Le 21/11/2011 09:49, Hal Murray a écrit :
michael.c...@sfr.fr said:
I heard on the BBC the other day that a repeat experiment is planned,
firing neurinos from the US into Canada. The labs were not cited, but I
expect it would be Fermilab to Sudbury Ontario. If this is the case, then
there will still be the problem of not being able to run a parallel fibre
as the Sudbury detectors are also deep underground. ...
I don't think that running a parallel fiber will help much. I see two
problems.
First, fibers don't run in straight lines. Even if you could accurately
survey the pipes in the ground, there is slack in the fiber within the cable
bundle so it doesn't break if somebody pulls on the cable.
Second, the speed of light in fibers isn't known to the required level of
accuracy. (It's probably temperature dependent.)
I was thinking more of using fibre for determining the distance by
another method rather than for comparing the time of flight, and being
better than 18m over 740km would stretch the technology .
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