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IR ( non-thermal) is exactly the preferred wavelengths for fibre
communications, and so IF you were using IR LED's and a web camera you
would certainly have a way to bring some pinpoints through a panel and
see them.
Thermal IR is absorbed by glass - it allows a great demo..
IF/when they get the thermal IR "STARS" up on the panel and people can
see them via the FLIR camera, you could bring a thin sheet of glass in
front, and "see" them disappear.. helps make the point that astronomy
uses different wavelengths to see different things, and to see THROUGH
diffrent things. Sometimes seeing what is blocked is the only evidence
we have of whats going on in the spaces of space.
Stuart Kohlhagen
Manager Research and development
Questacon
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Erich Rose
Sent: Friday, 15 October 2010 10:04 AM
To: [log in to unmask]
Subject: Re: hidden IR sources for a FLIR camera
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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Do you want small pin-points or a larger dot? IR laser diodes are cheap
and could give a finer point and because you would only need the lowest
power (fractions of milliwatt?) the heat may be less of an issue. But
either way or whatever you use test it out on the bench with the vinyl
to see what happens. Or maybe a larger IR LED and then use fiber optic
strands to feed the individual points. But I'm not sure how well IR
feeds thru those strands...
Erich Rose
Erich Rose Design
807 The Living End
Austin, TX 78746
512-626-9930; [log in to unmask]
On Oct 14, 2010, at 3:35 PM, Sue Ann Heatherly wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology
> Centers Incorporated, a worldwide network of science museums and
related institutions.
> **********************************************************************
> *******
>
> Hi All,
>
>
> I'm working on a low cost "exhibit" (too strong a word) made of vinyl
> posters that show images of astronomical objects. I want to hide
> small point sources of IR behind the posters so that people could
> detect them with an IR camera. (I work at a radio astronomy
> observatory -- we're trying to draw some analogies to radio astronomy)
>
> Have played with christmas lights (painted black), and they work but
I'm afraid of the heat. Would they damage the vinyl over an 8 hour day?
>
> IR LEDs operate at near IR wavelengths and I doubt they'll show up.
These FLIR thermacams work in the mid IR range.
>
> Any ideas?
>
> **********************************************************************
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