TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 DEF

The phenomenon exhibited by laser gyros that is characterized by frequency locking of the clockwise and counterclockwise beams at low input rates.  3, fiche 1, Anglais, - lock%2Din

Record number: 1, Textual support number: 1 CONT

Lock-in is a fundamental physical phenomenon associated with all oscillating devices. Laser gyros exhibit the same phenomenon, in that the coupling mechanism is the reflection of light from one laser beam back along the path where it interacts with the oppositely traveling beam. This is called backscatter and is caused primarily by imperfect mirrors.  4, fiche 1, Anglais, - lock%2Din

Record number: 1, Textual support number: 1 OBS

[Lock-in] is caused by the coupling of energy between the laser beams and results in a threshold error near zero input angular rate unless a corrective means, such as biasing, is used.  3, fiche 1, Anglais, - lock%2Din

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 CONT

L'origine physique [du] blocage des oscillations [gyromètre laser] tient à ce qu'une partie de chacun des rayonnements se déplaçant dans un sens donné est renvoyée dans l'autre sens; ce renvoi est notamment dû aux irrégularités de surface des miroirs et aux variations d'indice de ces miroirs.  3, fiche 1, Français, - blocage

Record number: 1, Textual support number: 2 CONT

La structure simple du gyrolaser lui confère une excellente fiabilité et une bonne précision [...] Les défauts de surface des miroirs, même infimes, provoquent la rétrodiffusion d'une partie de chaque rayon qui se couple alors avec le rayon se propageant dans l'autre sens. Il se crée ainsi un couplage (lock-in) entre les faisceaux lasers et une zone aveugle pour les vitesses angulaires faibles.  2, fiche 1, Français, - blocage

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

One of the more advanced concepts is the laser/fiber-optics gyro. For this gyro a fiber-optics cable up to 300(100 m) in length is coiled many times around a loop, with both ends brought out to a laser. The laser beam is split into two beams, with the beams directed into the opposite ends of the coiled fiber-optics cable. Upon emerging from the opposite ends, they are recombined at the beam splitter to form interference fringes. Unlike the laser gyro, the coiled fiber is not a part of the resonant cavity and hence does not exhibit the lock-in phenomena; however, a rotation rate causes only a fringe displacement and not an integrating effect as in the laser gyro. The instrument is therefore a rate gyro and not a rate-integrating gyro.  1, fiche 2, Anglais, - coiled%20fiber

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 CONT

Les gaines de protection pour fibre optique (spiralée).  1, fiche 2, Français, - fibre%20optique%20spiral%C3%A9e

Fiche 2,  Justifications,  Espagnol