TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

The sensitivity vector concept can be better understood by means of a useful scheme called the [holodiagram]. It consists in drawing the loci of points showing the constant sum of the distances between a generic point P and two other points, figuring a light source A and an observation point B.  2, record 1, English, - holodiagram

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

A number of methods for self-reference holography in white light have been proposed, and they can be conditionally divided into two groups. One is a group that uses a self-illuminating object or an object illuminated by an incoherent light source, considered to be a set of point sources that are not correlated with each other.  2, record 2, English, - self%2Dreference%20holography

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

Applied to any gemstone which, when cut cabochon, exhibits under a single, strong point source, a sharp, well-defined light band, line or streak of white light across the dome of the stone, which moves as the stone is turned about.  2, record 3, English, - cat%26rsquo%3Bs%2Deye

Record number: 3, Textual support number: 1 OBS

The term "cat’s-eye" refers to the optical phenomenon of chatoyancy. Gemstones displaying chatoyancy must be described by their mineral name or variety followed by the suffix "cat’s-eye".  3, record 3, English, - cat%26rsquo%3Bs%2Deye

Record number: 3, Textual support number: 1 PHR

Enstatite cat’s-eye.  4, record 3, English, - cat%26rsquo%3Bs%2Deye

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Se dit [...] pour les variétés de gemmes chatoyantes [...] dont le nom doit précéder l'appellation «œil-de-chat».  1, record 3, French, - %26oelig%3Bil%2Dde%2Dchat

Record number: 3, Textual support number: 1 CONT

La désignation «œil de chat» désigne un phénomène optique de chatoiement. Les pierres présentant cette caractéristique doivent être désignées par leur nom de minéral suivi de la mention «œil de chat».  2, record 3, French, - %26oelig%3Bil%2Dde%2Dchat

Record number: 3, Textual support number: 1 PHR

Quartz œil-de-chat.  1, record 3, French, - %26oelig%3Bil%2Dde%2Dchat

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

The bright central spot in the system of diffraction rings formed by an optical system with light from a point source(as a star).  6, record 4, English, - Airy%20disk

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Cercle lumineux occupant le centre de la figure de diffraction à symétrie circulaire obtenue lorsqu'un faisceau lumineux passe à travers une ouverture circulaire.  4, record 4, French, - tache%20d%27Airy

Record number: 4, Textual support number: 1 OBS

Source MVISI-F : Le nouveau dictionnaire de la vision par Michel Millodot, Médiacom Vision Éditeur, 1997.  5, record 4, French, - tache%20d%27Airy

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

A unit of illumination equivalent to the illumination of a surface all of which is at a distance of one foot from a point source of light having a luminous intensity of one candela(or formerly one international candle), corresponding to a luminous flux density of one lumen per square foot.  6, record 5, English, - foot%2Dcandle

Record number: 5, Textual support number: 1 OBS

A foot-candle (sometimes foot candle; abbreviated fc, lm/ft², or sometimes ft-c) is a non-SI unit of illuminance or light intensity widely used in photography, film, television, and the lighting industry.  4, record 5, English, - foot%2Dcandle

Record number: 5, Textual support number: 2 OBS

A footcandle ... is equal to approximately 10,7639 lux.  3, record 5, English, - foot%2Dcandle

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 DEF

Unité anglo-saxonne d'éclairement d'une surface d'un pied carré sur laquelle est réparti uniformément un flux lumineux ou un lumen.  4, record 5, French, - pied%2Dbougie

Record number: 5, Textual support number: 1 CONT

L'intensité lumineuse est une mesure de la quantité de lumière qui frappe une surface. Elle s'exprime en pieds-bougies. Un pied-bougie correspond à 1 lumen tombant sur une surface de 1 pied carré. L'équivalent métrique d'un pied-bougie est le lux (lumen par mètre carré). 1 pied-bougie = 10,76 lux.  1, record 5, French, - pied%2Dbougie

Record number: 5, Textual support number: 2 CONT

En unités impériales, on mesure le niveau d'éclairement en pieds-bougies (fc) : 1 fc = 1 lm/ft². La relation entre le pied-bougie et le lux est de : 1 fc = 10,76 lx. Il se trouve qu'elle est identique à la relation entre les mètres carrés et les pieds carrés : 1 m² = 10.76 pi².  2, record 5, French, - pied%2Dbougie

Record number: 5, Textual support number: 1 OBS

pluriel : pieds-bougies  5, record 5, French, - pied%2Dbougie

Record number: 5, Textual support number: 2 OBS

bougie : unité de luminescence.  6, record 5, French, - pied%2Dbougie

Record number: 5, Textual support number: 3 OBS

Le mot «bougie» tend à remplacer «chandelle» qui est vieilli en ce sens.  7, record 5, French, - pied%2Dbougie

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 DEF

The part of a gravity wave or ripple on a liquid that is the lowest part of the oscillating surface at any given instant.  2, record 6, English, - trough

Record number: 6, Textual support number: 1 CONT

Double-slit interference.... Young's experiment.... To explain the pattern of Figure 30. 2b, we accept the tentative hypothesis that light is a wave motion and that Huygens’ principle is applicable. Then we can understand the origin of the bright and dark lines by the following reasoning : A wave front from S reaches slits A and B. Each point on this wave front acts as a new source of Huygens’ wavelets. Since A and B are equidistant from S, the Huygens’ sources at A and B both send out crests at the same time, and half a cycle later both send out troughs. The waves from A and B arrive at the screen DF in such a way that at some points crests meet crests(Fig. 30. 2) and troughs meet troughs, thereby giving constructive interference and a bright line. At other points the troughs meet crests and crests meet troughs, resulting in destructive interference or darkness. The bright and dark bands on the screen are called interference fringes.  3, record 6, English, - trough

