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LOCK-IN PHENOMENON [1 record]
Record 1 - internal organization data 2011-01-05
Record 1, English
Record 1, Subject field(s)
- Lasers and Masers
- Optics
- Navigation Instruments
Record 1, Main entry term, English
- lock-in
1, record 1, English, lock%2Din
correct, noun
Record 1, Abbreviations, English
Record 1, Synonyms, English
- lock-in phenomenon 2, record 1, English, lock%2Din%20phenomenon
correct
Record 1, Textual support, English
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, record 1, English, - 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, record 1, English, - 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, record 1, English, - lock%2Din
Record 1, Key term(s)
- lock-in phenomena
Record 1, French
Record 1, Domaine(s)
- Masers et lasers
- Optique
- Instruments de navigation
Record 1, Main entry term, French
- blocage
1, record 1, French, blocage
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- couplage 2, record 1, French, couplage
correct, masculine noun
Record 1, Textual support, French
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, record 1, French, - 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, record 1, French, - blocage
Record 1, Key term(s)
- blocage des oscillations
Record 1, Spanish
Record 1, Textual support, Spanish
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