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This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz.

Below infrared is the microwave portion of the electromagnetic spectrum.

Non-military uses include thermal efficiency analysis, environmental monitoring, industrial facility inspections, remote temperature sensing, short-ranged wireless communication, spectroscopy, and weather forecasting.

Infrared radiation extends from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 mm.

A commonly used sub-division scheme is: glass (silica) medium.

Like all EMR, IR carries radiant energy, and behaves both like a wave and like its quantum particle, the photon.

Infrared was discovered in 1800 by astronomer Sir William Herschel, who discovered a type of invisible radiation in the spectrum lower in energy than red light, by means of its effect on a thermometer.

Infrared radiation is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore invisible to the human eye. It extends from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz), to 1 millimeter (300 GHz)).

Most of the thermal radiation emitted by objects near room temperature is infrared.

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