Re: Sagnac laser speedometer



Surfer wrote:

On Thu, 01 Oct 2009 22:53:11 -0500, Tom Roberts
<tjroberts137@xxxxxxxxxxxxx> wrote:


In particular, for identical sources and detectors at
each end of a straight fiber, with phase comparators
at each end between the source and detector, SR predicts
no phase variation for either a rotation around the
center or a linear translation in any direction. Neither
need be "slow" for this to hold. Note also that either a
linear acceleration or a rotation around one end is
predicted to give a small signal (a steady displacement
of fringes from their position at rest in an inertial
frame); for any achievable experiment this last is far
too small to observe.

Both Torr&Kolen and Krisher et al did such measurements,
and Cialdea did something quite similar:
http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html


Test of the Isotropy of the One-Way Speed of Light...
Krisher T.P., Maleki L., Lutes G.F., Primas L.E., Logan R.T., Anderson
J.D. and Will C.M.
Phys Rev D, 42, 731-734, 1990.

This was found later to have detected absolute motion. See:
Combining NASA/JPL One-Way Optical-Fiber Light-Speed Data with
Spacecraft Earth-Flyby Doppler-Shift Data to Characterise 3-Space Flow
Reginald T Cahill (Flinders University)
http://arxiv.org/abs/0906.5404

Note Figure 6:

"Data from five different EM speed anisotropy experiments showing
earth rotation effect wrt local preferred frame as shown by sideral
time phasing...."

Also note the claim of having seen gravitational waves. This paper
is an example of extreme sloppiness or dishonesty. Figure 6 shows
his imagination but is that of a crank, not a scientist. If her
had any confidence in his theory, the correct thing to do is to
make a prediction and see if the experiments matched that. All
his does is show some graphs with daily sine waves. Those curves
also represent temperature changes. He has not even looked at
how much temperature change is needed in a 29km fiber to get
an additional delay of 300ps. There was no other attempt to
look at the other experiments. If his theory is correct,
he would calculate his effect and plot it on the experiments
rather than just draw curves he like.

Cahill's experiment suffered from temperature instability. It
would have required temperature uniformity of about .001 degree
to give the results he showed. His work is incompetent. The
other tests he gave were similarly flawed because of temperature
problems. Cahill is being very dishonest in his pursuit of
some imagined glory and that is why the world will continue
to ignore him.



Surfer



.

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