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Date: | Wed, 29 May 2013 10:29:04 -0500 |
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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
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A diffraction grating would work best for capturing a larger beam of light. You can get it in large plastic sheets from folks like Edmunds. But if you are using something like a theater spot you will have to be careful about heat. These new high intensity LED spot lights could be an alternative.
If you want something very specific you could find a holographer and have a custom designed grating created. Holograms are just extremely complicated* diffraction gratings. It would allow you to design for a very specific set of angles and dispersion. You can also record multiple angles and make something that works better as the sun changes positions.
* Not complicated to make, just complicated in density of information recorded.
Erich
Erich Rose Design
807 The Living End
Austin, TX 78746
512-626-9930; [log in to unmask]
http://www.flickr.com/photos/erichrose/
On May 29, 2013, at 10:15 AM, Jeff Rosenblatt <[log in to unmask]> wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> We want to diffract sunlight, or theater/stage white lights, into a nice rainbow pattern on the floor, from about 10-15' height above.
>
> Does anybody know good supply sources for large prisms, or does a special diffraction gradient sheet work as well?
>
> Thanks in advance for any feedback.
>
> --Jeff--
>
> Jeff Rosenblatt
> Director, Science City & Gottlieb Planetarium
> Kansas City's Science Center
>
> Union Station Kansas City, Inc.
> 30 W. Pershing Rd. Suite 400
> Kansas City, MO 64108
> Office: 816-460-2218
> [log in to unmask]<mailto:[log in to unmask]>
>
>
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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit
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