R
R Ward
Guest
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
--
hypothetical physics question only.
--
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G
George Herold
Guest
On Wednesday, October 8, 2014 2:37:02 PM UTC-4, R Ward wrote:
http://en.wikipedia.org/wiki/Fibre_optic_gyroscope
I don't see why not. (how much loss do you get it ~1km of coax?)
George H.
You mean like this?I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
http://en.wikipedia.org/wiki/Fibre_optic_gyroscope
I don't see why not. (how much loss do you get it ~1km of coax?)
George H.
J
John Larkin
Guest
On Wed, 08 Oct 2014 18:37:02 +0000, R Ward
<f6ceedb9c75b52f7fcc0a55cf0cfbf5d_990@example.com> wrote:
Seems like it should work; the physics is the same. The practical
problem is that coax has a lot of attenuation, and a gyro needs a lot
of path length to make a decent signal. Fiber is also pretty good as
regards prop delay vs temperature, way better than the usual coax.
Fiber gyros can also use interferance to detect the rotational
Dopplerish thing, which is awfully sensitive.
The numbers don't look promising for coax.
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
<f6ceedb9c75b52f7fcc0a55cf0cfbf5d_990@example.com> wrote:
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
Seems like it should work; the physics is the same. The practical
problem is that coax has a lot of attenuation, and a gyro needs a lot
of path length to make a decent signal. Fiber is also pretty good as
regards prop delay vs temperature, way better than the usual coax.
Fiber gyros can also use interferance to detect the rotational
Dopplerish thing, which is awfully sensitive.
The numbers don't look promising for coax.
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
J
John Larkin
Guest
On Wed, 8 Oct 2014 12:20:10 -0700 (PDT), George Herold
<gherold@teachspin.com> wrote:
You can think of storing information in a transmission line, in units
of, say, bits per kilometer. Single-mode fiber will beat coax by at
least 3 orders of magnitude, maybe 6.
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
<gherold@teachspin.com> wrote:
On Wednesday, October 8, 2014 2:37:02 PM UTC-4, R Ward wrote:
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
You mean like this?
http://en.wikipedia.org/wiki/Fibre_optic_gyroscope
I don't see why not. (how much loss do you get it ~1km of coax?)
George H.
You can think of storing information in a transmission line, in units
of, say, bits per kilometer. Single-mode fiber will beat coax by at
least 3 orders of magnitude, maybe 6.
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
T
Tim Wescott
Guest
On Wed, 08 Oct 2014 18:37:02 +0000, R Ward wrote:
I think that if you had lots and lots of really low-loss coax, the answer
would be yes. Work out the loss per wavelength for fiber vs. coax, and I
think you'll be disappointed though.
However, if you go to www.hypotheticalphysicssupply.com, they may have
some appropriate coax, in large enough reels to be worthwhile.
--
www.wescottdesign.com
I realize that it would be many orders of magnitude less sensitive. This
is a hypothetical physics question only.
I think that if you had lots and lots of really low-loss coax, the answer
would be yes. Work out the loss per wavelength for fiber vs. coax, and I
think you'll be disappointed though.
However, if you go to www.hypotheticalphysicssupply.com, they may have
some appropriate coax, in large enough reels to be worthwhile.
--
www.wescottdesign.com
H
Helmut Wabnig
Guest
On Wed, 08 Oct 2014 18:37:02 +0000, R Ward
<f6ceedb9c75b52f7fcc0a55cf0cfbf5d_990@example.com> wrote:
Has been done, similar things also happen
http://tinyurl.com/pvfh2jd
(10 seconds of Googling)
w.
<f6ceedb9c75b52f7fcc0a55cf0cfbf5d_990@example.com> wrote:
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
Has been done, similar things also happen
http://tinyurl.com/pvfh2jd
(10 seconds of Googling)
w.
G
George Herold
Guest
On Thursday, October 9, 2014 2:41:46 AM UTC-4, Helmut Wabnig wrote:
http://en.wikipedia.org/wiki/Fizeau_experiment
And not a gyroscope... which needs a large turns x area.
Still it's interesting, it seems to imply that one can detect absolute motion with a dielectric... but I'm probably making a mistake.
George H.
On Wed, 08 Oct 2014 18:37:02 +0000, R Ward
f6ceedb9c75b52f7fcc0a55cf0cfbf5d_990@example.com> wrote:
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
Has been done, similar things also happen
http://tinyurl.com/pvfh2jd
That's interesting Helmut. But I think it is a copy of Fizeau's experiment with moving water.
http://en.wikipedia.org/wiki/Fizeau_experiment
And not a gyroscope... which needs a large turns x area.
Still it's interesting, it seems to imply that one can detect absolute motion with a dielectric... but I'm probably making a mistake.
George H.
(10 seconds of Googling)
w.
J
John Larkin
Guest
On Thu, 09 Oct 2014 08:41:46 +0200, Helmut Wabnig <hwabnig@.- ---
-.dotat> wrote:
That paper sounds bogus to me, especially the part about gravity
waves.
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
-.dotat> wrote:
On Wed, 08 Oct 2014 18:37:02 +0000, R Ward
f6ceedb9c75b52f7fcc0a55cf0cfbf5d_990@example.com> wrote:
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
Has been done, similar things also happen
http://tinyurl.com/pvfh2jd
(10 seconds of Googling)
w.
That paper sounds bogus to me, especially the part about gravity
waves.
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
W
whit3rd
Guest
On Wednesday, October 8, 2014 11:37:02 AM UTC-7, R Ward wrote:
If the electrons were moving without coming into thermal equilibrium with the
wire, it'd be possible. Drift velocities (and phonon scattering) give rise to
Ohm's law, and also cause an electron's momentum to be closely coupled
to the wire it's in. It's a MUCH more random motion than the photons in
a singlemode optical fiber.
So, a storage ring (electrons circulating in vacuum) or a superconductor
(with noninteracting electrons) might be practical. Coaxial wiring, not so much.
And, I'm not sure how one would make up losses. With optical, you
can get laser amplification, which preserves phase: with electrons,
the spin is wrong, there ARE NO AMPLIFIERS that can keep the loop
phase-coherent.
I realize that it would be many orders of magnitude less sensitive. This is a
hypothetical physics question only.
If the electrons were moving without coming into thermal equilibrium with the
wire, it'd be possible. Drift velocities (and phonon scattering) give rise to
Ohm's law, and also cause an electron's momentum to be closely coupled
to the wire it's in. It's a MUCH more random motion than the photons in
a singlemode optical fiber.
So, a storage ring (electrons circulating in vacuum) or a superconductor
(with noninteracting electrons) might be practical. Coaxial wiring, not so much.
And, I'm not sure how one would make up losses. With optical, you
can get laser amplification, which preserves phase: with electrons,
the spin is wrong, there ARE NO AMPLIFIERS that can keep the loop
phase-coherent.