Difference between revisions of "Infrared light"

From Citizendium
Jump to: navigation, search
m (Add {{subpages}} and remove any categories (details))
(FLIR and NVD)
Line 2: Line 2:
  
 
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]].
 
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:
 
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:
Line 28: Line 27:
 
  |5.0 - 20.0 microns
 
  |5.0 - 20.0 microns
 
  |}
 
  |}
 +
 +
[[Forward-looking infrared]] viewing systems work in the LWIR, and, recently, MWIR.  [[Night vision devices]] often are sensitive into the NIR.

Revision as of 23:42, 24 July 2008

This article is a stub and thus not approved.
Main Article
Discussion
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
This editable Main Article is under development and subject to a disclaimer.

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

Forward-looking infrared viewing systems work in the LWIR, and, recently, MWIR. Night vision devices often are sensitive into the NIR.