In the unfiltered world there are no secrets. A wall or cloak blocks observation only by virtue of the limitations of vision, whether it's those of the naked human eye or mechanical seeing devices designed around the parameters of a naked eye. If somehow humans could see light waves at all frequencies (and make sense of it), we could see everything.
We've developed an impressive array of tools with which it's become possible to view the world at different frequencies of light, whether that involves the X-ray wavelengths used in radiography or the millimeter wave scanners (the sort that see through clothing) used now in many airports. While humans evolved to see a certain range of wavelengths for very good reasons—that's where most of the useful information about our physical, terrestrial world can be found—technology has made much more available to us.
As impressive and creepy as a millimeter wave scanner may seem, it's still just scratching the surface. Above these extremely high frequencies is another realm: terahertz radiation. Known also as submillimeter radiation or T-rays, it's possible to probe the invisible world even deeper, going beneath not just clothing but skin, plastics, cardboard, and other opaque materials. Getting at these waves has historically been prohibitively challenging in the engineering sense, but a team of researchers based at the University of Maryland claims to have solved one of the fundamental problems with T-ray detection: temperature.
Link
No comments:
Post a Comment