What does Etendue mean?
Definitions for Etendue
etendue
This dictionary definitions page includes all the possible meanings, example usage and translations of the word Etendue.
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Wiktionary
etenduenoun
a property of the light in an optical system; the product of its cross-sectional area (normal to the direction of propagation) and the solid angle it subtends.
Wikidata
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. From the source point of view, it is the area of the source times the solid angle the system's entrance pupil subtends as seen from the source. From the system point of view, the etendue is the area of the entrance pupil times the solid angle the source subtends as seen from the pupil. These definitions must be applied for infinitesimally small "elements" of area and solid angle, which must then be summed over both the source and the diaphragm as shown below. Etendue may be considered to be a volume in phase space. Etendue is important because it never decreases in any optical system. A perfect optical system produces an image with the same etendue as the source. The etendue is related to the Lagrange invariant and the optical invariant, which share the property of being constant in an ideal optical system. The radiance of an optical system is equal to the derivative of the radiant flux with respect to the etendue. The term étendue comes from the French étendue géométrique, meaning "geometrical extent". Other names for this property are acceptance, throughput, light-grasp, collecting 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. It is a central concept in nonimaging optics.
Numerology
Chaldean Numerology
The numerical value of Etendue in Chaldean Numerology is: 7
Pythagorean Numerology
The numerical value of Etendue in Pythagorean Numerology is: 2
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"Etendue." Definitions.net. STANDS4 LLC, 2024. Web. 19 Apr. 2024. <https://www.definitions.net/definition/Etendue>.
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