def test_that_applies_flat_background_correction_only_to_detectors(self):
# Arrange
workspace_name = "monitor_test_workspace"
workspace = self._create_flat_background_test_workspace(workspace_name)
start_tof = "1"
stop_tof = "40"
# Act
output_workspace = apply_flat_background_correction_to_detectors(
workspace, start_tof, stop_tof)
# Assert
# The monitors should not have changed
self._assert_collection_elements_are_equal(output_workspace.dataY(0),
[2., 2., 4., 4.])
self._assert_collection_elements_are_equal(output_workspace.dataY(1),
[2., 2., 4., 4.])
# The detectors should be subtracted by 2. The last value seems to be slightly off
for index in range(2, output_workspace.getNumberHistograms()):
self._assert_collection_elements_are_equal(
output_workspace.dataY(index), [0., 0., 2., 2.1])
# Clean up
DeleteWorkspace(workspace)
def test_that_applies_flat_background_correction_only_to_detectors(self):
# Arrange
workspace_name = "monitor_test_workspace"
workspace = self._create_flat_background_test_workspace(workspace_name)
start_tof = "1"
stop_tof = "40"
# Act
output_workspace = apply_flat_background_correction_to_detectors(workspace, start_tof, stop_tof)
# Assert
# The monitors should not have changed
self._assert_collection_elements_are_equal(output_workspace.dataY(0), [2., 2., 4., 4.])
self._assert_collection_elements_are_equal(output_workspace.dataY(1), [2., 2., 4., 4.])
# The detectors should be subtracted by 2. The last value seems to be slightly off
for index in range(2, output_workspace.getNumberHistograms()):
self._assert_collection_elements_are_equal(output_workspace.dataY(index), [0., 0., 2., 2.1])
# Clean up
DeleteWorkspace(workspace)
def _get_corrected_wavelength_workspace(self, workspace, detector_ids, calculate_transmission_state):
"""
Performs a prompt peak correction, a background correction, converts to wavelength and rebins.
:param workspace: the workspace which is being corrected.
:param detector_ids: a list of relevant detector ids
:param calculate_transmission_state: a SANSStateCalculateTransmission state
:return: a corrected workspace.
"""
# Extract the relevant spectra. These include
# 1. The incident monitor spectrum
# 2. The transmission spectra, be it monitor or ROI based.
# A previous implementation of this code had a comment which suggested
# that we have to exclude unused spectra as the interpolation runs into
# problems if we don't.
extract_name = "ExtractSpectra"
extract_options = {"InputWorkspace": workspace,
"OutputWorkspace": EMPTY_NAME,
"DetectorList": detector_ids}
extract_alg = create_unmanaged_algorithm(extract_name, **extract_options)
extract_alg.execute()
workspace = extract_alg.getProperty("OutputWorkspace").value
# Make sure that we still have spectra in the workspace
if workspace.getNumberHistograms() == 0:
raise RuntimeError("SANSCalculateTransmissionCorrection: The transmission workspace does "
"not seem to have any spectra.")
# ----------------------------------
# Perform the prompt peak correction
# ----------------------------------
prompt_peak_correction_min = calculate_transmission_state.prompt_peak_correction_min
prompt_peak_correction_max = calculate_transmission_state.prompt_peak_correction_max
prompt_peak_correction_enabled = calculate_transmission_state.prompt_peak_correction_enabled
workspace = self._perform_prompt_peak_correction(workspace, prompt_peak_correction_min,
prompt_peak_correction_max, prompt_peak_correction_enabled)
# ---------------------------------------
# Perform the flat background correction
# ---------------------------------------
# The flat background correction has two parts:
# 1. Corrections on monitors
# 2. Corrections on regular detectors
# Monitor flat background correction
workspace_indices_of_monitors = list(get_workspace_indices_for_monitors(workspace))
background_tof_monitor_start = calculate_transmission_state.background_TOF_monitor_start
background_tof_monitor_stop = calculate_transmission_state.background_TOF_monitor_stop
background_tof_general_start = calculate_transmission_state.background_TOF_general_start
background_tof_general_stop = calculate_transmission_state.background_TOF_general_stop
workspace = apply_flat_background_correction_to_monitors(workspace,
workspace_indices_of_monitors,
background_tof_monitor_start,
background_tof_monitor_stop,
background_tof_general_start,
background_tof_general_stop)
# Detector flat background correction
flat_background_correction_start = calculate_transmission_state.background_TOF_roi_start
flat_background_correction_stop = calculate_transmission_state.background_TOF_roi_stop
workspace = apply_flat_background_correction_to_detectors(workspace, flat_background_correction_start,
flat_background_correction_stop)
