Far infrared
Far Infrared
Far Infrared (pronunciation: /fɑːr ˈɪnfrəˌrɛd/), often abbreviated as FIR, is a region in the infrared spectrum of electromagnetic radiation. Far infrared is often defined as any radiation with a wavelength of 15 micrometers (µm) to 1 mm (corresponding to a range of about 20 THz to 300 GHz), which places far infrared radiation within the C band (2 to 4 micrometers) and E band (60 to 90 GHz) of the electromagnetic spectrum.
Etymology
The term "infrared" comes from the Latin infra, meaning "below". "Red" is the color of the longest wavelengths of visible light. Infrared light has a longer wavelength (and therefore lower frequency) than that of red light, which is why it is named "below red".
Related Terms
- Infrared: The entire spectrum of light radiation beyond the visible spectrum, of which far infrared is a part.
- Near Infrared: The adjacent part of the infrared spectrum, closer to the visible spectrum.
- Mid Infrared: The part of the infrared spectrum between near and far infrared.
- Electromagnetic Spectrum: The entire range of light radiation, from radio waves to gamma rays, including the infrared spectrum.
- C band: A portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 8 gigahertz (GHz).
- E band: A portion of the electromagnetic spectrum corresponding to radio waves with frequencies in the range of 60 to 90 GHz.
External links
- Medical encyclopedia article on Far infrared
- Wikipedia's article - Far infrared
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