[Laser] Re: Non-imaging optics - again

[Bob Williams]

On Monday 13 January 2003 17:32, you wrote:

> project at the AMASCI website (forgot URL, you'll have to search) for
> collecting IR from the night sky to send to a detector for monitoring cloud
> cover and IR scattering, collector is made from Al foil glued into a
> funnel, some flashlights (used in "reverse" for beam-forming, a` la conical
> horn uwave antennas), and in x-ray telescopes where it is called a "grazing
> incidence" mirror.
> Easy enough to do, so why not try one out??

This is the kind of thing I was talking about with non-imaging optics....

I can't find it on the AMASCI site...but there are lots of nooks and crannies 
to explore there.  If someone finds that particular site, please pass the URL 
on.

It seems to me that cones, while easy, are less than ideal as they 
supposedlly tend to make a line of light.  Wouldn't  a trumpet do better - 
albeit at the cost of more work?

Bob AA1ZC