> 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
