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qing3000@googlemail.com
science forum beginner
Joined: 18 Jul 2006
Posts: 2
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 Posted: Tue Jul 18, 2006 2:31 pm Post subject:
A simple question?
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I have a simple question to ask here. If I send a short electromagnetic
impulse towards a infinite large thin metal plane, I should get two
reflections, one for the air->metal interface and one for the
metal->air interface. How to calculate the time gap of the two
reflections? It is metal, so it doesn't have dielectric property for
velocity calculation. Any help or pointing appreciated!
Qing |
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Timo Nieminen
science forum Guru Wannabe
Joined: 12 May 2005
Posts: 244
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| Posted: Tue Jul 18, 2006 8:35 pm Post subject:
Re: A simple question?
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On Wed, 18 Jul 2006, qing3000@googlemail.com wrote:
| Quote: | I have a simple question to ask here. If I send a short electromagnetic
impulse towards a infinite large thin metal plane, I should get two
reflections, one for the air->metal interface and one for the
metal->air interface. How to calculate the time gap of the two
reflections?
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Basically the same way you would for any non-perfectly conducting
conductor. "Lossy dielectric" = "conductor".
| Quote: | It is metal, so it doesn't have dielectric property for
velocity calculation.
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Yes it does, if it's a real metal. If you're assuming it's a perfect
electrical conductor, then there won't be a second reflection, it'll be a
perfect mirror and everything will be reflected at the first interface.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html |
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qing3000@googlemail.com
science forum beginner
Joined: 18 Jul 2006
Posts: 2
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| Posted: Wed Jul 19, 2006 4:10 pm Post subject:
Re: A simple question?
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Then how to find out the "permitivity" of a real metal, such as
aluminium? I googled "permitivity reference" but only data lossless
material seem to be available.
Timo A. Nieminen wrote:
| Quote: | On Wed, 18 Jul 2006, qing3000@googlemail.com wrote:
I have a simple question to ask here. If I send a short electromagnetic
impulse towards a infinite large thin metal plane, I should get two
reflections, one for the air->metal interface and one for the
metal->air interface. How to calculate the time gap of the two
reflections?
Basically the same way you would for any non-perfectly conducting
conductor. "Lossy dielectric" = "conductor".
It is metal, so it doesn't have dielectric property for
velocity calculation.
Yes it does, if it's a real metal. If you're assuming it's a perfect
electrical conductor, then there won't be a second reflection, it'll be a
perfect mirror and everything will be reflected at the first interface.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html |
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