effective aperture

effective aperture

[ə¦fek·tiv ′ap·ə·chər]
(optics)
The diameter of the image of the aperture stop of an optical system, as viewed from the object.
References in periodicals archive ?
This behemoth will combine seven 8.4-meter mirrors for an effective aperture of 24.5 meters (80 feet).
The virtual fracture can represent different fracture network (i.e., the major flow pathway) with its effective aperture. To do so, we first define a fixed fracture zone in the numerical grid (e.g., 5 cm width in x-coordinate) and then use perimeter of the virtual fracture, [GAMMA], and the effective porosity of the fracture zone, [phi], defined as the fraction of the area occupied by fracture and total cross-section area of the fracture zone.
In practice, if you shoot at f5.6, the effective aperture (or shall we say,the volume of light that reaches the image sensor) is only f11.
In (7) and (8), [[delta].sub.r] and [[delta].sub.cr] denote the resolution limits in range and cross-range, respectively, while [lambda] is the wavelength, B is the imaging bandwidth, [L.sub.eff] is the effective aperture size of the SAR imaging system and R is the distance between the imager and the imaged object.
The TAGLens 2.0's focal length and effective aperture are controlled electronically by adjusting the amplitude and the frequency of the RF driving signal.
This corresponds to an effective aperture of 61.8 [cm.sup.2] (123.6[cm.sup.2] for the corresponding dual patch array).
* automatic bilevel or multilevel switching or continuous dimming daylight harvesting control in primary daylight zones under restrictive conditions related to effective aperture and size of zone
however the point must be made that by doing so, the effective aperture of the reducing lens is increased, as the ray cone from the primary lens is converging and so by projecting the aperture of the reducing lens onto the primary lens, it will have increased.
In technical terms, this is called reducing the entrance pupil, or restricting the effective aperture.
The end of the cavity-heating region is considered as the blackbody effective aperture for referencing distances.
The effective aperture of a radio telescope is an important parameter for radio astronomers; it gives the power spectral density (WH[z.sup.-1]) at the output of a (matched) receiving antenna per unit of incoming flux density (W[m.sup.-2]H[z.sup.-1]).

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