Hi I suspect that I will wind up with at least one dead rubidium in the course of all this ...
Bob On Dec 24, 2009, at 10:19 PM, Bruce Griffiths wrote: > If you do that and it is mu metal then you'll have to demagnetise it. > However this is easier than having to anneal it. > If you have a magnetic probe you may be able to test its effectiveness in > shielding against the earth's magnetic field. > This may be one way of checking if a mu metal case needs to be annealed as a > result of rough handling. > > If you have a dead rubidium then magnetising the case isn't an issue. > > Bob Camp wrote: >> Hi >> >> I'd check the case with a magnet, but I'm not real sure that it would not do >> something permanent. >> >> Bob >> >> On Dec 24, 2009, at 9:09 PM, Bruce Griffiths wrote: >> >> >>> Yes, dont start drilling or punching extra holes in the case as some have >>> done, unless you are sure the case isn't mu metal or similar. >>> >>> Optical interrogation of the resonance using lasers would make it much >>> easier to separate the electronics from the absorption cell, it would also >>> allow the rubidium lamp to be dispensed with. >>> However this method can be expensive and it has its own problems to solve. >>> >>> Bruce >>> >>> Bob Camp wrote: >>> >>>> Hi >>>> >>>> I certainly agree that, say potting the circuit board, would be a lot >>>> easier than some of the stuff we have been talking about. >>>> >>>> My main concern about tearing up the unit is impacting the magnetic >>>> shielding. I assume that the outer enclosure forms part of the magnetic >>>> shield (at least that's what the data sheets say ...). >>>> >>>> Bob >>>> >>>> >>>> On Dec 24, 2009, at 7:51 PM, Magnus Danielson wrote: >>>> >>>> >>>> >>>>> Bob Camp wrote: >>>>> >>>>> >>>>>> Hi >>>>>> The original intent was to simply take an existing "cheap" rubidium and >>>>>> do simple things to it. Tearing it into pieces and redesigning parts of >>>>>> it was not anything I originally contemplated. The tight integration of >>>>>> the physics package to the electronics would make this a fairly involved >>>>>> process. >>>>>> >>>>>> >>>>> Well, the main point with that was that while passive temperature >>>>> stability craze have been raving high here, and into more and more >>>>> expensive and elaborate propositions, relative simple changes (not >>>>> without its challenges) would change the equation (amount of heat to cool >>>>> of) quite noticeably. If money was no object, building >>>>> no-compromise/prisoners temperature stabilization scehemes around used >>>>> commercial rubidiums should not be the optimum way to go. Building a >>>>> Rubidum or Cesium fointain would probably be way better use of the money. >>>>> Quite a different project thought. >>>>> >>>>> Maybe we need to get back to doable levels, and also consider what >>>>> changes Rb frequency, why and what can we do to avoid it. >>>>> >>>>> I have been dipping my nose into the literature, to refresh myself on the >>>>> complex interactions. Lamp intensity in itself is a fashinating topic, >>>>> while the filtering cells temperature to intensity dependence is another >>>>> little complex field of its own and that (as I suspected) intensity too >>>>> pulls the frequency. Oh, and after a quick glaze, I found that the >>>>> necessary side-peaks needed for servo of C-field exists for Rb-87, so it >>>>> can be done similar to that of Cesium. >>>>> >>>>> Cheers, >>>>> Magnus >>>>> >>>>> _______________________________________________ >>>>> 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. >>>>> >>>>> >>>>> >>>> _______________________________________________ >>>> 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. >>>> >>>> >>>> >>> >>> >>> _______________________________________________ >>> 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. >>> >>> >> >> _______________________________________________ >> 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. >> >> > > > > _______________________________________________ > 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. > _______________________________________________ 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.
