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Re: [ATM] how to use the foucault tester
David,
Jerry Hillman has already given you some good advice on the test stand and
the Foucault article.
What you have sounds like a stationary source Foucault tester, so when you
start using the various testing software, make sure you understand the
difference and choose the settings for stationary rather than moving source.
Once you understand the principles from David HArbour's article, I would
suggest downloading DIFFRACT and use it to simulate what a mirror being
tested looks like. It gives very realistic simulated images of the various
mirror tests.
http://home.earthlink.net/~burrjaw/public/diffract.zip
There are several software programs used for doing the calculations on the
test numbers, FIGUREXP, and TEX were just mentioned on the ATM list within
the last two weeks.
http://lerch.no-ip.com/atm/FigureXP_Ver3.zip
http://home.att.net/~mikel/
All of this software is free, shared by the ATM community.
Kurt
Nixa, MO
At 09:08 AM 10/16/04 -0400, David Williams wrote:
>Hello people
>
>I have a foucault tester that I bought from University Optics called the
>Mirro-Test. And they didn't include any directions except just say that
>you should look in the Tex book. My foucault tester has a little white
>light, light bulb inside a square cross-sectional axis extruded tube, type
>chimney. And this originally had two single edged razor blades with the
>sharp ends facing each other. So I loosened the screws and (I heard from
>a friend of mine that I should use a pinhole test by using a sewing needle
>and just barely poking a hole in a piece of tin foil) I attached this
>piece of tin foil that I had made in advance. That friend's name is Jerry
>Martinsen and he lives in Stergis MI. But the thing is that the light
>source is stable and doesn't move, also there is a micrometer that
>controls how far in and out the knife edge is (not the same as the ones at
>the light), the one that cuts the incoming light to your eye from the mirror.
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