[time-nuts] Cheap Rubidium (heatpipe cooling for)

[J. Forster]

That's a significantly bigger one than I got.

-John

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


> See:
> http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product
> <http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product>
>
> located using search term:
> cooler
>
> using the search term
> thermoelectric
> is even better
>
> Bruce
>
> Richard W. Solomon wrote:
>> Can you be a little more specific about the cooler ? Walgreens
>> search function is rather laborious and clumsy.
>>
>> Tnx, Dick, W1KSZ
>>
>>
>> -----Original Message-----
>>
>>> From: "J. Forster"<jfor at quik.com>
>>> Sent: Dec 24, 2009 6:58 PM
>>> To: Discussion of precise time and frequency
>>> measurement<time-nuts at febo.com>
>>> Subject: Re: [time-nuts] Cheap Rubidium (heatpipe cooling for)
>>>
>>> That's why I've been suggesting active control with TE devices.
>>>
>>> You can buy a small TE cooler at Walgreens for about $20. It's big
>>> enough
>>> for a 6-pack of Coke cans and already comes in an insulated box. Add a
>>> simple temperature control in series w/ the DC supply and you should be
>>> well on the way.
>>>
>>> -John
>>>
>>> =================
>>>
>>>
>>>
>>>> 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.
>>>>
>>>> Bob
>>>>
>>>>
>>>> On Dec 24, 2009, at 5:42 PM, Magnus Danielson wrote:
>>>>
>>>>
>>>>> Hal Murray wrote:
>>>>>
>>>>>>> A heat pipe might work if the fluid had a sufficiently low boiling
>>>>>>> point. The rubidium isn't terribly tolerant of high temperatures,
>>>>>>> and
>>>>>>> I'm going to pick up some heat rise as I put it inside some baffles
>>>>>>> /
>>>>>>> shields. You need to find something that fits a fairly narrow
>>>>>>> window.
>>>>>>>
>>>>>> This is all backwards.
>>>>>> The main reason the typical Rubidium box needs a serious heat sink
>>>>>> is
>>>>>> that there is an active heater inside it heating up the lamp to get
>>>>>> it
>>>>>> up to operating temperature.  That part of the system better be
>>>>>> "tolerant" of high (enough) temperature.
>>>>>>
>>>>> ... or a less heat-producing alternative could be used. The
>>>>> Rubidium-lamp produces two wavelengths of which one is filtered by a
>>>>> Rubidium-filter which leaves the final pumping wavelength. This is
>>>>> what
>>>>> a laser diode could supply instead.
>>>>>
>>>>>
>>>>>> Maybe things would be a lot better/simpler if the heating/cooling we
>>>>>> have been discussing were split into two sections.  One for the lamp
>>>>>> assembly, and a second for the electronics.
>>>>>>
>>>>> Most of the discussion has been on thermal isolation of the entier
>>>>> units. Not what needs generates temperature and what requires
>>>>> temperature stability etc.
>>>>>
>>>>>
>>>>>> Anybody know what the thermal coefficient of the lamp is relative to
>>>>>> the electronics?
>>>>>>
>>>>> I am not sure I know what you mean by this...
>>>>>
>>>>> Cheers,
>>>>> Magnus
>>>>>
>>>>> _______________________________________________
>>>>> 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.
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> 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.
>>>>
>>>>
>>>>
>>>
>>>
>>> _______________________________________________
>>> 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.
>>>
>>
>> _______________________________________________
>> 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.
>>
>>
>
>
>
> _______________________________________________
> 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.
>
>