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Thread: Magnetic field viewing film - bistable, high resolution
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On Tue, 5 Aug 2008, M. Adam Davis wrote:
> I thought a lot of you would get a kick out of this:
>
> http://oersted.com/magnetic_viewing_film.shtml
>
> Relatively inexpensive - 1 square foot is $40.  A 3"x3" patch is
> $4.50.  I could see using this as poor man's e-paper - perhaps making
> a high resolution line solenoid array, drawing the 'paper' through,
> and using it until it needs new information.

It would be tricky.  The stuff only really tracks changes between a field
pointed at the paper, and a field paralell to it.  YOu can see this in a
photo from my site...

http://www.ian.org/Magnetics/SeventyTwo14INSqB.jpg

The magnets are set up in an alternating north-south pattern, but you can
see that the squares all look the same as the paper does not show the
difference between north and south magnetic fields.

I think the biggest difficulty would be generating an intense, but very
localized field, or else you erase the pattern you had drawn as you move
down to draw the next line.

But it's cool stuff!

--
Ian Smith
http://www.ian.org
<Pine.LNX.4.64.0808051459540.9847@www.sportsmogul.com> 7bit

In reply to: <bc7a59a0808051146o371df984t7b725e7602db8e52@mail.gmail.com>
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Subject (change) Magnetic field viewing film - bistable, high resolution

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