Date: Mon, 14 Feb 2011 11:14:56
Author: Rueckner, Wolf
Subject: Re: Jello Gradient Index lens modeling the SOFAR sound channel
Content-Type: text/plain; charset="us-ascii"
Paul Titcomb and I made a gelatin version of our GRIN demo back in 1981 and=
it worked remarkably well. BTW, you don't need to add a light scattering =
agent to the water. Even clear gelatin scattered quite well. If you smear=
a thin layer of silicone vacuum grease on the walls of your mold, the gela=
tin releases readily (vacuum grease withstands high temperatures). Making =
a SOFAR channel model will be totally cool. My thinking is that, if you ma=
ke a rectangular plastic container w/o a bottom, you could stretch Saran Wr=
ap across it (secured with rubber bands) and have that be the bottom. When=
the gelatin has set, just peal off the Wrap and put the two containers tog=
ether. Then you wouldn't even have to remove the gelatin from the containe=
rs. -- Wolfgang
On Feb 13, 2011, at 8:37 PM, Paul Doherty wrote:
Hi Tap ers
The Exploratorium Explainers are working with NOAA and want to build an opt=
ical model of the undersea sound channel.
I want to build a jello based gradient index (GRIN) optical pathway that wi=
ll trap a laser beam.
I showed them the one where I layer water (doped with milk) over corn syrup=
(doped with milk) and leave it for a day to allow a gradient to form. But =
they want the gradient at both sides of a channel not just at the top.
I found this site on line but the gradient looks a bit too gentle.
Anyone have ideas about or experience making a stronger gradient?
Or do I just make a very long tube of GRIN jello.
Content-Type: text/html; charset="us-ascii"
cingLightBeam.htmlI found this site on line but the gradient lo=
oks a bit too gentle.http://www.maximizingpr=
nyone have ideas about or experience making a stronger gradient?Or =
do I just make a very long tube of GRIN jello.Paul D=
From email@example.com Mon Feb 14 11:24:22 2011