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Subject:
Re: Large Prisms/Diffraction Gradients
From:
Chuck Howarth <[log in to unmask]>
Reply To:
Informal Science Education Network <[log in to unmask]>
Date:
Wed, 29 May 2013 16:11:07 -0700
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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.
*****************************************************************************

You can also use water-filled plexiglas prisms.  These are much larger and much cheaper than glass prisms and create a pretty good spectrum.  Available from Edmunds Scientific among other places.  


On May 29, 2013, at 8:29 AM, Erich Rose wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
> 
> 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]>
>> 
>> 
>> ***********************************************************************
>> 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.
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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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Chuck Howarth, Vice President
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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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