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IMAGE FOCAL POINT [6 records]

Record 1 2017-05-05

English

Subject field(s)
  • Optics
DEF

[Law according to which] there should be no difference in retinal image size in the correction of spherical axial anisometropia, provided that the lenses are placed at the anterior focal point of the eye.

French

Domaine(s)
  • Optique
DEF

Loi [selon laquelle] un verre correcteur placé dans le plan focal objet d'un œil amétrope suivant l'axe forme une image dont la dimension est égale à celle [qui est] formée par un œil emmétrope.

Spanish

Save record 1

Record 2 2011-02-11

English

Subject field(s)
  • Optics
  • Scientific Research Equipment
CONT

A confocal laser scanning microscope is a light microscope having a dramatically higher axial resolution than a conventional microscope. In other words, a confocal microscope is capable of optical sectioning. This is accomplished by illuminating the specimen one point at a time with a focused laser beam and using an optical arrangement, where only the light originating from the focus can be detected. The image is formed by scanning the laser beam over the specimen and recording the image into computer memory. A three-dimensional view of the specimen can be reconstructed from a stack of such images taken at successive focal planes.

French

Domaine(s)
  • Optique
  • Matériel et équipement (Recherche scientifique)
CONT

[...] la résolution optique [est augmentée] de l'ordre de 30%, soit une résolution latérale de 0.18 µm et axiale de 0.59 µm pour une ouverture numérique de 1,4 et une longueur d'onde 550 µm.

Spanish

Save record 2

Record 3 2009-06-12

English

Subject field(s)
  • Radiological Physics (Theory and Application)
CONT

In conventional fashion, the anti-diffusion grid is composed of a series of plates that are all directed toward the focal point of X-ray radiation emitted in the direction of the object and of the image receiver. Thus, the anti-diffusion grid allows the undiffused direct beams to pass, while the diffused beams are absorbed by the plates.

French

Domaine(s)
  • Physique radiologique et applications
DEF

Dispositif comportant des bandes alternées de matériaux transparents et opaques, laissant passer le rayonnement primaire et absorbant, en partie, les rayonnements secondaires obliques.

Spanish

Campo(s) temático(s)
  • Física radiológica (Teoría y aplicación)
DEF

Elemento constituido por varillas finas de metal, generalmente de plomo, dispuestas en paralelo o con una ligera inclinación, que actúan absorbiendo la radiación difusa, que no incide de forma perpendicular en los espacios existentes entre ellas y mejoran la calidad de la imagen.

Save record 3

Record 4 1999-09-10

English

Subject field(s)
  • Photography
  • Optics
CONT

When the object is at infinity, and the incident rays are parallel to the lens axis, the image is the principal focal point and lies on the axis of the lens.

French

Domaine(s)
  • Photographie
  • Optique
DEF

Foyer se trouvant sur l'axe optique d'un système.

Spanish

Save record 4

Record 5 1996-12-09

English

Subject field(s)
  • Response Systems (Electronic Instrumentation)
  • Adaptive Automated Systems
DEF

Image of a point source formed by an optical system at its focal point. The size of the blur circle is affected by the quality of the optical system and its focus.

French

Domaine(s)
  • Systèmes cybernétiques de réaction
  • Systèmes automatiques adaptatifs
OBS

Tâche de diffraction : terme proposé dans ISO/CEI JTC N1746 (Vision artificielle), 1995.

Spanish

Save record 5

Record 6 1991-05-14

English

Subject field(s)
  • Computer Graphics

French

Domaine(s)
  • Infographie

Spanish

Save record 6

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