Re: ATM 3-Vane or 4-Vane Spiders

["Jim Miller" <jim@jtmiller.com>]

I was summarizing the article.  They didn't go into the physics but showed
relevant patterns.  You can probably dig it out of a optics book like Born
and Wolfe.

have fun

jtm

----- Original Message -----
From: "David Smith" <areopagus125@yahoo.com>
To: <atm@shore.net>
Sent: Monday, October 08, 2001 12:19 AM
Subject: Re: ATM 3-Vane or 4-Vane Spiders




--- Jim Miller <jim@jtmiller.com> wrote:
> 3. Number of spikes is 2x number of vanes.  In the
> case of a 4 vane
> non-offset spider you get 8 spikes which overlay to
> 4 spikes of double
> intensity and same length.  Offseting blurs the same
> energy across a larger
> pattern of four proportionately reduced intensity
> spikes.

Why?  (referring to the last sentence.)  The spike is
perpendicular to the vane, and if the offset vanes are
parallel to each other, you will still get coinciding
spikes.

    David Smith


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