There is no universally accepted definition of the range of infrared radiation. Typically, it is taken to extend from the nominal red edge of the visible spectrum at 780 nm to 1 mm. This range of wavelengths corresponds to a See more

Infrared radiation is popularly known as "heat radiation", but light and electromagnetic waves of any frequency will heat surfaces that absorb them. Infrared light from the … See more

The discovery of infrared radiation is ascribed to William Herschel, the astronomer, in the early 19th century. Herschel published … See more

Sunlight, at an effective temperature of 5,780 K (5,510 °C, 9,940 °F), is composed of near-thermal-spectrum radiation that is slightly more than … See more

In general, objects emit infrared radiation across a spectrum of wavelengths, but sometimes only a limited region of the spectrum is of interest because sensors usually collect … See more

Night vision
Infrared is used in night vision equipment when there is insufficient visible light to see. See more

• Black-body radiation
• Infrared non-destructive testing of materials
• Infrared solar cells
• Infrared thermometer
• People counter See more