From: "Mike Warne" 
To: "ATM List" ,
        
Reply-To: "Mike Warne" 


Hi James and all,

I am wondering if anyone thinks that displaying the differences between
zones might be useful,

eg zone0 subtracted from zone1 ,  zone1 subtracted from zone2.. etc. (For
both ideal, and the averaged readings)..

For example the mirror I am working on,  the ideal differences between
zones happens to be about .014 or .015 inch for most of my zones..  So with
subtracted zones,  I can see where the slopes between zones are moving too
slow, or too quickly,  and identify which zones are chanaging after a
session, and which are not..

This is a technique that Frank Ward shared with the list a while back..

Does this sound useful to anyone?   I have worked on exactly one mirror, so
if I'm off-base,  don't take me too seriously.

Thanks,
Mike Warne.

| #2 Normalized and averaged knife edge readings (So Zone 1 = 0) | #3 Ideal
Knife edge values
| #4 The difference between the average and ideal knife edge readings. |

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