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See searches and references containing ANGULAR APERTURE!ANGULAR APERTURE
Characteristic of an optical system
constant across an interface; NA = n1 sin θ1 = n2 sin θ2. In air, the angular aperture of the lens, a = 2 θ {\displaystyle a=2\theta } , is approximately
Numerical_aperture
Ability of any image-forming device to distinguish small details of an object
diffraction. In that case, the angular resolution of an optical system can be estimated (from the diameter of the aperture and the wavelength of the light)
Angular_resolution
The angular aperture a {\displaystyle a} of a lens is the angular size of the lens aperture as seen from the focal point: a = 2 arctan ( D / 2 f ) =
Angular_aperture
How large a sphere or circle appears
and in optics, it is the angular aperture (of a lens). The angular diameter can alternatively be thought of as the angular displacement through which
Angular_diameter
Mixing signals from many telescopes to produce images with high angular resolution
Aperture synthesis or synthesis imaging is a type of interferometry that mixes signals from a collection of telescopes to produce images having the same
Aperture_synthesis
Optical instrument to view patterns due to repeated reflection
forms and colours for varying the direction of the motion across the angular aperture and for accommodating the velocity of their motion to the effect which
Kaleidoscope
Hole or opening through which light travels
Enrichment Center that the game series takes place in. Numerical aperture Antenna aperture Angular resolution Diaphragm (optics) Waterhouse stop Bokeh Shallow
Aperture
Process of enlarging the apparent size of something
magnification is the ratio between the apparent (angular) size as seen via instrument and the angular size of the object when the object is placed at the
Magnification
Maximum angle at which incoming sunlight can be captured by a solar concentrator
angle for a given concentration. Figure "angular aperture of sunlight" on the right shows the effect of the angular dispersion of sunlight on the acceptance
Acceptance angle (solar concentrator)
Acceptance_angle_(solar_concentrator)
Diffraction pattern in optics
the mean of visible wavelengths). This is equal to the angular resolution of a circular aperture. The Rayleigh criterion for barely resolving two objects
Airy_disk
Measure of the "spread" of light in an optical system
^{2}\alpha }}\,,} where C is the concentration of the optic. For a given angular aperture α, of the incoming light, this concentration will be maximum for the
Etendue
Optical system with resolution performance at the instrument's theoretical limit
proportional to the diameter of its objective's entrance aperture. For telescopes with circular apertures, the size of the smallest feature in an image that
Diffraction-limited_system
Topics referred to by the same term
Acceptance angle may refer to: Half of the angular aperture of an optical system Acceptance angle (optical fiber), the angle in an optical fiber below
Acceptance_angle
Study of interactions between sound and light
C. (October 1974). "Noncollinear acousto-optic filter with large angular aperture". Applied Physics Letters. 25 (7): 370–372. doi:10.1063/1.1655512.
