Re: Annular interferogram processing by DFTFringe


George Roberts (Boston)
 

Oh and another issue: RMS error.  You have a simple trick in DFTFringe to convert each zernike wyant value into an RMS error.  Which gives you a quick idea of which Zernike terms are contributing most of the overall RMS error.  However if you use an annular mirror you can't just use that same trick because that trick assumes you may have critical errors in the center of the mirror (which is missing in an annular mirror).  However if you use the annular zernike method I'm guessing the trick of converting wyant wave value into RMS error is identical to the current method you are using.  So that is one small advantage to using the annular zernike's.

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