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A couple of words of radio-waves and spectroscopy


Spectra of Hydrogen and Helium
(Picture I)
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Kimmo Huosionmaa

The most modern radar technology bases the same technology, what is used in the radio astronomy. One of the most interesting parts of this technology is so-called radio-spectrometer, what is used to determine the elements what is in some target. Those echoes can be separated by using Prisma or hila, what would help to get the spectrum visible. And the black lines in the spectrum are caused by the elements, what is sending the radiation.

Radio-spectrometer works like normal spectrometer, what would send to the laser-ray to the target, and then every atom would send the radiation in their unique frequency. Every element in the universe has the own frequency of electromagnetic radiation, and that would help to detect the elements what the target consists. The radio spectrometer would work in the same way, but the echo, what the elements would give are coming in the radio-frequency, but the methodology that is used is similar to the normal spectroscopic.

The reason for those dark lines, what is seen in spectroscopic photos is that when some element sends the radiation, would that wave movement cause that the waves would weaken. Actually, that phenomenon caused by the polarization of that frequency. Some scientists believe that this phenomenon can be used to make an object invisible in the frequency of light. Every electromagnetic radiation can be turned away from the object like radio waves, and in theory is possible to make the form where the light would travel across it like in STEALTH-aircraft.


Another way to make some object invisible to the human eye would be used the led-light, what would suppress the waves with counter waves, that the light would not snap from the surface of the object. But this technology needs that every frequency of the electromagnetic radiation must be suppressed differentially.  This means that every frequency of the spectrum must be made own led-lights, what would send the counter light exactly with the same power and frequency, what the incoming radiation has.


The effect is similar like in scenario, that somebody would send the counter waves from the beach to sea. If the counterwaves could send against incoming waves they would suppress even the large tsunamis, because every wave, what would hit the tsunami, will decrease its energy, but, of course, the huge turbines can be used against those waves, but this technology needs large-scale investors. And that's why this is possible in the distant future.

Picture I


https://www.sciencephoto.com/image/664032/530wm/C0250250-Hydrogen_and_helium_spectra-SPL.jpg
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