Re: [ATM] Foucault software

[Jim Burrows <burrjaw@earthlink.net>]

At 2007-03-12 16:13 -0400, Jonathan Lavoie wrote:

>I know some foucault software but I try to test a deep curve (D=60mm 
>R=83mm) and no program seem to fulfill my need. My light source at 
>51mm and the knife at 220mm so the program should allow to put the 
>light source not at RoC.Tex and FigureXP don't allow that. Also I 
>will need to enter conic constant other than -1 or 0.
>
>I find only Sixtest that allow to enter user defined light source 
>distance and conic constant. Byt Sixtest seems to have difficulties 
>with such a short RoC. For example if I enter r^2/R values for a 
>long RoC the result is perfect. But if I enter r^2/R values for 80mm 
>RoC it gives 975.5 nm surface error !

All three of these programs find what surface you have, given a set 
of Foucault measurements.  You are essentially trying to do the 
reverse - what should the measurements be for a given surface?  That 
can be extremely messy, particularly for fixed source.  To get the 
equation to be solved, look at Eq. (2.4) in
         http://home.earthlink.net/~burrjaw/atm/atm_math.lwp/atm_math.htm
Just for fun, I'll try to solve the quadratic equation for F to get 
the measurements in Jonathan's senario...

Later alligator,


         -- Jim Burrows
         -- http://home.earthlink.net/~burrjaw
         -- mailto:burrjaw@earthlink.net
         -- Seattle N47.4723 W122.3662 (WGS84)


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