For other articles bearing the name of the physicist, see Fraunhofer.
The Fraunhofer distance, named after Joseph von Fraunhofer, is the value of:
where D is the largest dimension of the radiator (in the case of a magnetic loop antenna, the diameter) and is the wavelength of the radio wave. This distance provides the limit between the near and far field.
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The Fraunhoferdistance, named after Joseph von Fraunhofer, is the value of: d = 2 D 2 λ , {\displaystyle d={{2D^{2}} \over {\lambda }},} where D is the...
diffraction pattern is viewed at a sufficiently long distance (a distance satisfying Fraunhofer condition) from the object (in the far-field region),...
of the Sun Fraunhoferdistance, between near field and far field This disambiguation page lists articles associated with the title Fraunhofer. If an internal...
Joseph Ritter von Fraunhofer (/ˈfraʊnˌhoʊfər/; German: [ˈfraʊnˌhoːfɐ]; 6 March 1787 – 7 June 1826) was a German physicist and optical lens manufacturer...
defined in terms of the Fraunhoferdistance. Named after Joseph von Fraunhofer, the following formula gives the Fraunhoferdistance: d F = 2 D 2 λ , {\displaystyle...
optics, the Fraunhofer diffraction equation is used to model the diffraction of waves when the diffraction pattern is viewed at a long distance from the...
The Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, HHI, also known as Fraunhofer HHI or Fraunhofer Heinrich Hertz Institute, is...
which corresponds to the border between the Fresnel and Fraunhofer regions and denotes the distance at which the beam radiated by a reflector antenna is...
observation point the distance to the aperture is much bigger than the aperture size, propagation becomes well described by Fraunhofer diffraction. This propagation...
under test (AUT) a long distance away from the instrumentation antenna. Generally, the far-field distance or Fraunhoferdistance, D F r n h , {\displaystyle...
function. This analysis applies only to the far field (Fraunhofer diffraction), that is, at a distance much larger than the width of the slit. From the intensity...
built by Joseph von Fraunhofer in the early 1820s. The first of these was the Dorpat Great Refractor, also known as the Fraunhofer 9-inch, at what was...
1871, optical redshift was confirmed when the phenomenon was observed in Fraunhofer lines using solar rotation, about 0.1 Å in the red. In 1887, Vogel and...
a wave or periodic function is the distance over which the wave's shape repeats. In other words, it is the distance between consecutive corresponding points...
wavelength. Numerical approximations may be used, including the Fresnel and Fraunhofer approximations. Because diffraction is the result of addition of all waves...
parallax (to determine the distance to a star) were made by Friedrich Wilhelm Bessel in 1838 for the star 61 Cygni using a Fraunhofer heliometer. This was the...
case, valid only for much larger distances from the diffraction source, see Fraunhofer diffraction. Unlike Fraunhofer diffraction, Fresnel diffraction...
aberration. If the focal lengths of the two lenses for light at the yellow Fraunhofer D-line (589.2 nm) are f1 and f2, then best correction occurs for the condition:...
approximatively 1/3 bigger than Petzval’s. The correct optimum can be found with Fraunhofer approximation of the diffraction pattern behind a circular aperture at:...
unique Fraunhofer line designation, such as K for a line at 393.366 nm emerging from singly-ionized calcium atom, Ca+, though some of the Fraunhofer "lines"...
alternative to the Fraunhofer theory since the 1990s. Commercial laser diffraction analyzers leave to the user the choice of using either Fraunhofer or Mie theory...
discovered by Thomas Young and Augustin-Jean Fresnel. Using these principles, Fraunhofer was the first to use a diffraction grating to obtain line spectra and...
exhibit an Airy diffraction pattern far away from the aperture due to Fraunhofer diffraction (far-field diffraction). The conditions for being in the far...
physicist Joseph Fraunhofer also examined the solar spectrum, and found about 600 such dark lines (missing colors), are now known as Fraunhofer lines, or Absorption...
technology to his apprentice Joseph von Fraunhofer, who further developed this technology and also developed the Fraunhofer doublet lens design. The breakthrough...
time (Fraunhofer great refractor used by Struve and Fraunhofer heliometer by Bessel) were the first ones in history to establish the reliable distance scale...
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