Acousto-optics
Aiming device
sight inserts, and adjustable aperture mechanisms. Front aperture size is a compromise between a tight enough aperture to clearly define the aiming point
Iron_sights
Form of radar used to create images of landscapes
Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as
Synthetic-aperture_radar
Far-field diffraction
can be applied, and shows Fraunhofer diffraction patterns for various apertures. A detailed mathematical treatment of Fraunhofer diffraction is given
Fraunhofer_diffraction
in that area make comparing synthesized aperture irregular. For instance, Keck I or II alone has less angular resolution than the Keck Interferometer
List of largest optical telescopes in the 20th century
List_of_largest_optical_telescopes_in_the_20th_century
Type of linear operator on a Banach sapce
_{\omega }} is open and symmetric over the positive real axis with angular aperture 2 ω {\displaystyle 2\omega } . Markus Haase (2006), Birkhäuser Basel
Sectorial_operator
Surface on an antenna in electromagnetics
In electromagnetics and antenna theory, the aperture of an antenna is defined as "A surface, near or on an antenna, on which it is convenient to make assumptions
Aperture_(antenna)
Distance over which a wave's shape repeats
objective. The angular size of the central bright portion (radius to first null of the Airy disk) of the image diffracted by a circular aperture, a measure
Wavelength
Satellite communication system with small dish antenna
A very-small-aperture terminal (VSAT) is a two-way satellite ground station with a dish antenna that is smaller than 3.8 meters. The majority of VSAT antennas
Very-small-aperture_terminal
Observatory in Chile
and 280 GHz. To achieve a high-enough angular resolution for some of the science goals, a telescope with an aperture larger than about 5 meters is needed
Simons_Observatory
Type of angular momentum in light
The orbital angular momentum of light (OAM) is the component of angular momentum of a light beam that is dependent on the field spatial distribution,
Orbital angular momentum of light
Orbital_angular_momentum_of_light
Telescope in the Atacama Desert, Chile
very high angular resolution. The VLT array is also complemented by four movable Auxiliary Telescopes (ATs) with 1.8-metre (5.9 ft) apertures. The VLT
Very_Large_Telescope
Main opening of the shell, where the head-foot part of the body of the animal emerges
infraparietal parietal angular and twin paraller Siphonal notch Siphonal canal "Aperture shape Bean". accessed 3 January 2011. "Aperture shape Crescent". accessed
Aperture_(mollusc)
Telescope for observations with visible light
angular resolution of an optical telescope is determined by the diameter of the primary mirror or lens gathering the light (also termed its "aperture")
Optical_telescope
Branch of optics
inner points P. The light crossing this point is confined to a cone of angular aperture 2α. A line f is also shown whose tangent at point P bisects this cone
Nonimaging_optics
Ultrasound technology
(illuminance) to the aperture size is known as the F-number. Dynamic aperture is keeping this number constant by growing the aperture with the imaging depth
Dynamic_aperture
Use of mirror or lens assemblies to generate current from multi-junction solar cells
all factored in, the system must still be able to capture the finite angular aperture of sunlight. CPV systems are categorized according to the amount of
Concentrator_photovoltaics
Directional radio antenna used in radio astronomy
and 94 GHz. The world's largest filled-aperture (i.e. full dish) radio telescope is the Five-hundred-meter Aperture Spherical Telescope (FAST) completed
Radio_telescope
Atmospheric distortions of light
parameter describes the size of an imaginary telescope aperture for which the diffraction limited angular resolution is equal to the resolution limited by seeing
Astronomical_seeing
Camera technique
"preset" aperture, which lets the photographer set the lens to working aperture, and then quickly switch between working aperture and full aperture without
Tilt–shift_photography
Optical property
spatial Fourier transform of the aperture field (up to scaling and phase factors). In numerical calculations, angular-spectrum and related convolution-based
Fresnel_number
Proposed NASA space telescope
Astrophysics Decadal Survey recommended development of a "large (~6 m aperture) infrared/optical/ultraviolet (IR/O/UV) space telescope", with the science
Large Ultraviolet Optical Infrared Surveyor
Large_Ultraviolet_Optical_Infrared_Surveyor
Array used for astronomical observations
that it can theoretically produce images with the angular resolution of a huge telescope with an aperture equal to the separation, called baseline, between
