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

Bob Camp lists at rtty.us
Sun Jun 23 23:41:21 UTC 2013


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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