Infrared light: Difference between revisions
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imported>Niek Sanders (Fixed typo. Added IR subdivisions.) |
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In [[physics]], '''infrared (IR) light''' refers to a non-[[visible]] portion of the [[electromagnetic spectrum]] ranging from wavelengths of 750 nm to 1 mm. The name infrared comes from [[latin|Latin]] ''infra-'' meaning below, i.e., infrared has a lower frequency red in the [[spectrum]]. | In [[physics]], '''infrared (IR) light''' refers to a non-[[visible]] portion of the [[electromagnetic spectrum]] ranging from wavelengths of 750 nm to 1 mm. The name infrared comes from [[latin|Latin]] ''infra-'' meaning below, i.e., infrared has a lower frequency than red in the [[Electromagnetic spectrum|spectrum]]. | ||
Various disciplines further subdivide the IR, but there is no consensus on the divisions. They vary from discipline-to-discipline and even widely within a given discipline. The following table shows a typical set of divisions: | |||
{| class="wikitable" | |||
|- | |||
! Name | |||
! Acronym | |||
! Range | |||
|- | |||
|Near Infrared | |||
|NIR | |||
|0.7 - 1.4 microns | |||
|- | |||
|Short-Wave Infrared | |||
|SWIR | |||
|1.4 - 3.0 microns | |||
|- | |||
|Mid-Wave Infrared | |||
|MWIR | |||
|3.0 - 5.0 microns | |||
|- | |||
|Long-Wave Infrared | |||
|LWIR | |||
|5.0 - 20.0 microns | |||
|} | |||
[[Category: Physics Workgroup]] | [[Category: Physics Workgroup]] | ||
[[Category: CZ Live]] | [[Category: CZ Live]] | ||
Revision as of 13:12, 19 September 2007
In physics, infrared (IR) light refers to a non-visible portion of the electromagnetic spectrum ranging from wavelengths of 750 nm to 1 mm. The name infrared comes from Latin infra- meaning below, i.e., infrared has a lower frequency than red in the spectrum.
Various disciplines further subdivide the IR, but there is no consensus on the divisions. They vary from discipline-to-discipline and even widely within a given discipline. The following table shows a typical set of divisions:
| Name | Acronym | Range |
|---|---|---|
| Near Infrared | NIR | 0.7 - 1.4 microns |
| Short-Wave Infrared | SWIR | 1.4 - 3.0 microns |
| Mid-Wave Infrared | MWIR | 3.0 - 5.0 microns |
| Long-Wave Infrared | LWIR | 5.0 - 20.0 microns |