[ATM] Aligning Ronchi screens

[Hugues.Laroche at ses-astra.com (Hugues.Laroche@ses-astra.com)]

Hi there,

So far I have always used the Ronchi test in a moving source setup.
That is, I have a Ronchi screen large enough to have my eye and
the light source coexist behind it, and there the paralelism is
automatically
ensured.

Now to modify this setup as a fixed source, one needs obviously two
Ronchi screens of the same lpi (not a problem) but also well aligned
(same problem if using a slit instead of another Ronchi screen).

How do you do that alignement? What are the tolerances?
If badly aligned, you might deduce wrongly the mirror is astigmatic, right?

Clear skies,

Hugues




--
DISCLAIMER:
This e-mail contains proprietary information some or all of which may be
legally privileged. It is for the intended recipient only. If an addressing
or transmission error has misdirected this e-mail, please notify the author
by replying to this e-mail. If you are not the intended recipient you must
not use, disclose, distribute, copy, print, or rely on this e-mail.