Re: Tip for GPS users

In sci.physics, tdp1001@xxxxxxxxx
<tdp1001@xxxxxxxxx>
wrote
on 23 Oct 2006 01:35:22 -0700
<1161592522.189997.134810@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

The Ghost In The Machine wrote:
In sci.physics, tdp1001@xxxxxxxxx
<tdp1001@xxxxxxxxx>
wrote
on 22 Oct 2006 18:40:46 -0700
<1161567646.597207.248950@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

Sam Wormley wrote:

[snip for brevity]


A $30B+ industry, applying relativity to create a global
infrastructure benefiting people all over the world got
your goat, eh Potter (Willy Lowman).

It is interesting to see that Sam Wormley
states that General Relativity is a $30B+ industry.

I knew that billions of the taxpayers, hard-earned dollars
went into trying to rationalize General Relativity,
but I didn't realize that Congress was stupid enough to
waste that much money on a non-cost-effective model
promoted by self-serving charlatans and their dupes.

As I pointed out,
after Newton's model,
there were immediate and rapid advances
in mechanics, astronomy, etc.

After the Faraday/Maxwell model
there were immediate and rapid advances
in chemistry, electricity, etc.

After the Watson/Crick DNA model
there were immediate and rapid advances
in medicine, genetics, animal husbandry,
the history of the Earth and Mankind, etc.

Here we are, 100 years after General Relativity
and it continues to generate more hype and heat
than light and advances, and waste time, money and minds on such
pursuits as time travel, worm holes, space warps, gravity waves, etc.

A mind is a terrible thing to waste.

It is interesting to see that Tom Potter doesn't quite
get it. For starters, SPEAR created the tau lepton using
electrons and positrons. The tau lepton is far too heavy
to explain without invoking either superluminal electrons,
or relativity. Most accelerators pour more energy into
their particles than is required to accelerate them to
Newtonian lightspeed.

Laser gyroscopes are based on the Sagnac effect, an effect
that cannot even work in an absolute-time-compatible
framework.

GPS is routinely used, but the construction thereof
required the satellite clocks to be compensated for
relativistic effects; otherwise the error will be almost
11 km at certain points of the day.

Even the astrologers have to account for relativity, though
probably not by a lot; the discrepancy is approximately 43
arc-seconds per century. Over 10,000 years that translates
into almost 12 degrees.

Whether $30B can be directly attributable to SR, GR, or both,
or not, I for one cannot say. Laser gyroscopes, though, are
good evidence. :-)

It is interesting to see that The Ghost In The Machine asserts
that the "laser ring gyro" is a $30,000,000,000.00 business annually,
and he seems to assert that General Relativity was essential
to the development of the "laser ring gyro".

The former, no. The latter, maybe.


As can be seen from the NASA history article at the URL below,
the "laser ring gyro" evolved from the mechanical gyro,
and as everyone who has heard a train go by knows,
the frequency of the sounds are higher as the train approaches,
and are lower when the train is receding.

This is what is known as the "Doppler Effect",
and as can be seen, from the URL below,
Christian Doppler explained this effect very well in 1842.

http://www.who2.com/christiandoppler.html
Christian Doppler studied mathematics and astronomy in Czechoslovakia
and Austria, and ended up teaching in Vienna. In 1842 he presented his
paper "On the Coloured Light of Double Stars and Certain Other Stars of
the Heavens," illustrating what has since been called the Doppler
Effect. He explained that the perceived change of frequency in light
and sound waves was due to the relative motion of the source and the
observer. His ideas helped pave the way for the idea that the universe
is expanding, and made it possible to follow weather patterns by
tracking electromagnetic radio waves.

http://history.nasa.gov/SP-480/ch14.htm

"In recent years the limitations of mechanical gyros-never so great as
to impair their usefulness over moderate intervals-has been moderated
by an exciting development, the laser ring gyro. In effect these gyros
are made by replacing the rotating mechanical parts with rings of laser
light, rotating without friction. Each laser gyro consists of two rings
of light traveling in opposite directions; motion causes the frequency
of one beam to be upshifted and the other downshifted"

As can be seen, Ghost In The Machine claimed:
"Laser gyroscopes are based on the Sagnac effect.."

As a guy who sold several kinds of accelerometers
back in the 1960's, and attended seminars on the subject,
I can assure the Ghost that people were thinking about optical gyros
long before then,
and as soon as the LASER became available,
that they began actively trying to make optical gyros using LASERs,
and utililyzing the **Doppler Effect**.

I trust that the Ghost will post references that show that the
early optical gyro engineers were thinking in terms of Sagnac,
and General Relativity rather than Doppler.

Well, sorry to disappoint you. A search did cough up some
interesting stuff but all of it is "pay per view".

http://en.wikipedia.org/wiki/Laser_gyroscope

needs to be edited, as it mentions Sagnac and is too brief. I'll leave
that to you.

[.sigsnip]

--
#191, ewill3@xxxxxxxxxxxxx
Linux. Because it's there and it works.
Windows. It's there, but does it work?

--
Posted via a free Usenet account from http://www.teranews.com

.

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