Astronomical_interferometer
Spacing between measurements
spatial resolution is directly connected to angular resolution, other instruments, like synthetic aperture radar or a network of weather stations, produce
Spatial_resolution
English astronomical interferometer observatory
Optical Aperture Synthesis Telescope, is a multi-element optical astronomical interferometer with baselines of up to 100 metres, which uses aperture synthesis
Cambridge Optical Aperture Synthesis Telescope
Cambridge_Optical_Aperture_Synthesis_Telescope
Optical multiplexing technique
Orbital angular momentum multiplexing is a physical layer method for multiplexing signals carried on electromagnetic waves using the orbital angular momentum
Orbital angular momentum multiplexing
Orbital_angular_momentum_multiplexing
Type of antenna
called the aperture efficiency. The aperture efficiency of typical parabolic antennas is 0.55 to 0.70. It can be seen that, as with any aperture antenna
Parabolic_antenna
Device in optics that reduces light intensity
is required to work at 100% of its aperture (usually because the system is required to work at its maximal angular resolution). In practice, ND filters
Neutral-density_filter
SI derived unit of solid angle
the same projected area. A solid angle of one steradian subtends a cone aperture of approximately 1.144 radians or 65.54 degrees. In the SI, solid angle
Steradian
Type of quadrant used by medieval Arabic astronomers
functions as a projection screen. When the apertures are optically aligned with the Sun, the user reads the angular measurement of the point where the graduated
Sine_quadrant
Subfield of astronomy that studies celestial objects at radio frequencies
of radio interferometry and aperture synthesis. The use of interferometry allows radio astronomy to achieve high angular resolution, as the resolving
Radio_astronomy
Major astronomical facility in Chile
width of the opening, can be raised and lowered in front of the telescope aperture to restrict the wind. The dome design ensures that the dome provides sufficient
Extremely_Large_Telescope
Radio galaxy in the constellation Ursa Major
04 mJy. The total k-band magnitude of the galaxy is 14.50 within an angular aperture of three arcseconds. The rest-frame radio luminosity at 151 MHz is
6C_1132+3209
Computational imaging technique in microscopy
optical microscopy that consists in the synthesis of a wider numerical aperture from a set of full-field images acquired at various coherent illumination
Fourier_ptychography
How much a beam expands as it travels
divergence is an angular measure of the increase in beam diameter or radius with distance from the optical aperture or antenna aperture from which the beam
Beam_divergence
Lens or mirror in optical instruments
telescope's light-gathering power and angular resolution are both directly related to the diameter (or "aperture") of its objective lens or mirror. The
Objective_(optics)
Type of optical telescope
has been superseded by the reflecting telescope, which allows larger apertures. A refractor's magnification is calculated by dividing the focal length
Refracting_telescope
Method for detecting and tracking objects that give off infrared radiation
not add to an aircraft's emissions signature. Within range, an IRST's angular resolution is better than radar because infrared has a shorter wavelength
Infrared_search_and_track
Telescope in the Wilhelm Foerster Observatory
and an aperture ratio of a good 1/16 respectively: k = f D ≈ 15.6 {\displaystyle k={\frac {f}{D}}\approx 15.6} The image-side angular aperture is: ω b
Bamberg-Refraktor
History of a radar technology
The history of synthetic-aperture radar begins in 1951, with the invention of the technology by mathematician Carl A. Wiley, and its development in the
History of synthetic-aperture radar
History_of_synthetic-aperture_radar
Australian astronomer
astronomer who has pioneered the science of high-angular resolution astronomy, leading the development of aperture masking interferometry and astronomical optical
Peter_Tuthill_(astronomer)
Global radio telescope array
electronically, with an effective aperture which is the diameter of the entire planet, substantially improving its angular resolution. The effort includes
Event_Horizon_Telescope
Semi-automatic rifle
Remington and 5.56×45mm NATO, the Ranch Rifle with a civilian style rear aperture sight and integral scope ring mounts on the receiver, the Mini-14 GB with
Ruger_Mini-14
Species of land snail
rounded above and below an angular periphery, with impressed sutures and closely spaced radial ribs. It has an ovately lunate aperture and narrowly open umbilicus
Allenella_planorum
