Re: ATM Apodizing Mask

[David Nicholls <nicholls@u030.aone.net.au>]

I did a search on the S&T archive (apodize, apodizing, apodization) and
found only a passing reference to a book (p94, Dec 1998).

However, in my ancient and now gone collection of S&T that covered
1962-1969, I remeber an article that referred to a mask with a notched
inside edge - I'm going to attempt to attach a GIF image of the idea,
but if it's not allowed on this list, see
http://www.dcnicholls.com/misc/mask.gif

It would be simple to implement as drawn.

Obviously it's not as extensive as the Suiter design and I don't
remember the purpose of the original article.

However, if the notches are sufficiently small, it might be possible to
get some kind of interference effect... I've not even begun to think
through the physics and the idea may be nonsense or irrelevant.

DN

On 10/9/2003 11:25 PM, David Harbour wrote:
> Peter,
> 
> I have seen at least one article about apodizing masks in an old Sky and
> Telescope. But I no longer have my old Sky and Telescope magazines, the
> hundred pounds or so of which almost caused me to tangle my PA-28's landing
> gear in high tension wires because I was taking off on only one magneto on
> one occasion. (Engage brain before flying airplane).
> 
> But somewhere there must be an index to articles in Sky and Telescope, a
> sort of archival directory by subject or topic category. Hope you can find
> that article, I am sure that I saw it and read it, maybe about a hundred
> years ago or so, and in fact, remember how to make a rather effective one.
> But don't trust my memory; surely someone else will have that issue or
> issues and will respond.
> 
> Davey


-- 
____________________________________

David Nicholls
Nicholls Communications
dcn@dcnicholls.com
http://www.dcnicholls.com/
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