[time-nuts] Measuring speed of light or reproducing a metre

Chris Albertson albertson.chris at gmail.com
Mon Jun 24 03:35:57 UTC 2013


I think one classic way to measure the speed of light is to build a
resonant microwave cavity.  Measure the physical dimensions VERY accurately
and then measure the resonant frequency.


On Sun, Jun 23, 2013 at 4:41 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> Pulse -> (fast) LED
> LED -> splitter
> splitter -> 2 (fast) photo diodes
>
> Start with the diodes in the same plane, calibrate out the systematic
> delays. Likely with a deliberate offset (coax cable length).
>
> Move one detector and note the change in time. Distance would be highly
> dependent on how fast your LED is and how fast your detectors are.
>
> Bob
>
> On Jun 23, 2013, at 7:03 PM, Jim Palfreyman <jim77742 at gmail.com> wrote:
>
> > Hi all,
> >
> > With a 3325B, a 5370B, and other time-nut miscellany, what's the quickest
> > way you can come up with to measure the speed of light OR reproduce the
> > metre.
> >
> > I've got some ideas, but I'd like others' thoughts.
> >
> > Jim
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-- 

Chris Albertson
Redondo Beach, California



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