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Radium
science forum Guru Wannabe
Joined: 15 Dec 2005
Posts: 241
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 Posted: Thu Jun 15, 2006 4:39 pm Post subject:
X-rays for telecommunications?
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Hi:
Has the use of x-rays for telecommuncations ever been considered? I
imagine that x-ray photons would have more bandwidth than
visible-spectrum photons. Other than bandwidth, are there any
advantages to using x-rays instead of light. One major disadvantage, is
the fact that x-rays could injure humans and possible some metal
equipments by knocking electrons off the atoms -- one solution to this
would be to use a lower rate of x-rays photons per second so that the
amount of x-ray power does not reach the danger level.
Thanks,
Radium |
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Uncle Al
science forum Guru
Joined: 24 Mar 2005
Posts: 1226
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| Posted: Mon Jun 19, 2006 8:41 pm Post subject:
Re: X-rays for telecommunications?
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Radium wrote:
| Quote: |
Hi:
Has the use of x-rays for telecommuncations ever been considered? I
imagine that x-ray photons would have more bandwidth than
visible-spectrum photons. Other than bandwidth, are there any
advantages to using x-rays instead of light. One major disadvantage, is
the fact that x-rays could injure humans and possible some metal
equipments by knocking electrons off the atoms -- one solution to this
would be to use a lower rate of x-rays photons per second so that the
amount of x-ray power does not reach the danger level.
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How do you propose to FM mix x-rays then heterodyne out the signal?
What is the detectable range of a 1 kilowatt radio transmitter? What
is the propagation range of x-rays through air?
Tell us how 600 grays of x-radiation absorbed makes a difference if
absorbed in a second or 3600 times slower over an hour.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf |
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Igor Khavkine
science forum Guru
Joined: 01 May 2005
Posts: 607
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| Posted: Mon Jun 19, 2006 8:49 pm Post subject:
Re: X-rays for telecommunications?
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Radium wrote:
| Quote: | Hi:
Has the use of x-rays for telecommuncations ever been considered? I
imagine that x-ray photons would have more bandwidth than
visible-spectrum photons. Other than bandwidth, are there any
advantages to using x-rays instead of light. One major disadvantage, is
the fact that x-rays could injure humans and possible some metal
equipments by knocking electrons off the atoms -- one solution to this
would be to use a lower rate of x-rays photons per second so that the
amount of x-ray power does not reach the danger level.
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The problem with X-rays is not their intensity, but rather their
frequency (the same property you are trying to exploit for higher
communication bandwidth). Think of the photoelectric effect. It is very
hard to design optical equipment for x-rays. Because of their short
wavelengths, they see matter made up of individual atoms rather than as
a continuous medium. This completely changes how X-ray optics works
compared to usual geometric and wave optics.
One solution is to use metal mirrors at very low incidance angles. This
idea was used to construct the mirrors of the Chandra X-ray
observatory[1]. However, to be of any use in the communication
industry, one needs to construct X-ray waveguides with small leakage
and absorption losses. I don't know much about this topic, but I'm
pretty sure that the state of the art is still very far from
practicable. The people who worry about X-ray optics are those working
with synchrotron sources and those designing X-ray lasers. You might
want to look these topics up for more information.
Hope this helps.
Igor
[1] http://chandra.harvard.edu/about/ |
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FSC729@yahoo.com
science forum beginner
Joined: 08 Oct 2005
Posts: 2
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| Posted: Thu Jun 22, 2006 6:41 am Post subject:
Re: X-rays for telecommunications?
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X ray communication is a theoretically feasible, but impractical. The
reason why is that X-rays are at such a high frequency that it is
difficult or impossible to find all the engineering equipment to
modulate the X-rays to relay communication. You need power amplifiers,
filters, tuners, matching circuits, and oscillators that all must work
at the X-ray frequencies, and this is for electrons modulated at X-ray
frequencies. Most of this equipment does not exist. If you use photons
to relay the information it is even more difficult, you need to find
lasers, fiber optic material, tuners, etc all that operate at the X-ray
frequenices. There is an X-ray laser but it is quite unweildy.
Eventually I'm sure engineers will develop the equipment necessary to
make X-ray communication possible, but for now it is still in the
development stages.
Best Regards
John G.
Radium wrote:
| Quote: | Hi:
Has the use of x-rays for telecommuncations ever been considered? I
imagine that x-ray photons would have more bandwidth than
visible-spectrum photons. Other than bandwidth, are there any
advantages to using x-rays instead of light. One major disadvantage, is
the fact that x-rays could injure humans and possible some metal
equipments by knocking electrons off the atoms -- one solution to this
would be to use a lower rate of x-rays photons per second so that the
amount of x-ray power does not reach the danger level.
Thanks,
Radium |
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Uncle Al
science forum Guru
Joined: 24 Mar 2005
Posts: 1226
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| Posted: Fri Jun 23, 2006 3:22 am Post subject:
Re: X-rays for telecommunications?
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FSC729@yahoo.com wrote:
| Quote: |
X ray communication is a theoretically feasible, but impractical. The
reason why is that X-rays are at such a high frequency that it is
difficult or impossible to find all the engineering equipment to
modulate the X-rays to relay communication. You need power amplifiers,
filters, tuners, matching circuits, and oscillators that all must work
at the X-ray frequencies, and this is for electrons modulated at X-ray
frequencies. Most of this equipment does not exist. If you use photons
to relay the information it is even more difficult, you need to find
lasers, fiber optic material, tuners, etc all that operate at the X-ray
frequenices. There is an X-ray laser but it is quite unweildy.
Eventually I'm sure engineers will develop the equipment necessary to
make X-ray communication possible, but for now it is still in the
development stages.
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Gee... We could use x-ray communication for lightspeed transmissions
in outer space! Has somebody called the Pentagon? NASA? FEMA?
You are completely out of your depth. "If you use photons to relay
the information it is even more difficult" X-rays are photons. So is
the stuff that tickles your FM radio, gets spurted in Morse code
flashing lights, and makes semaphore possible. Intense collimated
pulsed x-rays are the default output of high energy synchrotron light
sources.
You don't heterodyne detect x-ray communications. You use a
bolometer, fluorescence, or ionization.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf |
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