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Author Topic: Fourier Transforms?!  (Read 11791 times)

Offline Mr Andrew

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Fourier Transforms?!
« Reply #25 on: 14/11/2007 04:04:21 »
Yeah, I never said that was the best way to do it.  Although, maybe we do have the technology...all you would need is an antenna and something to graph current through the wire as a function of time.  Isn't that how a radio works, EM waves make the electrons in an antenna oscillate?  You'd just need an antenna with very low resistance (superconductor, maybe not so extreme) so that high frequency oscillations can be picked up.
 

Offline Bored chemist

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Fourier Transforms?!
« Reply #26 on: 14/11/2007 19:36:21 »
I's not the resistance of the antenna that's the problem; its having fast enough electronics to measure the signal. We could do it for radiowaves up to microwaves and just about into the mm wave regions but most of the IR, light, UV Xray and gamma ray spectra would elude us (not a problem for the cosmic microwave background obviously).
It's easier to do it differently and use a Fourier transform spectrometer- that will get us up to the UV.
http://en.wikipedia.org/wiki/Fourier_transform_spectroscopy
 

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Fourier Transforms?!
« Reply #26 on: 14/11/2007 19:36:21 »

 

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