# ---------------------------------------
# Convert to wavelength and rebin
# ---------------------------------------
# The wavelength setting is reasonably complex.
# 1. Use full wavelength range
# 2. Use standard settings
if calculate_transmission_state.use_full_wavelength_range:
wavelength_low = calculate_transmission_state.wavelength_full_range_low
wavelength_high = calculate_transmission_state.wavelength_full_range_high
else:
wavelength_low = calculate_transmission_state.wavelength_low[0]
wavelength_high = calculate_transmission_state.wavelength_high[0]
wavelength_step = calculate_transmission_state.wavelength_step
rebin_type = calculate_transmission_state.rebin_type
wavelength_step_type = calculate_transmission_state.wavelength_step_type
convert_name = "SANSConvertToWavelengthAndRebin"
convert_options = {"InputWorkspace": workspace,
"WavelengthLow": wavelength_low,
"WavelengthHigh": wavelength_high,
"WavelengthStep": wavelength_step,
"WavelengthStepType": RangeStepType.to_string(wavelength_step_type),
"RebinMode": RebinType.to_string(rebin_type)}
convert_alg = create_unmanaged_algorithm(convert_name, **convert_options)
convert_alg.setPropertyValue("OutputWorkspace", EMPTY_NAME)
convert_alg.setProperty("OutputWorkspace", workspace)
convert_alg.execute()
return convert_alg.getProperty("OutputWorkspace").value
def _get_corrected_wavelength_workspace(self, workspace, detector_ids, calculate_transmission_state):
"""
Performs a prompt peak correction, a background correction, converts to wavelength and rebins.
:param workspace: the workspace which is being corrected.
:param detector_ids: a list of relevant detector ids
:param calculate_transmission_state: a SANSStateCalculateTransmission state
:return: a corrected workspace.
"""
# Extract the relevant spectra. These include
# 1. The incident monitor spectrum
# 2. The transmission spectra, be it monitor or ROI based.
# A previous implementation of this code had a comment which suggested
# that we have to exclude unused spectra as the interpolation runs into
# problems if we don't.
extract_name = "ExtractSpectra"
extract_options = {"InputWorkspace": workspace,
"OutputWorkspace": EMPTY_NAME,
"DetectorList": detector_ids}
extract_alg = create_unmanaged_algorithm(extract_name, **extract_options)
extract_alg.execute()
workspace = extract_alg.getProperty("OutputWorkspace").value
# Make sure that we still have spectra in the workspace
if workspace.getNumberHistograms() == 0:
raise RuntimeError("SANSCalculateTransmissionCorrection: The transmission workspace does "
"not seem to have any spectra.")
# ----------------------------------
# Perform the prompt peak correction
# ----------------------------------
prompt_peak_correction_min = calculate_transmission_state.prompt_peak_correction_min
prompt_peak_correction_max = calculate_transmission_state.prompt_peak_correction_max
prompt_peak_correction_enabled = calculate_transmission_state.prompt_peak_correction_enabled
workspace = self._perform_prompt_peak_correction(workspace, prompt_peak_correction_min,
prompt_peak_correction_max, prompt_peak_correction_enabled)
# ---------------------------------------
# Perform the flat background correction
# ---------------------------------------
# The flat background correction has two parts:
# 1. Corrections on monitors
# 2. Corrections on regular detectors
# Monitor flat background correction
workspace_indices_of_monitors = list(get_workspace_indices_for_monitors(workspace))
background_tof_monitor_start = calculate_transmission_state.background_TOF_monitor_start
background_tof_monitor_stop = calculate_transmission_state.background_TOF_monitor_stop
background_tof_general_start = calculate_transmission_state.background_TOF_general_start
background_tof_general_stop = calculate_transmission_state.background_TOF_general_stop
workspace = apply_flat_background_correction_to_monitors(workspace,
workspace_indices_of_monitors,
background_tof_monitor_start,
background_tof_monitor_stop,
background_tof_general_start,
background_tof_general_stop)
# Detector flat background correction
flat_background_correction_start = calculate_transmission_state.background_TOF_roi_start
flat_background_correction_stop = calculate_transmission_state.background_TOF_roi_stop
workspace = apply_flat_background_correction_to_detectors(workspace, flat_background_correction_start,
flat_background_correction_stop)
# ---------------------------------------
# Convert to wavelength and rebin
# ---------------------------------------
# The wavelength setting is reasonably complex.
# 1. Use full wavelength range
# 2. Use standard settings
if calculate_transmission_state.use_full_wavelength_range:
wavelength_low = calculate_transmission_state.wavelength_full_range_low
wavelength_high = calculate_transmission_state.wavelength_full_range_high
else:
data_type_string = self.getProperty("DataType").value
fit_state = calculate_transmission_state.fit[data_type_string]
wavelength_low = fit_state.wavelength_low if fit_state.wavelength_low\
else calculate_transmission_state.wavelength_low[0]
wavelength_high = fit_state.wavelength_high if fit_state.wavelength_high\
else calculate_transmission_state.wavelength_high[0]
wavelength_step = calculate_transmission_state.wavelength_step
rebin_type = calculate_transmission_state.rebin_type
wavelength_step_type = calculate_transmission_state.wavelength_step_type
convert_name = "SANSConvertToWavelengthAndRebin"
convert_options = {"InputWorkspace": workspace,
"WavelengthLow": wavelength_low,
"WavelengthHigh": wavelength_high,
"WavelengthStep": wavelength_step,
"WavelengthStepType": RangeStepType.to_string(wavelength_step_type),
"RebinMode": RebinType.to_string(rebin_type)}
convert_alg = create_unmanaged_algorithm(convert_name, **convert_options)
convert_alg.setPropertyValue("OutputWorkspace", EMPTY_NAME)
convert_alg.setProperty("OutputWorkspace", workspace)
convert_alg.execute()
return convert_alg.getProperty("OutputWorkspace").value