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 CONT

Expérience d'Young. [interférences lumineuses] [...] Si, pour chacun des points des fentes, on utilise le principe d'Huygens, on obtient la figure 34.6a. Dans cette figure, nous avons indiqué le minimum de chaque onde par une ligne brisée, et le maximum de chaque onde par une ligne pleine, comme nous l'avions fait dans la figure 27.5. Les deux ondes se superposent et on note les faits suivants : a) Le long de certaines lignes, le maximum d'une onde coïncide toujours avec le minimum de l'autre. En tout point de ces lignes, indiquées par une croix sur la figure 34.6a, les deux ondes s'annulent; il n'y a aucune lumière sur l'écran vis-à-vis ces lignes.  1, record 6, French, - minimum

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 CONT

The refractory photocell uses a beam of light that passes through a small chamber at a point away from the light source. Normally, the light does not strike the photocell, and no current is produced. This allows the switch to remain open. When smoke enters the chamber, it causes the light beam to be refracted... in all directions. A portion of the scattered light strikes the photocell causing the current to flow.  1, record 7, English, - refractory%20photocell

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 CONT

Dans le cas de la photocellule à réfraction, le faisceau lumineux traverse une petite chambre à un point à l'écart de la source de lumière. En règle générale, la lumière ne touche pas la photocellule et aucun courant n'est produit. En l'absence de courant, l'interrupteur demeure ouvert. La présence de fumée dans la chambre provoque la réfraction (dispersion)du faisceau lumineux dont une partie atteint la photocellule. Le courant ainsi produit provoque la fermeture de l'interrupteur et déclenche le signal d'alarme [...]  1, record 7, French, - photocellule%20%C3%A0%20r%C3%A9fraction

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 DEF

Scattering of light rays as opposed to the regular radiation of light from a point source.  3, record 8, English, - light%20diffusion

Record number: 8, Textual support number: 1 OBS

Diffusion may be introduced by reflection from a matte surface, by transmission through a frosted or opal glass, or by other means. When diffusion is complete, a sharp image of the light source can no longer be seen and is replaced by a uniform expanded source that emits light equally in all directions.  3, record 8, English, - light%20diffusion

Record 8,  Textual support,  French

Record number: 8, Textual support number: 1 DEF

Dissémination de la lumière traversant un milieu hétérogène ou réflexion irrégulière par une surface mate telle qu'un verre opalin.  3, record 8, French, - diffusion%20de%20la%20lumi%C3%A8re

Record 8,  Textual support,  Spanish

Record 9,  Textual support,  English

Record number: 9, Textual support number: 1 DEF

"cosine law": either of two laws of radiation: a: the radiant flux emitted in a given direction from a given small area of a perfectly diffusing surface varies as the cosine of the angle of emission. b: the irradiation by parallel rays falling on a surface varies as the cosine of the angle of incidence.  1, record 9, English, - cosine%20law

Record number: 9, Textual support number: 1 CONT

The reflection of point sources of light by matte, or diffuse, surfaces(those that scatter light equally in all directions) is modeled by Lambert's cosine law which states that intensity varies as the cosine of the angle between the direction of the light source and a vector perpendicular to the surface, called the surface normal.  5, record 9, English, - cosine%20law

Record number: 9, Textual support number: 2 CONT

"cosine emission law" [states that] the energy emitted by a radiating surface in any direction is proportional to the cosine of the angle which that direction makes with the normal.  4, record 9, English, - cosine%20law

Record 9,  Textual support,  French

Record number: 9, Textual support number: 1 OBS

Nous n'avons pu l'attester dans les ouvrages généraux et spécialisés de langue française que nous possédons.  3, record 9, French, - loi%20de%20Lambert

Record 9,  Textual support,  Spanish

Record 10,  Textual support,  English

Record number: 10, Textual support number: 1 CONT

Achromatic point : In accepted colorimetric sense :... For surface colours the light source serving as illuminant is taken as achromatic.  1, record 10, English, - achromatic%20point

Record 10,  Textual support,  French

Record number: 10, Textual support number: 1 DEF

Dans un système trichromatique de référence donné, point de couleur du stimulus achromatique spécifié. [Définition normalisée par l'AFNOR.]  1, record 10, French, - point%20achromatique

Record number: 10, Textual support number: 1 OBS

point achromatique : terme normalisé par l'AFNOR.  2, record 10, French, - point%20achromatique

Record 10,  Textual support,  Spanish

Record 11,  Textual support,  English

Record number: 11, Textual support number: 1 CONT

The most computationally complex and most realistic algorithms for dealing with both reflection and refraction are called ray-tracing algorithms. In essence they trace individual light rays to determine which of them end up at the viewpoint and how they got there. In order to avoid having to deal with an infinity of lines emanating from a point source, the process works backward, starting at each pixel. Each ray starting at the viewpoint and passing through a pixel is projected backward until it hits a surface. The backward tracing of the reflected ray then continues to determine whether it could have come from a light source or from reflection from another object.  1, record 11, English, - ray%2Dtracing%20algorithm

Record 11,  Textual support,  French

Record 11,  Textual support,  Spanish

Record 12,  Textual support,  English

Record number: 12, Textual support number: 1 DEF

a special, high-intensity point source lamp frequently used because of its low emanation of long(heat) wavelength light and its concentrated source.  1, record 12, English, - zirconium%20lamp

Record 12,  Textual support,  French

Record number: 12, Textual support number: 1 DEF

lampe spéciale de haute intensité lumineuse mais émettant relativement peu de chaleur.  1, record 12, French, - lampe%20au%20zirconium

Record 12,  Textual support,  Spanish

Record 13,  Textual support,  French

Record 13,  Textual support,  Spanish