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FREQUENCY PLANE [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-02-24

English

Subject field(s)
  • Photoelectricity and Electron Optics
  • Lasers and Masers
  • Thermonuclear fusion
  • Plasma Physics
CONT

The time variation of the focal plane speckle is achieved by a process known as smoothing by spectral dispersion(SSD). In SSD, a small amount of frequency modulated(FM) bandwidth is added to the laser, and this is angularly dispersed using a diffraction grating in the front end.

Key term(s)
  • spectral dispersion smoothing

French

Domaine(s)
  • Photo-électricité et optique électronique
  • Masers et lasers
  • Fusion thermonucléaire
  • Physique des plasmas
DEF

Lissage optique qui consiste à élargir le spectre du rayonnement laser, puis à focaliser chaque composante de ce spectre sur un point différent de la surface du microballon de fusion inertielle ou sur l'entrée de la cavité radiative d'attaque indirecte.

OBS

lissage par dispersion spectrale; LDS : désignations et définition publiées au Journal officiel de la République française le 2 février 2023.

Spanish

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Record 2 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.92 (19762)
ISO/IEC standard entry number
DEF

polarization of a propagating wave is determined by the locus or path described by the electric field vector with respect to time

OBS

Polarization is a term that often arises in the literature and when considering radio frequency communication and RFID. If we ascribe an x, y, z co-ordinate system to a propagating wave as illustrated below, with the direction of propagation being in the z direction, the electric field vector E will be in the x, y plane. If E remains in the same orientation with respect to time, so that its locus describes a straight line, the wave is said to be linearly polarized. However, if the locus describes a circular motion with respect to time the wave is said to be circularly polarized. Where the locus describes an elliptical path, the wave is said to be elliptically polarized.

OBS

Circular polarization is often used in communication systems since the orientation of the transmitting and receiving antenna is less important than it is with linearly polarized waves. The magnetic vector, H, always remains perpendicular to the E vector. Using an IEEE convention, a clockwise circular rotating wavefront approaching a receiver is defined as being left-hand circular (LHC) polarized. The power in the wavefront is expressed in the form of the Poynting vector, P: P = (E x H) = E x H sin ..., where ... is the phase angle between E and H.

OBS

polarization summary: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

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Record 3 2007-01-15

English

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

Coincidence effect. When a plane wave strikes a thin partition at an angle, there are alternating high and low pressure zones along the partition that cause it to flex sinusoidally. This flexural wave propagates along the surface of the wall. At some frequency, there is a kind of resonance and the wall becomes transparent to the wave. This causes a marked decrease in the transmission loss over what is expected from the mass law; it can be 10-15 dB.

French

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

Quand une onde rencontre une paroi avec une [...] incidence oblique et une fréquence particulière, la paroi vibre et se déforme en flexion. Si la célérité des ondes de torsion de la paroi rejoint la célérité du son dans l'air, il se produit une perte d'isolement. Le phénomène n'est pas confiné à une seule fréquence. Au delà de la fréquence critique, les pertes d'isolement sont essentiellement liées à l'effet de coïncidence.

Spanish

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Record 4 1986-12-15

English

Subject field(s)
  • Nuclear Medicine
OBS

According to a theorem of Larmor... the magnetization M precesses around the field in such a way that [its magnitude] is constant. M describes a cone with a constant angle... ;M and thus its projection on the transverse(x, y) plane precess around the magnetic field with the so-called Larmor frequency....

French

Domaine(s)
  • Médecine nucléaire
CONT

Au repos, la toupie et donc l'aiguille aimantée, se trouvent alignées avec le champ B (zéro en indice inférieur). Si nous écartons l'axe de la toupie de celui (de ce champ), la toupie entame autour de l'axe (de ce champ) un mouvement de rotation, appelé précession de Larmor (B).

Spanish

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