PROJECT 3Invisible Light Basics
NIGHT VISION IS one of the most important factors when considering any kind of video-operated spy gadget as this technology allows the viewer to see in complete darkness while the subject is completely unaware. Because infrared light (radiation) falls just below red on the visible light spectrum, making up the wavelengths from about 750 to 1500 nanometers (nm), this light cannot be seen by human eyes but it can easily be seen by many video cameras, making it useful as a covert lighting method in night vision systems. A common example of infrared light is the medium for communication between your remote control and television set. The LED on the end of your remote sends out pulses of infrared light, which is received ...
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