Width of an electromagnetic beam
can also refer to the angular diameter (i.e., angular width), which is the angle subtended by the beam at the source. The angular width is also called
Beam_diameter
German physicist, entrepreneur, and social reformer (1840–1905)
criterion stipulates that an angular separation cannot be less than the ratio of the wavelength to the aperture diameter, see angular resolution). Already a
Ernst_Abbe
Technique of measuring distances with a telescopic instrument
(tangent[broken anchor]) is constant. By using a reticle with marks of a known angular spacing, the principle of similar triangles can be used to find either
Stadiametric_rangefinding
micrometers. When divided by the lens or mirror focal length, this gives the angular size of the PSF, typically expressed in arc-seconds when specifying astronomical
Encircled_energy
Instrument that makes distant objects appear magnified
otherwise possible. A larger aperture does not just mean that more light is collected, it also enables a finer angular resolution. Telescopes may also
Telescope
Sparrow's resolution limit is an estimate of the angular resolution limit of an optical instrument. When a star is observed with a telescope, the light
Sparrow's_resolution_limit
Radio telescope in Bad Münstereifel, Germany
which has a slightly larger elliptical 100-by-110-metre (330 by 360 ft) aperture. The telescope is located about 1.3 km northeast of Effelsberg, a southeastern
Effelsberg 100-metre Radio Telescope
Effelsberg_100-metre_Radio_Telescope
Species of gastropod
subtuberculated angular, prominent carinae. The shell is pale, varied with brown spots. The spire is elevated. The oblique aperture is nearly circular
Stomatia_decussata
Red supergiant star in the constellation Orion
extrasolar star whose photosphere's angular size was measured in 1920, and subsequent studies have reported an angular diameter (i.e., apparent size) ranging
Betelgeuse
Sony lens
extended to the Z-axis (near-far) in addition to horizontal, vertical and angular stabilisation. List of Sony E-mount lenses Clark, Mitchell (2025-09-30)
Sony FE 100mm F2.8 Macro GM OSS
Sony_FE_100mm_F2.8_Macro_GM_OSS
NASA satellite of the Explorer program
look direction that was normal to the spacecraft spin axis and had an angular aperture between 48° and 64° (depending on coincidence mode considered). Coincidence
Explorer_43
Species of gastropod
lines are perceptible, but to the naked eye the shell seems smooth. The aperture is narrow. The anal sulcus is wide and shallow, beginning at the suture
Paraspirotropis_simplicissima
Extinct species of gastropod
elevated. The shell contains about five angular whorls. The siphonal canal is short, obliquely curved. The aperture is contracted. Fossils of this marine
Pleurotomella_insignifica
Astronomical optical telescope
resulting in a total hexagonal mirror of 11.1 by 9.8 m. However, its effective aperture is only 9.2 m. It is located close to the town of Sutherland in the semi-desert
Southern African Large Telescope
Southern_African_Large_Telescope
Compact astronomical body
hole shadow. The angular resolution of a telescope is based on its aperture and the wavelengths it is observing. Because the angular diameters of Sagittarius
Black_hole
Monochrome light beam whose amplitude envelope is a Gaussian function
(\mathbf {E} (r,z)\cdot e^{i\omega t}),} where ω {\textstyle \omega } is the angular frequency of the light and t is time. The time factor involves an arbitrary
Gaussian_beam
the magnetic fields of stars List of directly imaged exoplanets Angular resolution Angular diameter List of nearest stars Published 2024 based on observations
List of stars with resolved images
List_of_stars_with_resolved_images
Proposed extremely large telescope
for an extremely large telescope, which was intended to have a single aperture of 100 metres in diameter. Because of the complexity, cost, and risk of
Overwhelmingly Large Telescope
Overwhelmingly_Large_Telescope
British astronomer
performed the first Aperture Masking Interferometry observations, and then led the construction and operation of the Cambridge Optical Aperture Synthesis Telescope
John_E._Baldwin
Technique used in optical systems
the limit imposed by atmospheric distortion, such as speckle imaging, aperture synthesis, and lucky imaging, or by moving outside the atmosphere with
Adaptive_optics
Formula used in radio astronomy
source to P 1 {\displaystyle P_{1}} , ω {\displaystyle \omega } is the angular frequency of the light, and A {\displaystyle A} is the complex amplitude
Van_Cittert–Zernike_theorem
Device for measuring a physical quantity
(pressure) Stroboscope Tachometer For the value-ranges of angular velocity see: Orders of magnitude (angular velocity) For the ranges of frequency see: Orders
