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'[TECH] Helmholtz coil manufacturers'
2008\08\05@124129 by Jonathan Hallameyer

picon face
Hello All,
I'm looking to buy a tri-axis helmholtz coil system and having a bit
of difficulty finding manufacturers of such systems with google, The
Ive found a couple, but the majority of the results are technical
papers and links to patent sites. Anyone know of any manufacuturers,
or a better search engine to use? Ive tried globalspec but that
returns nothing at all for "helmholtz"

Thanks,
Jonathan Hallameyer

2008\08\05@130003 by M. Adam Davis

face picon face
A google search

http://www.google.com/search?q=helmholtz+coil+three+axis

Brings up two manufacturers on the first page:

http://www.meda.com/Data_Sheets/hcs01.pdf

http://www.laboratorio.elettrofisico.com/eng/products.asp?famiglia=Instrumentation&sottofamiglia=HELMHOLTZ%20COILS

Looks like the larger fields are custom designs, but perhaps the
smaller fields available in the second link are "off the shelf" items.

-Adam

On 8/5/08, Jonathan Hallameyer <spam_OUTjmhtauTakeThisOuTspamgmail.com> wrote:
> Hello All,
> I'm looking to buy a tri-axis helmholtz coil system and having a bit
> of difficulty finding manufacturers of such systems with google, The
> Ive found a couple, but the majority of the results are technical
> papers and links to patent sites. Anyone know of any manufacuturers,
> or a better search engine to use? Ive tried globalspec but that
> returns nothing at all for "helmholtz"
>
> Thanks,
> Jonathan Hallameyer
> -

2008\08\05@133042 by Jonathan Hallameyer

picon face
The second manufacturer there is one that Ive already emailed for more
information, and the first manufacturer site looks like it hasnt been
updated in a while, but I'll try to contact them.

On Tue, Aug 5, 2008 at 12:59 PM, M. Adam Davis <.....stienmanKILLspamspam@spam@gmail.com> wrote:
{Quote hidden}

>> --

2008\08\05@143724 by M. Adam Davis

face picon face
Well, here are three more manufacturers (the third and fourth show
single axis as cots equipment, but you might be able to work with them
on a triaxial version, or they should be able to direct you to someone
who can do it for you):

www.ets-lindgren.com/page/?i=HelmholtzCoils
http://oersted.com/helmholtz_coils_1.shtml
www.gmw.com/electromagnets/Electromagnet_index.html
http://www.maginst.com/specifications/helmholtz_coils.htm

This person seems to have some experience building and characterizing them:
http://www.chwala.de/hh3eng.html

Depending on your specific needs you might try using a consultant.

This company seems to have some experience in building and
characterizing them as well:
http://www.magnetometer.com/helm.php
though no COTS versions.

Other links of note:
http://www.directindustry.com/prod/stl-systemtechnik/portable-helmholtz-coil-system-28144-99889.html

Interestingly,
http://oersted.com/magnetic_viewing_film.shtml
has magnetic viewing film that looks to be cheap enough for fun and
experimentation... ( -you faintly hear sounds of Adam tucking that
link away for future use- )

Out of curiosity, what's the application?  Why don't you build one
yourself and use a fluxmeter to calibrate it?  A NASA article (
http://www.nasa.gov/offices/oce/llis/0671.html ) gives enough details
on a particular design that you could readily replicate their results
as a starting point.

You could even use a (relatively) cheap three axis magnetometer to add
closed loop feedback to a control system for the coil.
http://www.sparkfun.com/commerce/product_info.php?products_id=244

-Adam

On 8/5/08, Jonathan Hallameyer <.....jmhtauKILLspamspam.....gmail.com> wrote:
{Quote hidden}

2008\08\06@025440 by Forrest W. Christian

flavicon
face
Are you trying to build a time machine?

Sorry, that was my first impression (meaning a "Helmholtz coil" sounds
like the type of weird concoction which would be part of a time machine
- you know right alongside the flux capacitor), and after looking at the
pictures of the gear and reading the datasheet at
http://www.meda.com/Data_Sheets/hcs01.pdf , I'm not 100% convinced that
a Helmholtz coil isn't the key component in either a time machine or
other similar devices.

After all, anything which includes the following description:
-----------
"In the open loop system, fixed currents are passed through the coils to
produce a coarse null in the control volume. The null is trimmed to its
final value under computer control. Precision control currents are added
to the fixed currents to generate accurate and stable uniform fields
within the control volume"
-----------
*has* to be from some science-fiction story.  Especially when the
features include "Three Square Concentric Orthogonal Helmholtz Coils"
and "±200,000 nT Control Field Range."

So on a more serious note, what exactly do you use a Helmholtz coil
for?  In the real world, that is...all of the purposes I could come up
with seem rather esoteric or more easily obtained in another way.

-forrest


Jonathan Hallameyer wrote:
{Quote hidden}

2008\08\06@171349 by Sean Breheny

face picon face
I had to look it up but it looks like it is simply an arrangement of
coils used to generate a very uniform magnetic field in a volume -
probably for science experiments and possibly medical instrumentation.

http://en.wikipedia.org/wiki/Helmholtz_Coils

Sean


On Wed, Aug 6, 2008 at 2:56 AM, Forrest W. Christian <@spam@forrestcKILLspamspamimach.com> wrote:
{Quote hidden}

>

2008\08\06@201038 by Forrest Christian

flavicon
face
That's pretty much what I got from it...  I was just wondering if there
was some non-obvious but useful application not in the realm of
scientific experiments as about the only thing I could figure out was
basically what you came up with - some esoteric science experiments and
perhaps testing certain sensors such as electronic compasses and the
like - although it would seem that most apps I can think of would not
require such a complicated device.

That doesn't change the fact that I love the fact that that when you
read the advertising slicks for real versions of this, they sound like
something which some science fiction writer would have just made up.

-forrest

Sean Breheny wrote:
{Quote hidden}

>> -

2008\08\06@203316 by M. Adam Davis

face picon face
Nasa has used them to remove magnetic fields from objects (ie, a
residual field on a piece of hardware going into space).  You don't
want to go to the red planet and worry about ferrite gunking up your
mechanics or sensors.

You can use the coil to cancel out the Earth's magnetic field, and
then test CRT tubes inside it.

You can test sensitive electronic equipment in a strong varying field
before deploying it to a factory where it'll reside next to a monster
motor winding.

You can construct plasma balls inside it and know they aren't going to
zip around due to external fields (or make them move according to your
needs).

You can place atmoic clocks in them to make sure external fields are
compensated for and don't affect the accuracy of the clock.

You can use it with a very sensistive field detector in a closed loop
to enhance the sensitivity or range of the sensor.

-Adam

On Wed, Aug 6, 2008 at 8:10 PM, Forrest Christian <RemoveMEforrestcTakeThisOuTspamimach.com> wrote:
{Quote hidden}

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