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11 terms
Photonics Dictionary: G
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geometric x
G x
geometric center
The physical center of the lens; it is on the axis of the lens, halfway between the front and rear vertex. It is sometimes referred to as the mechanical center of the lens.
geometric concentration
->
area concentration
The ratio of aperture area over receiving area for a specific lens. Also called geometric concentration.
geometric extent
->
etendue
A product of the area of a light beam (normal to its direction of propagation) and the solid angle that the beam includes; flux per unit radiance or luminance. Alternative terms: geometric extent,...
geometric image
The position and shape of the image of a point source, as predicted by geometric optics alone. The geometric image is to be differentiated from the diffraction image, which is determined from...
geometric metamerism
Metamerism that occurs when the geometry of illumination or viewing is changed.
geometric operations
In image processing, mathematical operations that change spatial geometry, as for instance scaling, translating, rotating or otherwise manipulating the perspective. Also called geometric manipulation.
geometric optics
A field of physics that deals with light as if it truly were composed of rays diverging in various directions from the source and abruptly bent by refraction or turned by reflection into paths...
geometric phase shifting
A technique used to create an achromatic phase shift based on the principle of geometric phase. The phase shift is experienced by a light beam as a result of a cyclic change in its state of...
Geometrical optics
The area of optics in which the propagation of light is described by geometrical lines (or rays) governed by Fermat's Principle. Geometrical optics is useful as long as the objects in which the light...
GMTF
geometric modulation transfer function
grinding
The process in the manufacture of an optical system that gives it the required geometric shape.
Photonics Dictionary
G
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