Wireless Security: Know It All
by Praphul Chandra, Frank Thornton, Chris Lanthem, Jon S. Wilson, Dan Bensky, Tony Bradley, Chris Hurley, Steve A. Rackley, John Rittinghouse PhD CISM, James F. Ransome PhD CISM CISSP, Timothy Stapko, George L Stefanek
Chapter 5. Infrared Communication Basics
5.1. The Ir Spectrum
The infrared (Ir) part of the electromagnetic spectrum covers radiation having a wavelength in the range from roughly 0.78 μm to 1000 μm (1 mm). Infrared radiation takes over from extremely high frequency (EHF) at 300 GHz and extends to just below the red end of the visible light spectrum at around 0.76 μm wavelength. Unlike radio frequency radiation, which is transmitted from an antenna when excited by an oscillating electrical signal, infrared radiation is generated by the rotational and vibrational oscillations of molecules.
The infrared spectrum is usually divided into three regions, near, middle and far, where “near” means nearest to visible light (Table 5.1). Although all infrared ...