Technical Issues - Diabatic Transmittance Scale

The Schott diabatic transmittance scale [1-log(log(1/t))] displays passbands and blocking regions on the same graph. This scale was implemented in the FSPlot Module in DESIGN 2.61.1040 and MEASURE as well as the Interactor in DESIGN 2.61.1050. There is a choice of (0-1) or (0-100%) ranges.

Assuming that the vertical axis is transmittance, click Transmittance Format in the FSPlot Setup menu to select linear or diabatic formats. Annotations are added in the usual way, and automatic annotations as shown below are supported. Annotations developed for the 0-100% linear scale will work on the 0-100% diabatic scale.

Although FSPlot can also display %T and optical density on the same graph, the diabatic scale has the clear advantage when displaying bandwidth in the blocking zone. It should be mentioned that the usual definition of diabatic is different from Schott's (and FilmStar's) definition.

Users anxious to try this example will find FnumDiabatic.faw and BandWidthPlotII.bas in diabatic.zip. As usual, copy *.faw to c:\Winfilm\Designs and *.bas to c:\Winfilm\Basic32.
 

DESIGN Interactor Options were updated in 2.61.4684 (Dec 2021). The Trns Format option is available when Transmittance (%) is selected. The Diabatic %T Fix range is 10^-8 to ~97.5. Try Auto scaling as well as Setup...Zoom Mode <F5>.

DESIGN/MEASURE/Scantraq Plot Module Setup...Transmittance Format...Diabatic Auto Scale specifies a range computed from plotted data. Also try View...Zoom Mode <Ctrl+Z>. Options were updated in 2.61.4684 (Dec 2021). The Trns Format option is only available when Transmittance (%) is selected. Try Setup...Zoom Mode <F5>