List_of_measuring_instruments
Species of gastropod
base ; umbilical concavity almost two-thirds major diameter of base. The aperture is circular. The peristome is thin, overhangs above and is connected across
Argalista_rotella
Optical device
perspective preserved. To produce a reasonably clear projected image, the aperture is typically smaller than 1/100 the distance from the screen. As the pinhole
Camera_obscura
Branch of physics that studies light
}{D}}} where θ is the angular resolution, λ is the wavelength of the light, and D is the diameter of the lens aperture. If the angular separation of the two
Optics
Response if an optical system to a point source of light
is because the lens has only a finite (angular) bandwidth, or finite intercept angle. Therefore, any angular bandwidth contained in the source, which
Point_spread_function
Ability of an imaging system to resolve detail
}{D}}} where θ is the angular resolution in radians, λ is the wavelength of light in meters, and D is the diameter of the lens aperture in meters. Two adjacent
Optical_resolution
Galaxy cluster in the constellation Phoenix
has an uncertain morphology. Based on the "total" aperture at the K-band, Phoenix A has an angular diameter of 16.20 arcseconds, corresponding to a large
Phoenix_Cluster
wavelength. Typically this area is measured by angular size. Poor seeing or a larger telescope aperture will decrease the size of a patch. Thus, the patch
Isoplanatic_patch
Image scanning device
small aperture scans over the entire field of view. The actual amount of light gathered is instantaneous, occurring through a very small aperture, and
Nipkow_disk
Optical illusion
required. When shooting with forced perspective, it's important to have the aperture stopped down sufficiently to achieve proper depth of field (DOF), so that
Forced_perspective
) {\displaystyle r_{0}\equiv r(\varphi =0)} to account for the finite aperture and slit widths (typically 0.1 to 5 mm): r ( φ ) = r 0 [ ( 1 − c 2 ) cos
Hemispherical electron energy analyzer
Hemispherical_electron_energy_analyzer
Species of gastropod
compressed. The aperture is remarkably high and oblong, displaying lateral compression. The upper part of the aperture is sharply angular, and the edges
Amnicola_ricardi
Lens with a variable focal length
complexity – and some compromises on image quality, weight, dimensions, aperture, autofocus performance, and cost. For example, all zoom lenses suffer from
Zoom_lens
Six points which determine imaging properties of an optical system
that goes through the centre of a lens without any angular deviation. For a lens in air with the aperture stop at the principal planes, this would be a chief
Cardinal_point_(optics)
Species of flowering plant
micropylora is covered with a myriad of tiny markings. The very small aperture of the corona makes its identification easy. "New species of Rafflesia
Rafflesia_micropylora
Species of gastropod
fusiform shell is cancellated. The spire is as long as the aperture. The whorls are angular. The body whorl is acuminated anteriorly, ornamented in the
Nodicostellaria_laterculata
Species of gastropod
yellowish marked with some faint angular brown lines or with white belts at the suture, periphery and base, and marked with angular brown lines, and a row of
Zafra_hahajimana
Species of gastropod
solid, acute shell is biconic. Its color is olive brown with a purplish aperture. The protoconch contains two whorls, the first minute, smooth, rounded
Crassispira_erigone
Process of improving the accuracy and precision of a gun
measures (a 30 mm group at 100 m, or a one inch group at 100 yards) or in angular measures (a milliradian or MOA group). Groups for rifles are traditionally
Accurizing
Technical design of the components of a radar and its operation
Synthetic aperture radar (SAR) allow for an angular resolution beyond real beamwidth by moving the aperture over the target, and adding the echoes coherently
Radar_engineering
Measure in 3-dimensional geometry
{\displaystyle 4\pi } . Solid angles can also be measured in squares of angular measures such as degrees, minutes, and seconds. A small object nearby may
Solid_angle
vertical strips that were curved into a cylinder. These strips act as an aperture that light passes through, so when a viewer is to look through them, a
Holographic_optical_element
ANGULAR APERTURE
ANGULAR APERTURE
Boy/Male
Gujarati, Hindu, Indian, Kannada
Spark of Fire
Boy/Male
Arabic, Hindu, Indian, Muslim
Shining
Boy/Male
Hindu, Indian, Kannada, Tamil
Witty; Super
Girl/Female
American, Australian, British, English
Beautiful Goddess
Girl/Female
French Spanish American Italian Latin Greek
Angel.
