Re: [ATM] A more or less new optical test

[Michael Peck <mpeck1@ix.netcom.com>]

At 14:08 10/31/05, Nils Olof Carlin wrote:

>But browsing the text 2-3 times, not too closely, I fail to see what
>you refer to about the geometric treatment of the Foucault test.

Nils,

He talks about integrating a differential equation to get a wavefront 
from its gradient, where the relationship between the wavefront 
gradient and intensity in the shadowgram is derived from geometric 
optics. That's equation 3. Then he does some standard Fourier optics 
calculations and comes up with an equation for the amplitude in the 
shadowgram at equation 11, notes that the (squared modulus of) that 
amplitude doesn't equal the intensity derived in equation 3, and then 
lists three assumptions that need to be made to make them 
approximately equal. Those same three assumptions would apply to the 
Foucault test since the underlying physics and mathematics are the 
same. The only difference is the form of the mathematical description 
of the spatial filter being used.

Mike

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Michael Peck
email mpeck1@ix.netcom.com
Wildlife photoblog! http://wildlife-pix.com
Amateur telescope making http://home.earthlink.net/~mlpeck54/astro/astro.html 

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