6.4

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CalculateSampleTransmission v1

../_images/CalculateSampleTransmission-v1_dlg.png

CalculateSampleTransmission dialog.

Summary

Calculates the scattering & transmission for a given sample material and size over a given wavelength range.

Properties

Name Direction Type Default Description
WavelengthRange Input string Mandatory Wavelength range to calculate transmission for.
ChemicalFormula Input string Mandatory Sample chemical formula
DensityType Input string Mass Density Use of Mass density or Number density. Allowed values: [‘Mass Density’, ‘Number Density’]
Density Input number 0.1 Mass density (g/cm^3) or Number density (atoms/Angstrom^3). Default=0.1
Thickness Input number 0.1 Sample thickness (cm). Default=0.1
OutputWorkspace Output MatrixWorkspace Mandatory Outputs the sample transmission over the wavelength range as a function of wavelength.

Description

Calculates the theoretical scattering & transmission for a given sample over a given wavelength range.

The sample chemical formula is input for the SetSampleMaterial algorithm to calculate the cross-sections. The sample mass density/number density & thickness is input to then calculate the percentage scattering & transmission.

A flat plate sample which is perpendicular to the beam is assumed.

Usage

Example - Running CalculateSampleTransmission.

ws = CalculateSampleTransmission(WavelengthRange='2.0, 0.1, 10.0',
                                 ChemicalFormula='H2-O')

print('Transmission: {:.6f}, {:.6f}, {:.6f} ...'.format(*ws.readY(0)[:3]))
print('Scattering: {:.6f}, {:.6f}, {:.6f} ...'.format(*ws.readY(1)[:3]))

Output:

Transmission: 0.945063, 0.945051, 0.945040 ...
Scattering: 0.054697, 0.054697, 0.054697 ...

Example - Running CalculateSampleTransmission with a specified number density and thickness.

ws = CalculateSampleTransmission(WavelengthRange='2.0, 0.1, 10.0',
                                 ChemicalFormula='H2-O',
                                 DensityType='Number Density',
                                 Density=0.2,
                                 Thickness=0.58)

print('Transmission: {:.6f}, {:.6f}, {:.6f} ...'.format(*ws.readY(0)[:3]))
print('Scattering: {:.6f}, {:.6f}, {:.6f} ...'.format(*ws.readY(1)[:3]))

Output:

Transmission: 0.001450, 0.001448, 0.001446 ...
Scattering: 0.998506, 0.998506, 0.998506 ...

Categories: AlgorithmIndex | Sample