# [geocentrism] Re: Michelson Interferometer

• From: "Robert Bennett" <robert.bennett@xxxxxxx>
• To: <geocentrism@xxxxxxxxxxxxx>
• Date: Sat, 7 Jul 2007 20:58:07 -0400

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-----Original Message-----
From: geocentrism-bounce@xxxxxxxxxxxxx
[mailto:geocentrism-bounce@xxxxxxxxxxxxx]On Behalf Of philip madsen
Sent: Saturday, July 07, 2007 4:47 PM
To: geocentrism list
Subject: [geocentrism] Michelson Interferometer

Interferometer

Well I did not exactly know what it did, maybe some others were not clear so
I posted it here..  Actually in this set up (which they do not explain too
well using terms like interference which is really a matter of in or out of
phase waves,) and really , "distructive interference"  is simply out of
phase waves.

One more piece of the puzzle I need. Perhaps Neville or Robert, please,

What is the mechanism used, whereby one would expect an "aether medium", to
affect the phase of the light beam by its movement lets say from left to
right in this illustration.
Relative motion of aether and light beam causes delta c, and thus a delta
wavelength.   => Galilean relativity
Click on your link below: Michelson-Morley experiment
<http://en.wikipedia.org/wiki/Michelson-Morley_experiment>
It might help as well to please tell us how thes mirrors could be placed
with such precision in space within the resolution of such a short
wavelengths such as is the light spectrum, to be able to measure even parts
of such wavelengths.
The change in wavelength is measured by counting the interference fringes,
magnified with a scope.
Thanks,

And whilst we are of the experimental mind, could we not use Radar over a
greater distance (than the interferometer) for better  resolution?
No ? light has smaller wavelengths
Philip.

Michelson Interferometer
Main article: Michelson interferometer
<http://en.wikipedia.org/wiki/Michelson_interferometer>
A Michelson interferometer.
<http://en.wikipedia.org/wiki/Image:Interferometer.svg>
<http://en.wikipedia.org/wiki/Image:Interferometer.svg>
A Michelson interferometer.
A very common example of an interferometer is the Michelson
<http://en.wikipedia.org/wiki/Michelson_interferometer>  (or
Michelson-Morley) type. Here the basic building blocks are a monochromatic
source (emitting light or matter waves), a detector, two mirrors and one
semitransparent mirror <http://en.wikipedia.org/wiki/Mirror>  (often called
beam splitter). These are put together as shown in the figure.
There are two paths from the (light) source to the detector. One reflects
off the semi-transparent mirror <http://en.wikipedia.org/wiki/Beam_splitter>
, goes to the top mirror and then reflects
<http://en.wikipedia.org/wiki/Reflection_%28physics%29>  back, goes through
the semi-transparent mirror, to the detector. The other one goes through the
semi-transparent mirror, to the mirror on the right, reflects back to the
semi-transparent mirror, then reflects from the semi-transparent mirror into
the detector.
If these two paths differ by a whole number (including 0) of wavelengths
<http://en.wikipedia.org/wiki/Wavelength> , there is constructive
interference <http://en.wikipedia.org/wiki/Interference>  and a strong
signal at the detector. If they differ by a whole number and a half
wavelengths (e.g., 0.5, 1.5, 2.5 ...) there is destructive interference and
a weak signal. This might appear at first sight to violate conservation of
energy. However energy is conserved, because there is a re-distribution of
energy at the detector in which the energy at the destructive sites are
re-distributed to the constructive sites. The effect of the interference is
to alter the share of the reflected light which heads for the detector and
the remainder which heads back in the direction of the source.
The interferometer setup shown to the right was used in the famous
Michelson-Morley experiment
<http://en.wikipedia.org/wiki/Michelson-Morley_experiment>  that provided
evidence for special relativity
<http://en.wikipedia.org/wiki/Special_relativity> . In Michelson
<http://en.wikipedia.org/wiki/Albert_Abraham_Michelson> 's day, the
interference pattern was obtained by using a gas discharge lamp, a filter,
and a thin slot or pinhole. In one version of the Michelson- Morley
<http://en.wikipedia.org/wiki/Edward_Morley>  experiment, they even ran the
interferometer off starlight. Starlight is temporally incoherent light
<http://en.wikipedia.org/wiki/Coherence_%28physics%29> , but since for small
instruments it can be considered as a point source
<http://en.wikipedia.org/wiki/Point_source>  of light it is spatially
coherent and will produce an interference pattern. The Michelson
interferometer <http://en.wikipedia.org/wiki/Michelson_interferometer>
finds use not only in these experiments but also for other purposes, e.g.,
in astronomical interferometers
<http://en.wikipedia.org/wiki/Astronomical_interferometer>  (see
astronomical section
<http://en.wikipedia.org/wiki/Interferometry#Astronomical_optical_interferom
etry>  below) and gravitational wave
<http://en.wikipedia.org/wiki/Gravitational_radiation>  detectors.
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