Re: NANFA-- Polarization and headlamp questions

BG Granier (shinerscoop_at_bellsouth.net)
Wed, 17 Mar 2004 13:10:39 -0600

Hey, here's a thought! Wear a headlight on your head and use a 5 gallon
bucket with a clear acrylic bottom to view directly under water thereby
avoiding the glare (bounce) from the surface tension of the water...........

Haven't ya'll seen those underwater viewing buskets kinda like the gold
nugget hunters like to use?
----- Original Message -----
From: "Irate Mormon" <archimedes_at_bayspringstel.net>
To: <nanfa_at_aquaria.net>
Sent: Wednesday, March 17, 2004 12:08 PM
Subject: Re: NANFA-- Polarization and headlamp questions

> > > Martin pretty much out lined how polarized glasses work. The one lens
has
> > > "mini blinds" that go vertical in the lens, and the other one has
> > horizontal
> > > ones. In conjuction is how they work well with the eye. Would this
work on
> >
> > a
> > > lens of a light though? I thought the reason it worked as glasses
> > reducing
> > > glare is because each eye is working together.
>
> It is effective with a single lens if you are able to rotate it. That way
you
> can find the optimum polarization angle. Photographic polarization
filters (the
> good ones, anyway) are designed to be rotated for just that reason. So if
you
> had a set of rotating louvers you might get something similar.
>
> On the fiberoptic front, I recall seeing MANY years ago where somebody
took a
> bunch of glass fibers, twisted them, and then fused them into a cylinder.
He
> then took slices of the cylinder. The result was non-distorting glass
discs
> which would make an obect appear upside down (or rotated to whatever
desirable
> degree, according to the twist of the fiber bundle).
>
> Anyway, it seems to me that optical fibers should polarize light to
certain
> extent. The downside of this might be a samll, very conentrated spot of
light
> projecting from the headlamp. That would be useless for collecting.
Maybe I'll
> play with it this summer.

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/ For more information about NANFA, visit our web page, http://www.nanfa.org