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

[Richard W. Solomon]

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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