Re: Gazeous oxygen magnetic behaviour...


"Uncle Al" <UncleAl0@xxxxxxxxxxxxx> a écrit dans le message de news:491EF11F.A904AD6F@xxxxxxxxxxxxxxxx
Fred_Bartoli wrote:

Hello,

I've a very sensitive experiment in which an air coil is the pickup sensor.
We have an unexplained residual error and after carefully eliminating all
the possible causes, the obvious and less obvious ones, we finally found the
cause was "in" the pickup coil itself. There's no doubt about this now.

Some more experiments led us to one hypothesis where the air oxygen which,
is paramagnetic, interacts with the system and I'm now trying to put some
figures on this hypothesis.

Put it in a plastic bag, purge and inflate with nitrogen or argon.
For contrast, try polarizable carbon dioxide. Pure oxygen should give
you 5X the effect.


Yup, but unfortunately I don't have any of this at hand now. (not a physics lab here).


My pb is that I don't know how to work out magnetic problems with gases and
I don't find much information on web.

I can't say much on the system but our hypothesis has to do with linearity
of the medium (air) and saturation.

Any hint on how to tackle this is welcomed.

If you have an effect that cannot be calculated, remove the effect and
measure the difference, if any - above. If the effect is still there,
look up the "magnetic susceptibility" of oxygen.

Oxygen paramagnetism has been used to make oxygen sensors.


Sure, that's what I've looked at first, before getting here, but I could find almost no usable info.
Plus it seems that oxygen sensors are static, while my system is dynamic and I believe that it has some impact.

--
Thanks,
Fred.

.

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