[time-nuts] quartz / liquid nitrogen

[djl]

Tom: I sense a nice experiment!  Dry ice temps can be attained with 
modest Dewars and thermoelectric fridge devices. PID controller and 
bob's your uncle.  Type K thermocouple modules on epay.   With that 
apparat, a nice set of adev vs temperature possible?  Dry ice/acetone or 
ethyl alcohol (everclear) slurry is often used as a calibration point 
BTW. Liquid N2 may be too cold, or is it He I'm thinking of???
Don
On 2018-04-02 13:46, Tom Van Baak wrote:
> Has anyone tried running a quartz oscillator at liquid nitrogen
> temperatures: -196 C (-321F, 77K)? It's probably impractical
> commercially, but maybe something of value to a time nut. Would that
> dramatically lower temperature improve phase noise & short-term
> performance? Is there a crystal cut that could be optimized for 77 K
> instead of ~25 C (room) or 60 C (oven)?
> 
> If not Nitrogen, how about dry ice (-109F -78C)?
> 
> /tvb
> 
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-- 
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304