Re: [ATM] A model of the Hindle Sphere test of a convex Hyperboloid

["Jonathan Lavoie" <atm@lavoielactee.net>]

----- Original Message ----- 
From: "James Lerch" <jlerch1@tampabay.rr.com>
To: <atm_free@yahoogroups.com>; "ATM" <atm@atmlist.net>
Sent: Thursday, March 31, 2005 2:14 PM
Subject: [ATM] A model of the Hindle Sphere test of a convex Hyperboloid


> Greetings All,
>
> I've been working on an OSLO model of a Hindle sphere null
> test for a convex hyperboloid (a some day RC Cass, maybe)..
>
> Anyway, If I modeled it correctly, starting with the assumption that all 
> the
> optical properties are known, It would appear that the spacing between the
> concave sphere and the convex hyperboloid are impressively sensitive to a 
> change
> in distance.  If I modeled it correctly, it would appear I have to get the
> spacing between the two mirrors to within +/- 0.01mm (how exactly would I
> accomplish that?)
>

I think if the distance from the convex to the test focus is measured well,
this implyes that distance between mirror surfaces is also good so no need
to bother with that.

Jonathan


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