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FindDetectorsInShape v1

Summary

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

See Also

MaskDetectorsInShape

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 How To Define Geometric Shape 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: AlgorithmIndex | Utility\Instrument

Source

C++ header: FindDetectorsInShape.h

C++ source: FindDetectorsInShape.cpp