Re: Kilian's Mirror: Poor testing results.
Steve Strickland (lensnut@tpoint.net)
Mon, 17 Apr 1995 02:37:48 -0500
>
>My knife edge and slit are almost 10 Inches apart which I know is WAY
>to far apart, so I think I'll replace the slit, and use a bright LED
>for a light source, and get the slit and edge about 1.5 Inches apart.
>
>Is this causing my blurring?
>
>Anyway, I'll get things rebuilt this week, and I hope to have some more
>news later in the week.
>
I'd say this is a very likely source of error. Try using a slitless tester.
Mine has the light source about 0.125" from the knife edge. Also, the knife
edge stays perfectly aligned.
As far as variation in readings go - have you run a tolerance analysis on
the Foucault test? Try varying little 'r' by a sixteenth of an inch and see
what happens. This may help give you a clue where the variation is coming
from.
LensNut
--
Steve Strickland
Lensnut@tpoint.net