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

[Bob Camp]

Hi

I got the kid a thermo electric wine fridge a while back. It took *days* to pump a half case of wine down from 80F to 50F (yup F not C). 

Some of these gizmos are better than others ....

Bob


On Dec 25, 2009, at 10:32 PM, Bruce Griffiths wrote:

> 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
>>>>> 
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>>>>> 
>>>>>         
>>>> 
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>>>>       
>>> 
>>> 
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> 
> 
> 
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