[time-nuts] Thunderbolt stability and ambient temperature

Magnus Danielson magnus at rubidium.dyndns.org
Wed Jun 10 16:50:26 EDT 2009


Lux, James P skrev:
> 
> 
> On 6/10/09 1:15 AM, "Magnus Danielson" <magnus at rubidium.dyndns.org> wrote:
>>
>> Nobody having a thermal inductive material around? That would be very
>> usefull to handle temperature shifts.
> 
> Let's see.. If heat flow (watts) is the analog of current (Amps), and delta
> T is the analog of voltage, what would a thermal inductor be... It would
> have to have a delta T that is proportional to the rate of change of heat
> flow.  A tough concept to wrap my early morning before coffee brain around..

You could ask around and see if you don't have one of those lying 
around. Otherwise I am sure your colleagues would find good use for it. 
A thin sheet of it wrapped around the birds would help thermal management.

> BTW There are "thermal batteries" which contain a phase change material,
> like wax, in them, but just like real batteries they're more analogous to a
> capacitor.

For certain temperature ranges a certain dynamic range can be made to 
behave inductive I guess. The tunnel diode springs to mind as a similar 
contradictive thing with its dynamic negative resistance.

> One could  synthesize a thermal inductor with an active device (e.g. A heat
> pump of some sort), just as one can synthesize an inductor with a op amp and
> Rs and Cs (and some externally supplied energy)

Synthesis would certainly be possible, but a pure thermal inductor is 
scarse. :)

Cheers,
Magnus




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