From: "Rich Ball" 
To: 
Reply-To: "Rich Ball" 


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Help!

I am testing the figure on my 8" mirror which has a radius of
curvature = of 99.5 inches.  I am using my homemade Foucault tester which
has a = fixed light source.

If there is a soul out there who could critique my math I'd be much = beholden.

I am working with 5 zones, perhaps overkill.  And the spacing I =
calculated for a Couder mask (A) and the ideal deviations between zones =
(B) are as follows:

       Zone ctr deviation=20
       radius fr C of C=20
           (A)     (B)=20
     Zone 1   1.264   0.008=20
     Zone 2   2.192   0.024=20
     Zone 3   2.828   0.040=20
     Zone 4   3.348   0.056=20
     Zone 5   3.780   0.072=20


Does this look right?  I seem to have some paraboloid figure to begin =
with.  But this stuff is very hard for this neophyte.

Thank you.
Rich Ball

PS.  Thank you to the kind soul who told me about David Harbour's fine =
article on Foucault testing.  I recommend it to any  neophyte at =
www.atm.org/contrib/Harbour/Foucault.html



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Help!
 
I am testing the figure on my
8" mirror which =
has a=20
radius of curvature of 99.5 inches.  I am using my homemade =
Foucault tester=20
which has a fixed light source.
 
If there is a soul out there who could =
critique my math=20
I'd be much beholden.
 
I am working with 5 zones, perhaps =
overkill.  And=20
the spacing I calculated for a Couder mask (A) and the ideal = deviations=20
between zones (B) are as follows:
 


    

  
  
  
  
  
  
    
 
    
Zone=20
    ctr
    
deviation
  
    
    
 
    
radius
    
fr C of
C
  
    
    
 
    
   
(A)
    
   
(B)
  
    
    
Zone 1
    
 =20
    1.264
    
 =20
      0.008
  
    
    
Zone 2
    
 =20
      2.192
    
 =20
      0.024
  
    
    
Zone 3
    
  2.828
    
 =20
      0.040
  
    
    
Zone 4
    
 =20
      3.348
    
 =20
      0.056
  
    
    
Zone 5
    
  =
3.780
    
 =20
     
0.072
 
Does this look right?  I
seem to have =
some=20
paraboloid figure to begin with.  But this stuff is very hard for = this=20
neophyte.
 
Thank you.
Rich Ball
 
PS.  Thank you to the kind
soul who told =
me about=20
David Harbour's fine article on Foucault testing.  I recommend it = to=20
any  neophyte at www.atm.org/con=">http://www.atm.org/contrib/Harbour/Foucault.html">www.atm.org/con=
trib/Harbour/Foucault.html
 
 
 

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