~14 min read
Article
12 sectionsContents
- Definition
- In free space
- Conservation
- In refractions and reflections
- Brightness theorem
- Conservation of basic radiance
- As a volume in phase space
- Maximum concentration
- See also
- References
- Further reading
- External links
thumb|Conservation of etendue
Etendue or étendue () is a property of light in an optical system, which characterizes how "spread out" the light is in area and angle. It corresponds to the beam parameter product (BPP) in Gaussian beam optics. Other names for etendue include acceptance, throughput, light grasp, light-gathering power, optical extent, and the AΩ product. Throughput and AΩ product are especially used in radiometry and radiative transfer where it is related to the view factor (or shape factor). It is a central concept in nonimaging optics. The term étendue comes from French, where it means "extent".
Connections
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