Proton Precession Magnetometer
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?
cheers, Neville Michie
Whats the required sensitivity? How much field strength (penetration)
are you trying to measure?
Brent
On Tue, Apr 5, 2011 at 9:26 PM, Neville Michie namichie@gmail.com 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?
cheers, Neville Michie
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There's an article in the may 2007 (issue 202) issue of circuit cellar on building a magnetometer that might be a good starting point.
Sent from my Banana jr (tm) Mobile Device
On Apr 5, 2011, at 6:26 PM, Neville Michie namichie@gmail.com 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?
cheers, Neville Michie
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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
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@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
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.