Maker Pro
Maker Pro

Source for Helmholtz Coils

M

mully

Jan 1, 1970
0
I'm looking for a tri-axial, 1 meter Helmholtz Coil to calibrate a set
of magnetoresistive sensors. I have come this far:

http://www.magnetometer.com/helm3.htm

but have run into potential problems with price and lead time.
I could settle for less than 1 meter. Any solutions?
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that mully <[email protected]>
wrote (in said:
I'm looking for a tri-axial, 1 meter Helmholtz Coil to calibrate a set
of magnetoresistive sensors. I have come this far:

http://www.magnetometer.com/helm3.htm

but have run into potential problems with price and lead time.
I could settle for less than 1 meter. Any solutions?

Why not consider making one? I can supply the basic winding data, if you
want to try.
 
J

John Larkin

Jan 1, 1970
0
I'm looking for a tri-axial, 1 meter Helmholtz Coil to calibrate a set
of magnetoresistive sensors. I have come this far:

http://www.magnetometer.com/helm3.htm

but have run into potential problems with price and lead time.
I could settle for less than 1 meter. Any solutions?

Build one. It's just wire.

John
 
M

mully

Jan 1, 1970
0
Well, that is interesting and then I suppose I would require a
gaussometer and drive circuitry. Unfortunately, the cost in time alone
would likely outweigh the benefit and a high quality/resolution device
is required. This is a commercial venture so often it's best to simply
purchase a tried solution.

I would, however, be interested in receiving your basic winding data,
perhaps as a hobby venture. Shawn
 
T

Tim Shoppa

Jan 1, 1970
0
If you want a set of 1 meter Helmholtz Coils to calibrate
magnetoresistive sensors, then presumably you've determined that you
need a volume of fairly flat magnetic field with dimensions like 10 or
20 or 30 cm on a side.

If you can live with a substantially smaller area of flat field, you
can use a much more compact non-Helmholtz coil setup and a gaussmeter
to do your calibration between the poles. Gaussmeters are rather
common at used test equipment houses and Ebay.

Tim.
 
R

Rene Tschaggelar

Jan 1, 1970
0
mully said:
I'm looking for a tri-axial, 1 meter Helmholtz Coil to calibrate a set
of magnetoresistive sensors. I have come this far:

http://www.magnetometer.com/helm3.htm

but have run into potential problems with price and lead time.
I could settle for less than 1 meter. Any solutions?

Helmholtz coils have a fairly uniform field within a third
of the diameter and a third of the length. They are easy to
calculate and easy to wind yourself.

Rene
 
M

mully

Jan 1, 1970
0
That's valuable information. Thank you.

What is your recommendation for a "more compact non-Helmholtz"
arrangement. Solenoid?
 
R

Richard Webb

Jan 1, 1970
0
A few years ago I built a Helmholtz coil. It wasn't difficult, but the most
expensive and long winded part could well end up being calibration. Do you
have to produce calibration documents for test equipment you use? If you do
then just buy one and let someone else have to deal with the hassle!
 
Top