Aperture vs Diameter - What's the difference?
aperture | diameter |
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
* Gilpin
* Owen
(optics) Something which restricts the diameter of the light path through one plane in an optical system.
(astronomy, photography) The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100 cm aperture.
(spaceflight, communications) The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array .
(mathematics, rare, of a right circular cone) The maximum angle between the two generatrices.
(geometry) Any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.
(geometry) The length of such a line.
(geometry) The maximum distance between any two points in a metric space
(graph theory) The maximum eccentricity over all vertices in a graph.
As nouns the difference between aperture and diameter
is that aperture is an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall while diameter is (geometry) any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.aperture
English
Noun
(en noun)- an aperture between the mountains
- the back aperture of the nostrils
- If the generatrix makes an angle ? to the axis, then the aperture is 2?.