Applying Properties

Blackbody and Graybody Calculations

TracePro computes the radiance to be emitted from the surface source for each waveband defined. The radiance emitted is the integral of the blackbody function between the two boundary wavelengths that define each waveband,

λ2
L = ∫ε(λ)M(λ, T)dλ ,	(4.1)

λ1

where M is the blackbody spectral radiance function, ε is the spectral emissivity, T is temperature, λ is wavelength, and L is the emitted radiance.

Source Spreadsheet

A Spreadsheet style editor is available to view and modify Surface Sources. This editor provides an interface to modify individual sources and allows setting and scaling source data for multiple sources. The editor is opened using the

Define|Source Editor menu.

FIGURE 4.12 - Sources Editor,

Within the editor, changes are made to the Object Name, Surface Name and numeric values by typing new data in the appropriate cell. Source Type and Distribution data cells provide lists of options to select from. Several sources may be modified by selecting cells and pressing the Modify Selection button. An example of multiple source editing follows in the next section.

Scaling the Total Rays for Several Sources

To modify several sources simultaneously:

1.Select one or more source parameters as shown in Figure 4.13. In this example the selection includes the Total Rays for all defined sources.

2.Press Modify Selection to display the Modify Selected Source Parameter dialog which provides an entry for a new parameter value or scale factor. See Figure 4.13.

3.Press Scale to apply a scale factor the selected values, or Set To to change the values to a new value.

4.18	TracePro 5.0 User’s Manual

Surface Source Properties

FIGURE 4.13 - Source Editor Modify Dialog

When Selecting parameter cells, the <Shift> and <Ctrl> keys allow extending the selection in the usual ways. Selections may be made across rows and columns as shown in Figure 4.14.

FIGURE 4.14 - Extended selection in numeric data cells

The source Type and Distribution are altered using a drop down list by pressing the list arrow as shown in Figure 4.15.

TracePro 5.0 User’s Manual

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