TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

LOI LAMBERT [3 records]

Record 1 1998-09-09

English

Subject field(s)
  • Analytical Chemistry
  • Optics
  • Computer Mathematics
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.

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.

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.

French

Domaine(s)
  • Chimie analytique
  • Optique
  • Mathématiques informatiques
OBS

Nous n'avons pu l'attester dans les ouvrages généraux et spécialisés de langue française que nous possédons.

Spanish

Save record 1

Record 2 1989-02-28

English

Subject field(s)
  • Analytical Chemistry
  • Optics
DEF

"Bouguer law": The law discovered by Bouguer in 1729, that the absorption of light in homogeneous materials depends on thickness according to the exponential expression given under absorption coefficient.

OBS

The law was rediscovered by Lambert and is often referred to as the Lambert law of absorption. It is also related to the Beer law, which is obtained by setting the absorption coefficient a = a[alpha]c. When the law is expressed in terms of common logarithms: I = I010- kx, "k" is known as the extinction coefficient. These laws may be applied to a narrow band of wavelengths, giving the specular coefficient of absorption or the specular extinction coefficient according to the form of the equation used.

French

Domaine(s)
  • Chimie analytique
  • Optique
DEF

"loi de Bouguer" : Loi exprimant l'absorption exponentielle de la lumière par une substance colorée; reprise par Lambert et Beer.

Spanish

Save record 2

Record 3 1976-06-19

English

Subject field(s)
  • Commercial Fishing

French

Domaine(s)
  • Pêche commerciale
OBS

(pêche)

Spanish

Save record 3

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