[time-nuts] Proton Precession Magnetometer

[brent evers]

I've used and repaired EG&G proton maggies in the past.  I can't
remember a lot from them other than that, as you indicated there
wasn't a lot to them.

I think its best to figure out what you need, because putting a proton
maggie in a box may be physically problematic.  If you really think
that's the way to go, you might want to pick up this Geometrics/EG&G
unit on ebay:

ebay item #380328909088

Frankly, I've seen people use a cheap TCM2 magnetic compass fairly
successfully as a magnetometer, but they were mapping cables, etc.

Also, a google of "eg&g magnetometer pdf" will pull up a few documents
that may be of use.

Brent

On Tue, Apr 5, 2011 at 10:36 PM, John Miles <jmiles at pop.net> wrote:
>
>> Hi,
>> I am boxing up my LPRO rubidium source in a steel box. The device is
>> to be thermostated
>> by controlling a small fan outside the box to keep the LPRO at about
>> 40*C.
>> Although the unit is in a mumetal box I assume there may be some
>> penetration of earths magnetic field.
>> The steel box should help that.
>> To test this I want to build a very stable magnetometer. Now I know
>> that all you need is a jar of water or kerosene
>> to give you protons, and a coil around the jar to kick the protons
>> and then listen to them sing.
>> I have also been told that these instruments do not work in a
>> laboratory, as the AC magnetic field
>> drives them crazy.
>> I am thinking of lock in amplifiers and phase locked loops.
>> Also toroidal coil or paired coils.
>> Can anyone in this group point me to an easy to construct and
>> fiercely accurate design to build?
>
> Check out Joe Geller's work ( http://www.gellerlabs.com/index.html ) and
> also Jim Koehler's (
> http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=mag&file=/info/ko
> ehler/index.dat&zoom ).  The May 2007 issue of Circuit Cellar had a shorter
> article by Jim.
>
> -- john, KE5FX
>
>
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