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
Probably the temperature fluctuations of the absorption cell is more
significant than that of the lamp itself.
The effects to consider are:
1) The effect of temperature fluctuations of the electronics.
Probably dominated by the short term temperature fluctuations of the
internal crystal oscillator.
2) The effect of temperature fluctuations of the Rubidium lamp and
associated optical filters.
3) The effect of temperature fluctuations on the Rubidium absorption
cell hyperfine transition frequency.
Bruce
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