Chapter 4
Working with Infrared
IN THIS CHAPTER
Looking at ways to transmit information using infrared light
Creating infrared light
Detecting infrared light
Building a proximity detector
In this chapter, you learn how to work with circuits that detect the invisible light that’s commonly called infrared. Infrared light has all sorts of applications for wireless communication, the most common of which is the remote control for your television. Other uses for infrared include night-vision goggles and cameras, and temperature detection.
Have fun!
Introducing Infrared Light
Infrared light is light whose frequency is just below the range of visible red light. Specifically, infrared is light whose frequency falls between 1 THz to 400 THz (one THz is one trillion cycles per second). The infrared spectrum falls right between microwaves and visible light.
Remember from Chapter 1 of this minibook that there’s an inverse relationship between frequency and wavelength. In other words, the lower the frequency, the longer the wavelength. If you describe infrared in terms of its wavelength rather ...
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