Redstone™ Optical Spectrum Analyzer Chapter 8: Operation
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Figure 61. Reference Spectrum Calculation Setup Window
This dialog box contains a drop-down menu that allows the user to choose the absorption cross section,
absorption spectrum, or transmission spectrum as the output of the calculation. Please note that if an absorption
or transmission spectrum is desired, the dialog box will prompt the user to enter the optical path length through
the gas of interest; the absorption cross section is independent of the path length.
Loading Traces
Except for line-by-line references which have not yet been converted by the procedure outlined above, reference
spectra can be loaded into the main OSA software window and handled as any other trace. Simply click on the
reference you wish to load in the Reference database dialog box and click “Load as Trace.” This will copy the
reference to an empty trace in the main window.
8.10.2. Reference Fitting
The Reference Fit dialog box is used to assign peaks in an unknown spectrum to peaks from one or more
reference spectra. To open this dialog box, click the “Fit” button in the Reference menu.
When the dialog box initially opens, the References section is displayed, which allows one or more reference
spectra to be included in a fit by checking the “Include” check box. Fits can only be performed on measured
absorbance or transmittance spectra, and references must be in the reference database (see Section 8.10.1)
in order to be selectable.
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