INVISIBLE LIGHT


Please sign in to view the rest of this entry.

INVISIBLE LIGHT
INVISIBLE LIGHTOur eyes are perfectly tuned for the light of our sun. The sun puts out certain wavelengths of light, which our eyes pick up very well. There are, however, other wavelengths of light, and some of those are beyond our visual range. In other words, our eyes have limits, and beyond those limits we are blind. This is like a radio that can pick up the AM and FM bands, but not the shortwave bands. The shortwave signals are out there waiting, but your receiver cannot tune in to them.You have no doubt heard of infrared light; it is the type of light that television remote control units use. These light waves are useful, but we cannot see them. It is this type of light that we use for optical signals.It would be handy if we could use visible light in optical fibers, but it simply doesn'…
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. INVISIBLE LIGHT, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export