Technical Issues - FilmStar News 2012

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January 3    Windows 7 Library

A new feature in Windows 7 is the Library which organizes data stored in various file locations including networks. Users may find it useful to add some or all FilmStar data files.

To set this up, right click on Libraries in Windows Explorer and select New.. Library which you can name FilmStar, Winfilm or whatever you prefer. Navigate to the actual FilmStar directory (usually C:\Winfilm but possibly a network location), right click on a subdirectory name and click Include in library.. FilmStar.

Add only directories that you use. You would not, for example, add DesignCache (used by the DESIGN Recorder), Help, or Config. If you never modify INDEX n,k tables, there's no need to add Index. The Library is only a convenience for locating files and does not actually contain any data.

If you find no advantage in using the Library, just delete it. This does not delete any actual files. You can also delete default Libraries like Pictures, Videos, Music, etc.


January 9    Tolerance Envelopes

 
Tolerancing curves help us understand the effects of layer errors. Curves can be generated in the main DESIGN screen as well as in the FSPlot Module (with speed and capacity limitations). This is illustrated in the following with FILM Archive LASER-O.faw.

When examining the above imagine two envelopes, one with all minimum values and the other all maximum values. Using FilmStar BASIC, the envelopes are quickly calculated by program TolerEnvl.bas. If this file is not found in ..\Winfilm\Basic32, run the FilmStar installer. This case corresponds to the previous graph.

Enter error values in Evalulate.. Tolerancing.. Values <Ctrl+N>. The number of iterations (nIter) and random number seed (CalcRandSeed) are specified in TolerEnvl.bas. Since the area between envelopes increases with additional iterations, it is important to use a fixed number of iterations when comparing designs. Use a large enough value (say 10000) so that additional iterations are insignificant. Ultimately the most powerful tolerancing facility is the FilmStar Workbook, but in many cases the simple and fast envelope technique will be quite sufficient.

Need to retain FSPlot results? Click Data..Copy <Shift+F11> to copy curves to the clipboard in Excel format. Can't get this to work? Contact FTG to arrange a Glance session.


January 19    Comparing %R and %T Spectra

 
The Interactor can graphically compare measured and calculated %R or %T spectra. In most cases this is adequate. But sometimes it is useful to compare %R and %T spectra. This can be accomplished by having the FSPlot Module open at the same time as the Interactor (DESIGN 2.61.2245).
  1. Exit the Interactor and import (Spectra…Open/Paste) a spectrum containing both %R and %T.
  2. Click Spectra…Convert Table to ensure the data has the same range as a calculated spectrum.
  3. Open the FSPlot Module and verify that Setup…Plot %T + %R is checked.
  4. Click the Plot button to add the measured spectra.
  5. Activate the Interactor and notice that calculated spectra are automatically displayed.


 
Colors for plots 3 & 4 were changed to light red & blue from default green & magenta. This is accomplished in the Graph Details dialog as shown here.

After examining the graph, we reckoned that measurement techniques needed revision and referred the party to Ron Willey's white paper on measurement accuracy.