Re: [ATM] A model of the Hindle Sphere test of a convex Hyperboloid 2

[Kevin Whitefire <chaosopher23@yahoo.com>]

It's almost as if we need to come up with another test
that's as easy and cheap and sensitive as the Focault
test.

Kevin of Eastern Iowa
Seeker of the Darkness

--- James Lerch <jlerch1@tampabay.rr.com> wrote:
> 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?)
> 
> In addition, things get catastrophically worse if by
> chance I don't KNOW the
> exact RoC of my poor Convex optic, nor it's current
> Conic Constant.
> 
> I am starting to come to the conclusion the Hindle
> sphere test may be near
> impossible to implement with quantifiable results,
> however I hope I'm 
> overlooking some rather obvious fact
> in my blissful ignorance.. :)
> 
> Here's a  link to an Oslo Screen shot, as well as
> the Oslo file on my web
> site:
> http://lerch.no-ip.com/atm/Hindle_Null.gif (112KB)
> 
> http://lerch.no-ip.com/atm/Hindle_Null.Len (2KB Oslo
> Len file)
> 
> Just looking for ideas :)
> 
> James
> 
> Take Care,
> James Lerch
> http://lerch.no-ip.com/atm (My telescope
> construction,testing, and coating site)
> 
> "Anything that can happen, will happen" -Stephen
> Pollock from:
> "Particle Physics for Non-Physicists: A Tour of the
> Microcosmos"
> 
> " Press on: nothing in the world can take the place
> of perseverance.
> Talent will not; nothing is more common than
> unsuccessful men with talent.
> Genius will not; unrewarded genius is almost a
> proverb.
> Education will not; the world is full of educated
> derelicts.
> Persistence and determination alone are omnipotent.
> "
>                                                     
>       Calvin Coolidge 
> 
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> 

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