[ATM] A ronchi question
jroyston at gmx.de
Thu Mar 10 20:39:27 JST 2011
There's a program for drawing inverse Ronchi gratings
You need a slow (ISO 25 or 100) high contrast b/w film and a camera -
non-digital cameras have almost died out and the film is only available
from professional photo shops. It's better to develop the film yourself.
I have the equipment, but haven't made such gratings yet - my hobbyhorse
Best wishes, Jerry
> We have always used straight lines on our ronchi testers. What effect, if
> any, would occur if we used lines of a different shape, i.e. curved lines.
> Could a matched set of curved lines be used for a null test on a paraboloid?
> David Davis
> Toledo, OR 97391
> ATM mailing list http://www.atmlist.net/
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