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 ?
However, the angular resolution remains that of a single 8-metre telescope, unlike in the VLT Interferometer where the resolution is increased to that of a (virtual) telescope with an effective aperture equal to the maximum separation between the constituent telescopes.
It has nearly twice the collecting area of Arecibo's dish--which, although 305 m (1,000 feet) across, has an effective aperture of only 225 m for astronomical observations.
6, the effective aperture (or shall we say,the volume of light that reaches the image sensor) is only f11.
0's focal length and effective aperture are controlled electronically by adjusting the amplitude and the frequency of the RF driving signal.
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
Since the field/current, on the antenna aperture is not uniform, the concept of antenna effective aperture is established.
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.
The optical system adds depth and weight to the camera and reduces the effective aperture of the lenses it shares with Nikon 35mm cameras.
This will produce what amounts to a single antenna whose effective aperture is larger than Earth itself.