Seeing in the Dark: The Science of Infrared

Infrared
Infrared radiation is a type of electromagnetic radiation that has a wavelength range between about 700 nanometers (nm) and 1 millimeter, and a frequency range between about 430 terahertz (THz) and 300 GHz. It is located just beyond the visible light range in the electromagnetic spectrum. Infrared radiation is emitted by all objects that have a temperature above absolute zero, and it's the heat we feel from the sun and other sources. Infrared radiation is used in a wide variety of applications such as night vision, thermal imaging, remote control, and heating. It is also used in medicine, industry, and scientific research. Infrared cameras are widely used to see in complete darkness, and infrared heating is used in saunas and industrial processes. Infrared spectroscopy is a powerful analytical technique that is used to study the chemical composition of materials by measuring the absorption or reflection of infrared radiation.
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