Girl/Female
Muslim
Unique, Singular, Exclusive
Girl/Female
Afghan, American, British, Christian, English, Finnish, French, Greek, Indian, Irish, Lebanese, Polish, Portuguese, Romanian, Spanish, Swedish, Tamil
Heavenly Messenger; Angel; Messenger from God
Boy/Male
Hindu, Indian, Tamil
Regular Winner
Girl/Female
Indian
Unique, Singular
Girl/Female
Christian & English(British/American/Australian)
Angelic
Girl/Female
Assamese, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Sindhi, Tamil, Telugu
Not Wild; Gentle
Boy/Male
Indian, Sanskrit
Praising; A Hymn
Female
English
Feminine form of Latin Angelus, ANGELA means "angel, messenger."
Girl/Female
Muslim
Unique, Singular
Girl/Female
Arabic, Muslim
Unique; Singular
Girl/Female
Muslim
Unique, Singular, Exclusive
Girl/Female
Indian, Tamil
Lovely; Kind-hearted
Girl/Female
Muslim
Unique, Singular, Exclusive
Boy/Male
Indian, Sanskrit
Radiant; Bright; Enlightening
Boy/Male
Arabic, Muslim, Parsi, Pashtun
Embers
ANGULAR APERTURE
ANGULAR APERTURE
Girl/Female
Hindu, Indian, Tamil
Who Bestows Grain
Male
Greek
Greek form of Persian Ardeshir, the name of the founder of the Artaxiad dynasty, ARTAXIAS means "great warrior" or "lion-king."
Boy/Male
Indian
Active
Boy/Male
Indian
God
Boy/Male
Hindu, Indian
Sukh; Happy
Boy/Male
Indian
Devine
Surname or Lastname
English
English : from Middle English pē ‘peacock’ (see Peacock).
Boy/Male
Indian, Tamil
Granth
Boy/Male
Hindu
Water like
Girl/Female
Latin
Mother of Asopus.
ANGULAR APERTURE
ANGULAR APERTURE
ANGULAR APERTURE
ANGULAR APERTURE
ANGULAR APERTURE
a.
Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin.
a.
Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp-cornered; pointed; as, an angular figure.
a.
Measured by an angle; as, angular distance.
v. t.
To make angular.
adv.
In an angular manner; angularly.
n.
The singular number, or the number denoting one person or thing; a word in the singular number.
a.
Denoting one person or thing; as, the singular number; -- opposed to dual and plural.
a.
Constituted, selected, or conducted in conformity with established usages, rules, or discipline; duly authorized; permanently organized; as, a regular meeting; a regular physican; a regular nomination; regular troops.
a.
Standing by itself; out of the ordinary course; unusual; uncommon; strange; as, a singular phenomenon.
a.
Fig.: Lean; lank; raw-boned; ungraceful; sharp and stiff in character; as, remarkably angular in his habits and appearance; an angular female.
a.
Conformed to a rule; agreeable to an established rule, law, principle, or type, or to established customary forms; normal; symmetrical; as, a regular verse in poetry; a regular piece of music; a regular verb; regular practice of law or medicine; a regular building.
a.
Each; individual; as, to convey several parcels of land, all and singular.
a.
Of or pertaining to the throat or neck; as, the jugular vein.
a.
Of or pertaining to the jugular vein; as, the jugular foramen.
a.
Thorough; complete; unmitigated; as, a regular humbug.
adv.
In an angular manner; with of at angles or corners.
a.
Pertaining to, or having the form of, a ring; forming a ring; ringed; ring-shaped; as, annular fibers.
a.
Having the form of a ring; annular.
a.
Not angular.
pl.
of Ungula