Are you searchin for proof, that technical equipment is able to convert pieces of hidden frequency band for our eyes? Here is a collection of material, that show things hidden for the naked eye. Have a peek at physics, our eyes are very limited in frequency, but our technology is not. So you get these mixtures from eye frequency range and outside this band.
This has happened again and again and will not stop in future. Our technology show more frequency range, or so called the hidden world behind the frequency barrier.
To learn about the frequencies: http://en.wikipedia.org/wiki/Visible_spectrum