapes available.

Usage

Example - Finding Detectors Using Cylinders

import os

# Load in the MUSR instrument from its IDF file.
inst_def_file = os.path.join(config["instrumentDefinition.directory"], "MUSR_Definition.xml")
musr_inst_ws = LoadEmptyInstrument(inst_def_file)

# Define a cylinder with radius 0.1.
narrow_cylinder = """
    <infinite-cylinder id=\"shape\">
    <centre x=\"0.0\" y=\"0.0\" z=\"0.0\" />
    <axis x=\"0.0\" y=\"0.0\" z=\"1\" />
    <radius val=\"0.1\" />
    </infinite-cylinder>
    <algebra val=\"shape\" />
    """
# Define a wider cylinder with radius 0.2.
wide_cylinder = """
    <infinite-cylinder id=\"shape\">
    <centre x=\"0.0\" y=\"0.0\" z=\"0.0\" />
    <axis x=\"0.0\" y=\"0.0\" z=\"1\" />
    <radius val=\"0.2\" />
    </infinite-cylinder>
    <algebra val=\"shape\" />
    """

no_detectors = FindDetectorsInShape(musr_inst_ws, narrow_cylinder)
all_detectors = FindDetectorsInShape(musr_inst_ws, wide_cylinder)

print "The narrow cylinder contains %i of the detectors." % len(no_detectors)
print "The wide cylinder contains %i of the detectors." % len(all_detectors)

Output:

The narrow cylinder contains 0 of the detectors.
The wide cylinder contains 64 of the detectors.

Categories: Algorithms | Utility\Instrument