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

["James Lerch" <jlerch1@tampabay.rr.com>]

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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