TERMIUM Plus®

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

ACOUSTIC SHADOW [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2019-07-08

English

Subject field(s)
  • Ultrasonography
CONT

If the sound encounters air or bone ... the impedance mismatch is so great that almost all of the acoustic energy is reflected and nearly none is transmitted. This creates an acoustic shadow that obscures structures located deep to the air or bone.

French

Domaine(s)
  • Ultrasonographie
CONT

[...] les cônes d'ombre apparaissent quand les ultrasons rencontrent une structure plus atténuante que les structures voisines; dans ce cas (os, calcifications, air), il n'y a plus d'échos émis en arrière de la structure, d'où la présence d'une zone anéchogène [...]

Spanish

Campo(s) temático(s)
  • Ecografía
Save record 1

Record 2 1986-05-15

English

Subject field(s)
  • Building Insulation and Acoustical Design
  • Acoustics (Physics)
DEF

A region immediately behind an object placed in the path of a sound wave whose wavelength is much smaller than the object, in which the initial sound wave is cut off by the object and the sound intensity is determined by the diffraction and interference of sound waves bent around the obstacle.

French

Domaine(s)
  • Isolation et acoustique architecturale
  • Acoustique (Physique)
CONT

Lorsqu'un son frappe une surface et qu'il se réfléchit, il se produit (...) un phénomène d'écho. (...) De l'autre côté de la surface réfléchissante, il peut se produire une véritable "ombre" acoustique; un auditeur qui se trouve séparé d'une source sonore par un obstacle peut donc ne pas entendre cette source si l'obstacle est assez grand (...)

CONT

(...) les méthodes de tracés de rayons acoustiques (...) permettraient d'appréhender la distribution de l'énergie sonore dans les salles et ainsi d'éviter l'existence de zones de focalisation, d'ombres acoustiques ou d'échos multiples (...)

Spanish

Save record 2

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