[time-nuts] Cheap Rubidium

[J. Forster]

Exactly.

You use the TE device as a fine control element. The fact that it is
thermally bipolar makes loop design a whole lot easier. It is also FAST,
unlike fans and circulating water.

-John

================


>>The problem with cooler chips is ...
>
> The Real Problem seems to be some don't have much practical sense.
> A peltier would work GREAT, (along with many other simple active ways).
> You don't need to make a refrigerator with it.
> You just need to just keep the temperature of what it is attached
> constant.
> One way to do that, is to mount one side of a  peltier to a working unit's
> heat sink
> AND Adjust everything so that the nominal power into the peltier  is near
> ZERO.
> Now it can cool or heat the THING it is attached to just a little to make
> up for the room temp variation.
>
> Then some simple person may ask why bother with the cooling side at all,
> why not make it unipolar and just use the heat side,
> by using a little larger heat sink on the thing or running the nominal
> Temperature a little higher?
>
> ws
>
> *********************
>
> Hi
>
> THe problem with cooler chips is that the heat still has to go somewhere.
> On the "other side" of the device you need to deal with both the original
> 10 or 20 watts plus the heat from the cooler. To move 10 or 20 watts and
> get a significant delta T you need a pretty big cooler chip. Since they
> are low voltage, that gets you right back to lots of current and thus
> magnetic fields.
>
> The idea of putting the cooler a distance from the cell and coupling with
> moving air is still an option though.
>
> Bob
>
>
> On Dec 24, 2009, at 9:28 AM, Steve Rooke wrote:
>
>> I wonder how peltier devices would work for this application. Coupled
>> with a temperature feedback servo they could be used to heat/cool the
>> rubidium. Does anyone know if they have any electromagnetic field
>> issues with them, the ones I have seen seem to be completely enclosed
>> in aluminium which should act as a Faraday cage. They have the
>> potential of providing a large thermal transfer capability compared
>> with passive devices.
>>
>> 73,
>> Steve
>>
>> 2009/12/25 Joe Gwinn <joegwinn at comcast.net>:
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>